java/17 : jdk.jdi/com/sun/tools/jdi/JDWP.java

JDWP
https://openjdk.java.net/
GPLv2 + Classpath Exception
package com.sun.tools.jdi;

import com.sun.jdi.*;
import java.util.*;


Java(tm) Debug Wire Protocol
/**
 * Java(tm) Debug Wire Protocol
 */
class JDWP {

    static class VirtualMachine {
        static final int COMMAND_SET = 1;
        private VirtualMachine() {}  // hide constructor

        Returns the JDWP version implemented by the target VM. 
The version string format is implementation dependent. 
/**
         * Returns the JDWP version implemented by the target VM. 
         * The version string format is implementation dependent. 
         */
        static class Version {
            static final int COMMAND = 1;

            static Version process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Version"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static Version waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Version(vm, ps);
            }


            Text information on the VM version
/**
             * Text information on the VM version
             */
            final String description;

            Major JDWP Version number
/**
             * Major JDWP Version number
             */
            final int jdwpMajor;

            Minor JDWP Version number
/**
             * Minor JDWP Version number
             */
            final int jdwpMinor;

            Target VM JRE version, as in the java.version property
/**
             * Target VM JRE version, as in the java.version property
             */
            final String vmVersion;

            Target VM name, as in the java.vm.name property
/**
             * Target VM name, as in the java.vm.name property
             */
            final String vmName;

            private Version(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Version"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                description = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "description(String): " + description);
                }
                jdwpMajor = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "jdwpMajor(int): " + jdwpMajor);
                }
                jdwpMinor = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "jdwpMinor(int): " + jdwpMinor);
                }
                vmVersion = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "vmVersion(String): " + vmVersion);
                }
                vmName = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "vmName(String): " + vmName);
                }
            }
        }

        Returns reference types for all the classes loaded by the target VM 
which match the given signature. 
Multple reference types will be returned if two or more class 
loaders have loaded a class of the same name. 
The search is confined to loaded classes only; no attempt is made 
to load a class of the given signature. 
/**
         * Returns reference types for all the classes loaded by the target VM 
         * which match the given signature. 
         * Multple reference types will be returned if two or more class 
         * loaders have loaded a class of the same name. 
         * The search is confined to loaded classes only; no attempt is made 
         * to load a class of the given signature. 
         */
        static class ClassesBySignature {
            static final int COMMAND = 2;

            static ClassesBySignature process(VirtualMachineImpl vm, 
                                String signature)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, signature);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                String signature) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.ClassesBySignature"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 signature(String): " + signature);
                }
                ps.writeString(signature);
                ps.send();
                return ps;
            }

            static ClassesBySignature waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClassesBySignature(vm, ps);
            }

            static class ClassInfo {

                Kind 
of following reference type. 
/**
                 * <a href="#JDWP_TypeTag">Kind</a> 
                 * of following reference type. 
                 */
                final byte refTypeTag;

                Matching loaded reference type
/**
                 * Matching loaded reference type
                 */
                final long typeID;

                The current class 
status. 
/**
                 * The current class 
                 * <a href="#JDWP_ClassStatus">status.</a> 
                 */
                final int status;

                private ClassInfo(VirtualMachineImpl vm, PacketStream ps) {
                    refTypeTag = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "refTypeTag(byte): " + refTypeTag);
                    }
                    typeID = ps.readClassRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "typeID(long): " + "ref="+typeID);
                    }
                    status = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "status(int): " + status);
                    }
                }
            }


            Number of reference types that follow.
/**
             * Number of reference types that follow.
             */
            final ClassInfo[] classes;

            private ClassesBySignature(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.ClassesBySignature"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classes(ClassInfo[]): " + "");
                }
                int classesCount = ps.readInt();
                classes = new ClassInfo[classesCount];
                for (int i = 0; i < classesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "classes[i](ClassInfo): " + "");
                    }
                    classes[i] = new ClassInfo(vm, ps);
                }
            }
        }

        Returns reference types for all classes currently loaded by the 
target VM. 
See JVM TI GetLoadedClasses.
/**
         * Returns reference types for all classes currently loaded by the 
         * target VM. 
         * See <a href="../jvmti.html#GetLoadedClasses">JVM TI GetLoadedClasses</a>.
         */
        static class AllClasses {
            static final int COMMAND = 3;

            static AllClasses process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllClasses"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static AllClasses waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new AllClasses(vm, ps);
            }

            static class ClassInfo {

                Kind 
of following reference type. 
/**
                 * <a href="#JDWP_TypeTag">Kind</a> 
                 * of following reference type. 
                 */
                final byte refTypeTag;

                Loaded reference type
/**
                 * Loaded reference type
                 */
                final long typeID;

                The JNI signature of the loaded reference type
/**
                 * The JNI signature of the loaded reference type
                 */
                final String signature;

                The current class 
status. 
/**
                 * The current class 
                 * <a href="#JDWP_ClassStatus">status.</a> 
                 */
                final int status;

                private ClassInfo(VirtualMachineImpl vm, PacketStream ps) {
                    refTypeTag = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "refTypeTag(byte): " + refTypeTag);
                    }
                    typeID = ps.readClassRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "typeID(long): " + "ref="+typeID);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    status = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "status(int): " + status);
                    }
                }
            }


            Number of reference types that follow.
/**
             * Number of reference types that follow.
             */
            final ClassInfo[] classes;

            private AllClasses(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllClasses"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classes(ClassInfo[]): " + "");
                }
                int classesCount = ps.readInt();
                classes = new ClassInfo[classesCount];
                for (int i = 0; i < classesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "classes[i](ClassInfo): " + "");
                    }
                    classes[i] = new ClassInfo(vm, ps);
                }
            }
        }

        Returns all threads currently running in the target VM . 
The returned list contains threads created through 
java.lang.Thread, all native threads attached to 
the target VM through JNI, and system threads created 
by the target VM. Threads that have not yet been started 
and threads that have completed their execution are not 
included in the returned list. 
/**
         * Returns all threads currently running in the target VM . 
         * The returned list contains threads created through 
         * java.lang.Thread, all native threads attached to 
         * the target VM through JNI, and system threads created 
         * by the target VM. Threads that have not yet been started 
         * and threads that have completed their execution are not 
         * included in the returned list. 
         */
        static class AllThreads {
            static final int COMMAND = 4;

            static AllThreads process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllThreads"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static AllThreads waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new AllThreads(vm, ps);
            }


            Number of threads that follow.
/**
             * Number of threads that follow.
             */
            final ThreadReferenceImpl[] threads;

            private AllThreads(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllThreads"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "threads(ThreadReferenceImpl[]): " + "");
                }
                int threadsCount = ps.readInt();
                threads = new ThreadReferenceImpl[threadsCount];
                for (int i = 0; i < threadsCount; i++) {;
                    threads[i] = ps.readThreadReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "threads[i](ThreadReferenceImpl): " + (threads[i]==null?"NULL":"ref="+threads[i].ref()));
                    }
                }
            }
        }

        Returns all thread groups that do not have a parent. This command 
may be used as the first step in building a tree (or trees) of the 
existing thread groups.
/**
         * Returns all thread groups that do not have a parent. This command 
         * may be used as the first step in building a tree (or trees) of the 
         * existing thread groups.
         */
        static class TopLevelThreadGroups {
            static final int COMMAND = 5;

            static TopLevelThreadGroups process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.TopLevelThreadGroups"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static TopLevelThreadGroups waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new TopLevelThreadGroups(vm, ps);
            }


            Number of thread groups that follow.
/**
             * Number of thread groups that follow.
             */
            final ThreadGroupReferenceImpl[] groups;

            private TopLevelThreadGroups(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.TopLevelThreadGroups"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "groups(ThreadGroupReferenceImpl[]): " + "");
                }
                int groupsCount = ps.readInt();
                groups = new ThreadGroupReferenceImpl[groupsCount];
                for (int i = 0; i < groupsCount; i++) {;
                    groups[i] = ps.readThreadGroupReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "groups[i](ThreadGroupReferenceImpl): " + (groups[i]==null?"NULL":"ref="+groups[i].ref()));
                    }
                }
            }
        }

        Invalidates this virtual machine mirror. 
The communication channel to the target VM is closed, and 
the target VM prepares to accept another subsequent connection 
from this debugger or another debugger, including the 
following tasks: 

All event requests are cancelled. 
All threads suspended by the thread-level 
resume command 
or the VM-level 
resume command 
are resumed as many times as necessary for them to run. 
Garbage collection is re-enabled in all cases where it was 
disabled 

Any current method invocations executing in the target VM 
are continued after the disconnection. Upon completion of any such 
method invocation, the invoking thread continues from the 
location where it was originally stopped. 

Resources originating in  
this VirtualMachine (ObjectReferences, ReferenceTypes, etc.) 
will become invalid. 
/**
         * Invalidates this virtual machine mirror. 
         * The communication channel to the target VM is closed, and 
         * the target VM prepares to accept another subsequent connection 
         * from this debugger or another debugger, including the 
         * following tasks: 
         * <ul>
         * <li>All event requests are cancelled. 
         * <li>All threads suspended by the thread-level 
         * <a href="#JDWP_ThreadReference_Resume">resume</a> command 
         * or the VM-level 
         * <a href="#JDWP_VirtualMachine_Resume">resume</a> command 
         * are resumed as many times as necessary for them to run. 
         * <li>Garbage collection is re-enabled in all cases where it was 
         * <a href="#JDWP_ObjectReference_DisableCollection">disabled</a> 
         * </ul>
         * Any current method invocations executing in the target VM 
         * are continued after the disconnection. Upon completion of any such 
         * method invocation, the invoking thread continues from the 
         * location where it was originally stopped. 
         * <p>
         * Resources originating in  
         * this VirtualMachine (ObjectReferences, ReferenceTypes, etc.) 
         * will become invalid. 
         */
        static class Dispose {
            static final int COMMAND = 6;

            static Dispose process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Dispose"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static Dispose waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Dispose(vm, ps);
            }


            private Dispose(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Dispose"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Returns the sizes of variably-sized data types in the target VM.
The returned values indicate the number of bytes used by the 
identifiers in command and reply packets.
/**
         * Returns the sizes of variably-sized data types in the target VM.
         * The returned values indicate the number of bytes used by the 
         * identifiers in command and reply packets.
         */
        static class IDSizes {
            static final int COMMAND = 7;

            static IDSizes process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.IDSizes"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static IDSizes waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new IDSizes(vm, ps);
            }


            fieldID size in bytes 
/**
             * fieldID size in bytes 
             */
            final int fieldIDSize;

            methodID size in bytes 
/**
             * methodID size in bytes 
             */
            final int methodIDSize;

            objectID size in bytes 
/**
             * objectID size in bytes 
             */
            final int objectIDSize;

            referenceTypeID size in bytes 
/**
             * referenceTypeID size in bytes 
             */
            final int referenceTypeIDSize;

            frameID size in bytes 
/**
             * frameID size in bytes 
             */
            final int frameIDSize;

            private IDSizes(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.IDSizes"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                fieldIDSize = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "fieldIDSize(int): " + fieldIDSize);
                }
                methodIDSize = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "methodIDSize(int): " + methodIDSize);
                }
                objectIDSize = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "objectIDSize(int): " + objectIDSize);
                }
                referenceTypeIDSize = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "referenceTypeIDSize(int): " + referenceTypeIDSize);
                }
                frameIDSize = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "frameIDSize(int): " + frameIDSize);
                }
            }
        }

        Suspends the execution of the application running in the target 
VM. All Java threads currently running will be suspended. 

Unlike java.lang.Thread.suspend, 
suspends of both the virtual machine and individual threads are 
counted. Before a thread will run again, it must be resumed through 
the VM-level resume command 
or the thread-level resume command 
the same number of times it has been suspended. 
/**
         * Suspends the execution of the application running in the target 
         * VM. All Java threads currently running will be suspended. 
         * <p>
         * Unlike java.lang.Thread.suspend, 
         * suspends of both the virtual machine and individual threads are 
         * counted. Before a thread will run again, it must be resumed through 
         * the <a href="#JDWP_VirtualMachine_Resume">VM-level resume</a> command 
         * or the <a href="#JDWP_ThreadReference_Resume">thread-level resume</a> command 
         * the same number of times it has been suspended. 
         */
        static class Suspend {
            static final int COMMAND = 8;

            static Suspend process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Suspend"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static Suspend waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Suspend(vm, ps);
            }


            private Suspend(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Suspend"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Resumes execution of the application after the suspend 
command or an event has stopped it. 
Suspensions of the Virtual Machine and individual threads are 
counted. If a particular thread is suspended n times, it must 
resumed n times before it will continue. 
/**
         * Resumes execution of the application after the suspend 
         * command or an event has stopped it. 
         * Suspensions of the Virtual Machine and individual threads are 
         * counted. If a particular thread is suspended n times, it must 
         * resumed n times before it will continue. 
         */
        static class Resume {
            static final int COMMAND = 9;

            static Resume process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Resume"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static Resume waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Resume(vm, ps);
            }


            private Resume(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Resume"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Terminates the target VM with the given exit code. 
On some platforms, the exit code might be truncated, for 
example, to the low order 8 bits. 
All ids previously returned from the target VM become invalid. 
Threads running in the VM are abruptly terminated. 
A thread death exception is not thrown and 
finally blocks are not run.
/**
         * Terminates the target VM with the given exit code. 
         * On some platforms, the exit code might be truncated, for 
         * example, to the low order 8 bits. 
         * All ids previously returned from the target VM become invalid. 
         * Threads running in the VM are abruptly terminated. 
         * A thread death exception is not thrown and 
         * finally blocks are not run.
         */
        static class Exit {
            static final int COMMAND = 10;

            static Exit process(VirtualMachineImpl vm, 
                                int exitCode)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, exitCode);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                int exitCode) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Exit"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 exitCode(int): " + exitCode);
                }
                ps.writeInt(exitCode);
                ps.send();
                return ps;
            }

            static Exit waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Exit(vm, ps);
            }


            private Exit(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Exit"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Creates a new string object in the target VM and returns 
its id. 
/**
         * Creates a new string object in the target VM and returns 
         * its id. 
         */
        static class CreateString {
            static final int COMMAND = 11;

            static CreateString process(VirtualMachineImpl vm, 
                                String utf)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, utf);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                String utf) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.CreateString"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 utf(String): " + utf);
                }
                ps.writeString(utf);
                ps.send();
                return ps;
            }

            static CreateString waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new CreateString(vm, ps);
            }


            Created string (instance of java.lang.String) 
/**
             * Created string (instance of java.lang.String) 
             */
            final StringReferenceImpl stringObject;

            private CreateString(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.CreateString"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                stringObject = ps.readStringReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "stringObject(StringReferenceImpl): " + (stringObject==null?"NULL":"ref="+stringObject.ref()));
                }
            }
        }

        Retrieve this VM's capabilities. The capabilities are returned 
as booleans, each indicating the presence or absence of a 
capability. The commands associated with each capability will 
return the NOT_IMPLEMENTED error if the cabability is not 
available.
/**
         * Retrieve this VM's capabilities. The capabilities are returned 
         * as booleans, each indicating the presence or absence of a 
         * capability. The commands associated with each capability will 
         * return the NOT_IMPLEMENTED error if the cabability is not 
         * available.
         */
        static class Capabilities {
            static final int COMMAND = 12;

            static Capabilities process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Capabilities"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static Capabilities waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Capabilities(vm, ps);
            }


            Can the VM watch field modification, and therefore 
can it send the Modification Watchpoint Event?
/**
             * Can the VM watch field modification, and therefore 
             * can it send the Modification Watchpoint Event?
             */
            final boolean canWatchFieldModification;

            Can the VM watch field access, and therefore 
can it send the Access Watchpoint Event?
/**
             * Can the VM watch field access, and therefore 
             * can it send the Access Watchpoint Event?
             */
            final boolean canWatchFieldAccess;

            Can the VM get the bytecodes of a given method? 
/**
             * Can the VM get the bytecodes of a given method? 
             */
            final boolean canGetBytecodes;

            Can the VM determine whether a field or method is 
synthetic? (that is, can the VM determine if the 
method or the field was invented by the compiler?) 
/**
             * Can the VM determine whether a field or method is 
             * synthetic? (that is, can the VM determine if the 
             * method or the field was invented by the compiler?) 
             */
            final boolean canGetSyntheticAttribute;

            Can the VM get the owned monitors infornation for 
a thread?
/**
             * Can the VM get the owned monitors infornation for 
             * a thread?
             */
            final boolean canGetOwnedMonitorInfo;

            Can the VM get the current contended monitor of a thread?
/**
             * Can the VM get the current contended monitor of a thread?
             */
            final boolean canGetCurrentContendedMonitor;

            Can the VM get the monitor information for a given object? 
/**
             * Can the VM get the monitor information for a given object? 
             */
            final boolean canGetMonitorInfo;

            private Capabilities(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.Capabilities"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                canWatchFieldModification = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canWatchFieldModification(boolean): " + canWatchFieldModification);
                }
                canWatchFieldAccess = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canWatchFieldAccess(boolean): " + canWatchFieldAccess);
                }
                canGetBytecodes = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetBytecodes(boolean): " + canGetBytecodes);
                }
                canGetSyntheticAttribute = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetSyntheticAttribute(boolean): " + canGetSyntheticAttribute);
                }
                canGetOwnedMonitorInfo = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetOwnedMonitorInfo(boolean): " + canGetOwnedMonitorInfo);
                }
                canGetCurrentContendedMonitor = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetCurrentContendedMonitor(boolean): " + canGetCurrentContendedMonitor);
                }
                canGetMonitorInfo = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetMonitorInfo(boolean): " + canGetMonitorInfo);
                }
            }
        }

        Retrieve the classpath and bootclasspath of the target VM. 
If the classpath is not defined, returns an empty list. If the 
bootclasspath is not defined returns an empty list.
/**
         * Retrieve the classpath and bootclasspath of the target VM. 
         * If the classpath is not defined, returns an empty list. If the 
         * bootclasspath is not defined returns an empty list.
         */
        static class ClassPaths {
            static final int COMMAND = 13;

            static ClassPaths process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.ClassPaths"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static ClassPaths waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClassPaths(vm, ps);
            }


            Base directory used to resolve relative 
paths in either of the following lists.
/**
             * Base directory used to resolve relative 
             * paths in either of the following lists.
             */
            final String baseDir;

            Number of paths in classpath.
/**
             * Number of paths in classpath.
             */
            final String[] classpaths;

            Number of paths in bootclasspath.
/**
             * Number of paths in bootclasspath.
             */
            final String[] bootclasspaths;

            private ClassPaths(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.ClassPaths"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                baseDir = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "baseDir(String): " + baseDir);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classpaths(String[]): " + "");
                }
                int classpathsCount = ps.readInt();
                classpaths = new String[classpathsCount];
                for (int i = 0; i < classpathsCount; i++) {;
                    classpaths[i] = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "classpaths[i](String): " + classpaths[i]);
                    }
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "bootclasspaths(String[]): " + "");
                }
                int bootclasspathsCount = ps.readInt();
                bootclasspaths = new String[bootclasspathsCount];
                for (int i = 0; i < bootclasspathsCount; i++) {;
                    bootclasspaths[i] = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "bootclasspaths[i](String): " + bootclasspaths[i]);
                    }
                }
            }
        }

        Releases a list of object IDs. For each object in the list, the 
following applies. 
The count of references held by the back-end (the reference 
count) will be decremented by refCnt. 
If thereafter the reference count is less than 
or equal to zero, the ID is freed. 
Any back-end resources associated with the freed ID may 
be freed, and if garbage collection was 
disabled for the object, it will be re-enabled. 
The sender of this command 
promises that no further commands will be sent 
referencing a freed ID.

Use of this command is not required. If it is not sent, 
resources associated with each ID will be freed by the back-end 
at some time after the corresponding object is garbage collected. 
It is most useful to use this command to reduce the load on the 
back-end if a very large number of 
objects has been retrieved from the back-end (a large array, 
for example) but may not be garbage collected any time soon. 

IDs may be re-used by the back-end after they 
have been freed with this command.
This description assumes reference counting, 
a back-end may use any implementation which operates 
equivalently. 
/**
         * Releases a list of object IDs. For each object in the list, the 
         * following applies. 
         * The count of references held by the back-end (the reference 
         * count) will be decremented by refCnt. 
         * If thereafter the reference count is less than 
         * or equal to zero, the ID is freed. 
         * Any back-end resources associated with the freed ID may 
         * be freed, and if garbage collection was 
         * disabled for the object, it will be re-enabled. 
         * The sender of this command 
         * promises that no further commands will be sent 
         * referencing a freed ID.
         * <p>
         * Use of this command is not required. If it is not sent, 
         * resources associated with each ID will be freed by the back-end 
         * at some time after the corresponding object is garbage collected. 
         * It is most useful to use this command to reduce the load on the 
         * back-end if a very large number of 
         * objects has been retrieved from the back-end (a large array, 
         * for example) but may not be garbage collected any time soon. 
         * <p>
         * IDs may be re-used by the back-end after they 
         * have been freed with this command.
         * This description assumes reference counting, 
         * a back-end may use any implementation which operates 
         * equivalently. 
         */
        static class DisposeObjects {
            static final int COMMAND = 14;

            static class Request {

                The object ID
/**
                 * The object ID
                 */
                final ObjectReferenceImpl object;

                The number of times this object ID has been 
part of a packet received from the back-end. 
An accurate count prevents the object ID 
from being freed on the back-end if 
it is part of an incoming packet, not yet 
handled by the front-end.
/**
                 * The number of times this object ID has been 
                 * part of a packet received from the back-end. 
                 * An accurate count prevents the object ID 
                 * from being freed on the back-end if 
                 * it is part of an incoming packet, not yet 
                 * handled by the front-end.
                 */
                final int refCnt;

                Request(ObjectReferenceImpl object, int refCnt) {
                    this.object = object;
                    this.refCnt = refCnt;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                    }
                    ps.writeObjectRef(object.ref());
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     refCnt(int): " + refCnt);
                    }
                    ps.writeInt(refCnt);
                }
            }

            static DisposeObjects process(VirtualMachineImpl vm, 
                                Request[] requests)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, requests);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                Request[] requests) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.DisposeObjects"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 requests(Request[]): " + "");
                }
                ps.writeInt(requests.length);
                for (int i = 0; i < requests.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     requests[i](Request): " + "");
                    }
                    requests[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static DisposeObjects waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new DisposeObjects(vm, ps);
            }


            private DisposeObjects(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.DisposeObjects"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Tells the target VM to stop sending events. Events are not discarded; 
they are held until a subsequent ReleaseEvents command is sent. 
This command is useful to control the number of events sent 
to the debugger VM in situations where very large numbers of events 
are generated. 
While events are held by the debugger back-end, application 
execution may be frozen by the debugger back-end to prevent 
buffer overflows on the back end.
Responses to commands are never held and are not affected by this
command. If events are already being held, this command is 
ignored.
/**
         * Tells the target VM to stop sending events. Events are not discarded; 
         * they are held until a subsequent ReleaseEvents command is sent. 
         * This command is useful to control the number of events sent 
         * to the debugger VM in situations where very large numbers of events 
         * are generated. 
         * While events are held by the debugger back-end, application 
         * execution may be frozen by the debugger back-end to prevent 
         * buffer overflows on the back end.
         * Responses to commands are never held and are not affected by this
         * command. If events are already being held, this command is 
         * ignored.
         */
        static class HoldEvents {
            static final int COMMAND = 15;

            static HoldEvents process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.HoldEvents"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static HoldEvents waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new HoldEvents(vm, ps);
            }


            private HoldEvents(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.HoldEvents"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Tells the target VM to continue sending events. This command is 
used to restore normal activity after a HoldEvents command. If 
there is no current HoldEvents command in effect, this command is 
ignored.
/**
         * Tells the target VM to continue sending events. This command is 
         * used to restore normal activity after a HoldEvents command. If 
         * there is no current HoldEvents command in effect, this command is 
         * ignored.
         */
        static class ReleaseEvents {
            static final int COMMAND = 16;

            static ReleaseEvents process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.ReleaseEvents"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static ReleaseEvents waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ReleaseEvents(vm, ps);
            }


            private ReleaseEvents(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.ReleaseEvents"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Retrieve all of this VM's capabilities. The capabilities are returned 
as booleans, each indicating the presence or absence of a 
capability. The commands associated with each capability will 
return the NOT_IMPLEMENTED error if the cabability is not 
available.
Since JDWP version 1.4.
/**
         * Retrieve all of this VM's capabilities. The capabilities are returned 
         * as booleans, each indicating the presence or absence of a 
         * capability. The commands associated with each capability will 
         * return the NOT_IMPLEMENTED error if the cabability is not 
         * available.
         * Since JDWP version 1.4.
         */
        static class CapabilitiesNew {
            static final int COMMAND = 17;

            static CapabilitiesNew process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.CapabilitiesNew"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static CapabilitiesNew waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new CapabilitiesNew(vm, ps);
            }


            Can the VM watch field modification, and therefore 
can it send the Modification Watchpoint Event?
/**
             * Can the VM watch field modification, and therefore 
             * can it send the Modification Watchpoint Event?
             */
            final boolean canWatchFieldModification;

            Can the VM watch field access, and therefore 
can it send the Access Watchpoint Event?
/**
             * Can the VM watch field access, and therefore 
             * can it send the Access Watchpoint Event?
             */
            final boolean canWatchFieldAccess;

            Can the VM get the bytecodes of a given method? 
/**
             * Can the VM get the bytecodes of a given method? 
             */
            final boolean canGetBytecodes;

            Can the VM determine whether a field or method is 
synthetic? (that is, can the VM determine if the 
method or the field was invented by the compiler?) 
/**
             * Can the VM determine whether a field or method is 
             * synthetic? (that is, can the VM determine if the 
             * method or the field was invented by the compiler?) 
             */
            final boolean canGetSyntheticAttribute;

            Can the VM get the owned monitors infornation for 
a thread?
/**
             * Can the VM get the owned monitors infornation for 
             * a thread?
             */
            final boolean canGetOwnedMonitorInfo;

            Can the VM get the current contended monitor of a thread?
/**
             * Can the VM get the current contended monitor of a thread?
             */
            final boolean canGetCurrentContendedMonitor;

            Can the VM get the monitor information for a given object? 
/**
             * Can the VM get the monitor information for a given object? 
             */
            final boolean canGetMonitorInfo;

            Can the VM redefine classes?
/**
             * Can the VM redefine classes?
             */
            final boolean canRedefineClasses;

            Can the VM add methods when redefining classes? 
@Deprecated(since="15") A JVM TI based JDWP back-end 
will never set this capability to true.
/**
             * Can the VM add methods when redefining classes? 
             * <p>@Deprecated(since="15") A JVM TI based JDWP back-end 
             * will never set this capability to true.
             */
            final boolean canAddMethod;

            Can the VM redefine classes 
in ways that are normally restricted?
@Deprecated(since="15") A JVM TI based JDWP back-end 
will never set this capability to true.
/**
             * Can the VM redefine classes 
             * in ways that are normally restricted?
             * <p>@Deprecated(since="15") A JVM TI based JDWP back-end 
             * will never set this capability to true.
             */
            final boolean canUnrestrictedlyRedefineClasses;

            Can the VM pop stack frames?
/**
             * Can the VM pop stack frames?
             */
            final boolean canPopFrames;

            Can the VM filter events by specific object?
/**
             * Can the VM filter events by specific object?
             */
            final boolean canUseInstanceFilters;

            Can the VM get the source debug extension?
/**
             * Can the VM get the source debug extension?
             */
            final boolean canGetSourceDebugExtension;

            Can the VM request VM death events?
/**
             * Can the VM request VM death events?
             */
            final boolean canRequestVMDeathEvent;

            Can the VM set a default stratum?
/**
             * Can the VM set a default stratum?
             */
            final boolean canSetDefaultStratum;

            Can the VM return instances, counts of instances of classes 
and referring objects?
/**
             * Can the VM return instances, counts of instances of classes 
             * and referring objects?
             */
            final boolean canGetInstanceInfo;

            Can the VM request monitor events?
/**
             * Can the VM request monitor events?
             */
            final boolean canRequestMonitorEvents;

            Can the VM get monitors with frame depth info?
/**
             * Can the VM get monitors with frame depth info?
             */
            final boolean canGetMonitorFrameInfo;

            Can the VM filter class prepare events by source name?
/**
             * Can the VM filter class prepare events by source name?
             */
            final boolean canUseSourceNameFilters;

            Can the VM return the constant pool information?
/**
             * Can the VM return the constant pool information?
             */
            final boolean canGetConstantPool;

            Can the VM force early return from a method?
/**
             * Can the VM force early return from a method?
             */
            final boolean canForceEarlyReturn;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved22;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved23;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved24;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved25;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved26;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved27;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved28;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved29;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved30;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved31;

            Reserved for future capability
/**
             * Reserved for future capability
             */
            final boolean reserved32;

            private CapabilitiesNew(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.CapabilitiesNew"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                canWatchFieldModification = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canWatchFieldModification(boolean): " + canWatchFieldModification);
                }
                canWatchFieldAccess = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canWatchFieldAccess(boolean): " + canWatchFieldAccess);
                }
                canGetBytecodes = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetBytecodes(boolean): " + canGetBytecodes);
                }
                canGetSyntheticAttribute = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetSyntheticAttribute(boolean): " + canGetSyntheticAttribute);
                }
                canGetOwnedMonitorInfo = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetOwnedMonitorInfo(boolean): " + canGetOwnedMonitorInfo);
                }
                canGetCurrentContendedMonitor = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetCurrentContendedMonitor(boolean): " + canGetCurrentContendedMonitor);
                }
                canGetMonitorInfo = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetMonitorInfo(boolean): " + canGetMonitorInfo);
                }
                canRedefineClasses = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canRedefineClasses(boolean): " + canRedefineClasses);
                }
                canAddMethod = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canAddMethod(boolean): " + canAddMethod);
                }
                canUnrestrictedlyRedefineClasses = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canUnrestrictedlyRedefineClasses(boolean): " + canUnrestrictedlyRedefineClasses);
                }
                canPopFrames = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canPopFrames(boolean): " + canPopFrames);
                }
                canUseInstanceFilters = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canUseInstanceFilters(boolean): " + canUseInstanceFilters);
                }
                canGetSourceDebugExtension = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetSourceDebugExtension(boolean): " + canGetSourceDebugExtension);
                }
                canRequestVMDeathEvent = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canRequestVMDeathEvent(boolean): " + canRequestVMDeathEvent);
                }
                canSetDefaultStratum = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canSetDefaultStratum(boolean): " + canSetDefaultStratum);
                }
                canGetInstanceInfo = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetInstanceInfo(boolean): " + canGetInstanceInfo);
                }
                canRequestMonitorEvents = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canRequestMonitorEvents(boolean): " + canRequestMonitorEvents);
                }
                canGetMonitorFrameInfo = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetMonitorFrameInfo(boolean): " + canGetMonitorFrameInfo);
                }
                canUseSourceNameFilters = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canUseSourceNameFilters(boolean): " + canUseSourceNameFilters);
                }
                canGetConstantPool = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canGetConstantPool(boolean): " + canGetConstantPool);
                }
                canForceEarlyReturn = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "canForceEarlyReturn(boolean): " + canForceEarlyReturn);
                }
                reserved22 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved22(boolean): " + reserved22);
                }
                reserved23 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved23(boolean): " + reserved23);
                }
                reserved24 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved24(boolean): " + reserved24);
                }
                reserved25 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved25(boolean): " + reserved25);
                }
                reserved26 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved26(boolean): " + reserved26);
                }
                reserved27 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved27(boolean): " + reserved27);
                }
                reserved28 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved28(boolean): " + reserved28);
                }
                reserved29 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved29(boolean): " + reserved29);
                }
                reserved30 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved30(boolean): " + reserved30);
                }
                reserved31 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved31(boolean): " + reserved31);
                }
                reserved32 = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "reserved32(boolean): " + reserved32);
                }
            }
        }

        Installs new class definitions. 
If there are active stack frames in methods of the redefined classes in the 
target VM then those active frames continue to run the bytecodes of the 
original method. These methods are considered obsolete - see 
IsObsolete. The methods in the 
redefined classes will be used for new invokes in the target VM. 
The original method ID refers to the redefined method. 
All breakpoints in the redefined classes are cleared.
If resetting of stack frames is desired, the 
PopFrames command can be used 
to pop frames with obsolete methods.

Unless the canUnrestrictedlyRedefineClasses capability is present 
the redefinition must follow the restrictions described in 
JVM TI RedefineClasses.

Requires canRedefineClasses capability - see 
CapabilitiesNew. 
@Deprecated(since="15")  
In addition to the canRedefineClasses capability, the target VM must 
have the canAddMethod capability to add methods when redefining classes, 
or the canUnrestrictedlyRedefineClasses capability to redefine classes in ways 
that are normally restricted.
/**
         * Installs new class definitions. 
         * If there are active stack frames in methods of the redefined classes in the 
         * target VM then those active frames continue to run the bytecodes of the 
         * original method. These methods are considered obsolete - see 
         * <a href="#JDWP_Method_IsObsolete">IsObsolete</a>. The methods in the 
         * redefined classes will be used for new invokes in the target VM. 
         * The original method ID refers to the redefined method. 
         * All breakpoints in the redefined classes are cleared.
         * If resetting of stack frames is desired, the 
         * <a href="#JDWP_StackFrame_PopFrames">PopFrames</a> command can be used 
         * to pop frames with obsolete methods.
         * <p>
         * Unless the canUnrestrictedlyRedefineClasses capability is present 
         * the redefinition must follow the restrictions described in 
         * <a href="../jvmti.html#RedefineClasses">JVM TI RedefineClasses</a>.
         * <p>
         * Requires canRedefineClasses capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>. 
         * <p>@Deprecated(since="15")  
         * In addition to the canRedefineClasses capability, the target VM must 
         * have the canAddMethod capability to add methods when redefining classes, 
         * or the canUnrestrictedlyRedefineClasses capability to redefine classes in ways 
         * that are normally restricted.
         */
        static class RedefineClasses {
            static final int COMMAND = 18;

            static class ClassDef {

                The reference type.
/**
                 * The reference type.
                 */
                final ReferenceTypeImpl refType;

                Number of bytes defining class (below)
/**
                 * Number of bytes defining class (below)
                 */
                final byte[] classfile;

                ClassDef(ReferenceTypeImpl refType, byte[] classfile) {
                    this.refType = refType;
                    this.classfile = classfile;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                    }
                    ps.writeClassRef(refType.ref());
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     classfile(byte[]): " + "");
                    }
                    ps.writeInt(classfile.length);
                    for (int i = 0; i < classfile.length; i++) {;
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         classfile[i](byte): " + classfile[i]);
                        }
                        ps.writeByte(classfile[i]);
                    }
                }
            }

            static RedefineClasses process(VirtualMachineImpl vm, 
                                ClassDef[] classes)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, classes);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassDef[] classes) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.RedefineClasses"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 classes(ClassDef[]): " + "");
                }
                ps.writeInt(classes.length);
                for (int i = 0; i < classes.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     classes[i](ClassDef): " + "");
                    }
                    classes[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static RedefineClasses waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new RedefineClasses(vm, ps);
            }


            private RedefineClasses(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.RedefineClasses"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Set the default stratum. Requires canSetDefaultStratum capability - see 
CapabilitiesNew.
/**
         * Set the default stratum. Requires canSetDefaultStratum capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class SetDefaultStratum {
            static final int COMMAND = 19;

            static SetDefaultStratum process(VirtualMachineImpl vm, 
                                String stratumID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, stratumID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                String stratumID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.SetDefaultStratum"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 stratumID(String): " + stratumID);
                }
                ps.writeString(stratumID);
                ps.send();
                return ps;
            }

            static SetDefaultStratum waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SetDefaultStratum(vm, ps);
            }


            private SetDefaultStratum(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.SetDefaultStratum"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Returns reference types for all classes currently loaded by the 
target VM.  
Both the JNI signature and the generic signature are 
returned for each class.  
Generic signatures are described in the signature attribute 
section in 
The Java Virtual Machine Specification. 
Since JDWP version 1.5.
/**
         * Returns reference types for all classes currently loaded by the 
         * target VM.  
         * Both the JNI signature and the generic signature are 
         * returned for each class.  
         * Generic signatures are described in the signature attribute 
         * section in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * Since JDWP version 1.5.
         */
        static class AllClassesWithGeneric {
            static final int COMMAND = 20;

            static AllClassesWithGeneric process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllClassesWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static AllClassesWithGeneric waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new AllClassesWithGeneric(vm, ps);
            }

            static class ClassInfo {

                Kind 
of following reference type. 
/**
                 * <a href="#JDWP_TypeTag">Kind</a> 
                 * of following reference type. 
                 */
                final byte refTypeTag;

                Loaded reference type
/**
                 * Loaded reference type
                 */
                final long typeID;

                The JNI signature of the loaded reference type.
/**
                 * The JNI signature of the loaded reference type.
                 */
                final String signature;

                The generic signature of the loaded reference type 
or an empty string if there is none.
/**
                 * The generic signature of the loaded reference type 
                 * or an empty string if there is none.
                 */
                final String genericSignature;

                The current class 
status. 
/**
                 * The current class 
                 * <a href="#JDWP_ClassStatus">status.</a> 
                 */
                final int status;

                private ClassInfo(VirtualMachineImpl vm, PacketStream ps) {
                    refTypeTag = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "refTypeTag(byte): " + refTypeTag);
                    }
                    typeID = ps.readClassRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "typeID(long): " + "ref="+typeID);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    genericSignature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "genericSignature(String): " + genericSignature);
                    }
                    status = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "status(int): " + status);
                    }
                }
            }


            Number of reference types that follow.
/**
             * Number of reference types that follow.
             */
            final ClassInfo[] classes;

            private AllClassesWithGeneric(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllClassesWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classes(ClassInfo[]): " + "");
                }
                int classesCount = ps.readInt();
                classes = new ClassInfo[classesCount];
                for (int i = 0; i < classesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "classes[i](ClassInfo): " + "");
                    }
                    classes[i] = new ClassInfo(vm, ps);
                }
            }
        }

        Returns the number of instances of each reference type in the input list. 
Only instances that are reachable for the purposes of 
garbage collection are counted.  If a reference type is invalid, 
eg. it has been unloaded, zero is returned for its instance count.
Since JDWP version 1.6. Requires canGetInstanceInfo capability - see 
CapabilitiesNew.
/**
         * Returns the number of instances of each reference type in the input list. 
         * Only instances that are reachable for the purposes of 
         * garbage collection are counted.  If a reference type is invalid, 
         * eg. it has been unloaded, zero is returned for its instance count.
         * <p>Since JDWP version 1.6. Requires canGetInstanceInfo capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class InstanceCounts {
            static final int COMMAND = 21;

            static InstanceCounts process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl[] refTypesCount)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refTypesCount);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl[] refTypesCount) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.InstanceCounts"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refTypesCount(ReferenceTypeImpl[]): " + "");
                }
                ps.writeInt(refTypesCount.length);
                for (int i = 0; i < refTypesCount.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     refTypesCount[i](ReferenceTypeImpl): " + (refTypesCount[i]==null?"NULL":"ref="+refTypesCount[i].ref()));
                    }
                    ps.writeClassRef(refTypesCount[i].ref());
                }
                ps.send();
                return ps;
            }

            static InstanceCounts waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new InstanceCounts(vm, ps);
            }


            The number of counts that follow.
/**
             * The number of counts that follow.
             */
            final long[] counts;

            private InstanceCounts(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.InstanceCounts"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "counts(long[]): " + "");
                }
                int countsCount = ps.readInt();
                counts = new long[countsCount];
                for (int i = 0; i < countsCount; i++) {;
                    counts[i] = ps.readLong();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "counts[i](long): " + counts[i]);
                    }
                }
            }
        }

        Returns all modules in the target VM.
Since JDWP version 9.
/**
         * Returns all modules in the target VM.
         * <p>Since JDWP version 9.
         */
        static class AllModules {
            static final int COMMAND = 22;

            static AllModules process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllModules"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static AllModules waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new AllModules(vm, ps);
            }


            The number of the modules that follow.
/**
             * The number of the modules that follow.
             */
            final ModuleReferenceImpl[] modules;

            private AllModules(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.VirtualMachine.AllModules"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "modules(ModuleReferenceImpl[]): " + "");
                }
                int modulesCount = ps.readInt();
                modules = new ModuleReferenceImpl[modulesCount];
                for (int i = 0; i < modulesCount; i++) {;
                    modules[i] = ps.readModule();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "modules[i](ModuleReferenceImpl): " + (modules[i]==null?"NULL":"ref="+modules[i].ref()));
                    }
                }
            }
        }
    }

    static class ReferenceType {
        static final int COMMAND_SET = 2;
        private ReferenceType() {}  // hide constructor

        Returns the type signature of a reference type. 
Type signature formats are the same as specified in 
JVM TI GetClassSignature.
/**
         * Returns the type signature of a reference type. 
         * Type signature formats are the same as specified in 
         * <a href="../jvmti.html#GetClassSignature">JVM TI GetClassSignature</a>.
         */
        static class Signature {
            static final int COMMAND = 1;

            static Signature process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Signature"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Signature waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Signature(vm, ps);
            }


            The JNI signature for the reference type.
/**
             * The JNI signature for the reference type.
             */
            final String signature;

            private Signature(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Signature"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                signature = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "signature(String): " + signature);
                }
            }
        }

        Returns the instance of java.lang.ClassLoader which loaded 
a given reference type. If the reference type was loaded by the 
system class loader, the returned object ID is null.
/**
         * Returns the instance of java.lang.ClassLoader which loaded 
         * a given reference type. If the reference type was loaded by the 
         * system class loader, the returned object ID is null.
         */
        static class ClassLoader {
            static final int COMMAND = 2;

            static ClassLoader process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ClassLoader"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static ClassLoader waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClassLoader(vm, ps);
            }


            The class loader for the reference type. 
/**
             * The class loader for the reference type. 
             */
            final ClassLoaderReferenceImpl classLoader;

            private ClassLoader(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ClassLoader"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                classLoader = ps.readClassLoaderReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classLoader(ClassLoaderReferenceImpl): " + (classLoader==null?"NULL":"ref="+classLoader.ref()));
                }
            }
        }

        Returns the modifiers (also known as access flags) for a reference type. 
The returned bit mask contains information on the declaration 
of the reference type. If the reference type is an array or 
a primitive class (for example, java.lang.Integer.TYPE), the 
value of the returned bit mask is undefined.
/**
         * Returns the modifiers (also known as access flags) for a reference type. 
         * The returned bit mask contains information on the declaration 
         * of the reference type. If the reference type is an array or 
         * a primitive class (for example, java.lang.Integer.TYPE), the 
         * value of the returned bit mask is undefined.
         */
        static class Modifiers {
            static final int COMMAND = 3;

            static Modifiers process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Modifiers"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Modifiers waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Modifiers(vm, ps);
            }


            Modifier bits as defined in Chapter 4 of 
The Java Virtual Machine Specification
/**
             * Modifier bits as defined in Chapter 4 of 
             * <cite>The Java Virtual Machine Specification</cite>
             */
            final int modBits;

            private Modifiers(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Modifiers"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                modBits = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "modBits(int): " + modBits);
                }
            }
        }

        Returns information for each field in a reference type. 
Inherited fields are not included. 
The field list will include any synthetic fields created 
by the compiler. 
Fields are returned in the order they occur in the class file.
/**
         * Returns information for each field in a reference type. 
         * Inherited fields are not included. 
         * The field list will include any synthetic fields created 
         * by the compiler. 
         * Fields are returned in the order they occur in the class file.
         */
        static class Fields {
            static final int COMMAND = 4;

            static Fields process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Fields"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Fields waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Fields(vm, ps);
            }

            static class FieldInfo {

                Field ID.
/**
                 * Field ID.
                 */
                final long fieldID;

                Name of field.
/**
                 * Name of field.
                 */
                final String name;

                JNI Signature of field.
/**
                 * JNI Signature of field.
                 */
                final String signature;

                The modifier bit flags (also known as access flags) 
which provide additional information on the  
field declaration. Individual flag values are 
defined in Chapter 4 of 
The Java Virtual Machine Specification. 
In addition, The 0xf0000000 bit identifies 
the field as synthetic, if the synthetic attribute 
capability is available.
/**
                 * The modifier bit flags (also known as access flags) 
                 * which provide additional information on the  
                 * field declaration. Individual flag values are 
                 * defined in Chapter 4 of 
                 * <cite>The Java Virtual Machine Specification</cite>. 
                 * In addition, The <code>0xf0000000</code> bit identifies 
                 * the field as synthetic, if the synthetic attribute 
                 * <a href="#JDWP_VirtualMachine_Capabilities">capability</a> is available.
                 */
                final int modBits;

                private FieldInfo(VirtualMachineImpl vm, PacketStream ps) {
                    fieldID = ps.readFieldRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "fieldID(long): " + fieldID);
                    }
                    name = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "name(String): " + name);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    modBits = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "modBits(int): " + modBits);
                    }
                }
            }


            Number of declared fields.
/**
             * Number of declared fields.
             */
            final FieldInfo[] declared;

            private Fields(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Fields"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "declared(FieldInfo[]): " + "");
                }
                int declaredCount = ps.readInt();
                declared = new FieldInfo[declaredCount];
                for (int i = 0; i < declaredCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "declared[i](FieldInfo): " + "");
                    }
                    declared[i] = new FieldInfo(vm, ps);
                }
            }
        }

        Returns information for each method in a reference type. 
Inherited methods are not included. The list of methods will 
include constructors (identified with the name "<init>"), 
the initialization method (identified with the name "<clinit>") 
if present, and any synthetic methods created by the compiler. 
Methods are returned in the order they occur in the class file.
/**
         * Returns information for each method in a reference type. 
         * Inherited methods are not included. The list of methods will 
         * include constructors (identified with the name "&lt;init&gt;"), 
         * the initialization method (identified with the name "&lt;clinit&gt;") 
         * if present, and any synthetic methods created by the compiler. 
         * Methods are returned in the order they occur in the class file.
         */
        static class Methods {
            static final int COMMAND = 5;

            static Methods process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Methods"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Methods waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Methods(vm, ps);
            }

            static class MethodInfo {

                Method ID.
/**
                 * Method ID.
                 */
                final long methodID;

                Name of method.
/**
                 * Name of method.
                 */
                final String name;

                JNI signature of method.
/**
                 * JNI signature of method.
                 */
                final String signature;

                The modifier bit flags (also known as access flags) 
which provide additional information on the  
method declaration. Individual flag values are 
defined in Chapter 4 of 
The Java Virtual Machine Specification. 
In addition, The 0xf0000000 bit identifies 
the method as synthetic, if the synthetic attribute 
capability is available.
/**
                 * The modifier bit flags (also known as access flags) 
                 * which provide additional information on the  
                 * method declaration. Individual flag values are 
                 * defined in Chapter 4 of 
                 * <cite>The Java Virtual Machine Specification</cite>. 
                 * In addition, The <code>0xf0000000</code> bit identifies 
                 * the method as synthetic, if the synthetic attribute 
                 * <a href="#JDWP_VirtualMachine_Capabilities">capability</a> is available.
                 */
                final int modBits;

                private MethodInfo(VirtualMachineImpl vm, PacketStream ps) {
                    methodID = ps.readMethodRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "methodID(long): " + methodID);
                    }
                    name = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "name(String): " + name);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    modBits = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "modBits(int): " + modBits);
                    }
                }
            }


            Number of declared methods.
/**
             * Number of declared methods.
             */
            final MethodInfo[] declared;

            private Methods(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Methods"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "declared(MethodInfo[]): " + "");
                }
                int declaredCount = ps.readInt();
                declared = new MethodInfo[declaredCount];
                for (int i = 0; i < declaredCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "declared[i](MethodInfo): " + "");
                    }
                    declared[i] = new MethodInfo(vm, ps);
                }
            }
        }

        Returns the value of one or more static fields of the 
reference type. Each field must be member of the reference type 
or one of its superclasses, superinterfaces, or implemented interfaces. 
Access control is not enforced; for example, the values of private 
fields can be obtained.
/**
         * Returns the value of one or more static fields of the 
         * reference type. Each field must be member of the reference type 
         * or one of its superclasses, superinterfaces, or implemented interfaces. 
         * Access control is not enforced; for example, the values of private 
         * fields can be obtained.
         */
        static class GetValues {
            static final int COMMAND = 6;

            static class Field {

                A field to get
/**
                 * A field to get
                 */
                final long fieldID;

                Field(long fieldID) {
                    this.fieldID = fieldID;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     fieldID(long): " + fieldID);
                    }
                    ps.writeFieldRef(fieldID);
                }
            }

            static GetValues process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                Field[] fields)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, fields);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                Field[] fields) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 fields(Field[]): " + "");
                }
                ps.writeInt(fields.length);
                for (int i = 0; i < fields.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     fields[i](Field): " + "");
                    }
                    fields[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static GetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new GetValues(vm, ps);
            }


            The number of values returned, always equal to fields, 
the number of values to get.
/**
             * The number of values returned, always equal to fields, 
             * the number of values to get.
             */
            final ValueImpl[] values;

            private GetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "values(ValueImpl[]): " + "");
                }
                int valuesCount = ps.readInt();
                values = new ValueImpl[valuesCount];
                for (int i = 0; i < valuesCount; i++) {;
                    values[i] = ps.readValue();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "values[i](ValueImpl): " + values[i]);
                    }
                }
            }
        }

        Returns the name of source file in which a reference type was 
declared. 
/**
         * Returns the name of source file in which a reference type was 
         * declared. 
         */
        static class SourceFile {
            static final int COMMAND = 7;

            static SourceFile process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.SourceFile"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static SourceFile waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SourceFile(vm, ps);
            }


            The source file name. No path information 
for the file is included
/**
             * The source file name. No path information 
             * for the file is included
             */
            final String sourceFile;

            private SourceFile(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.SourceFile"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                sourceFile = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "sourceFile(String): " + sourceFile);
                }
            }
        }

        Returns the classes and interfaces directly nested within this type.
Types further nested within those types are not included. 
/**
         * Returns the classes and interfaces directly nested within this type.
         * Types further nested within those types are not included. 
         */
        static class NestedTypes {
            static final int COMMAND = 8;

            static NestedTypes process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.NestedTypes"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static NestedTypes waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new NestedTypes(vm, ps);
            }

            static class TypeInfo {

                Kind 
of following reference type. 
/**
                 * <a href="#JDWP_TypeTag">Kind</a> 
                 * of following reference type. 
                 */
                final byte refTypeTag;

                The nested class or interface ID.
/**
                 * The nested class or interface ID.
                 */
                final long typeID;

                private TypeInfo(VirtualMachineImpl vm, PacketStream ps) {
                    refTypeTag = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "refTypeTag(byte): " + refTypeTag);
                    }
                    typeID = ps.readClassRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "typeID(long): " + "ref="+typeID);
                    }
                }
            }


            The number of nested classes and interfaces
/**
             * The number of nested classes and interfaces
             */
            final TypeInfo[] classes;

            private NestedTypes(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.NestedTypes"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classes(TypeInfo[]): " + "");
                }
                int classesCount = ps.readInt();
                classes = new TypeInfo[classesCount];
                for (int i = 0; i < classesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "classes[i](TypeInfo): " + "");
                    }
                    classes[i] = new TypeInfo(vm, ps);
                }
            }
        }

        Returns the current status of the reference type. The status 
indicates the extent to which the reference type has been 
initialized, as described in section 2.1.6 of 
The Java Virtual Machine Specification. 
If the class is linked the PREPARED and VERIFIED bits in the returned status bits 
will be set. If the class is initialized the INITIALIZED bit in the returned 
status bits will be set. If an error occured during initialization then the 
ERROR bit in the returned status bits will be set. 
The returned status bits are undefined for array types and for 
primitive classes (such as java.lang.Integer.TYPE). 
/**
         * Returns the current status of the reference type. The status 
         * indicates the extent to which the reference type has been 
         * initialized, as described in section 2.1.6 of 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * If the class is linked the PREPARED and VERIFIED bits in the returned status bits 
         * will be set. If the class is initialized the INITIALIZED bit in the returned 
         * status bits will be set. If an error occured during initialization then the 
         * ERROR bit in the returned status bits will be set. 
         * The returned status bits are undefined for array types and for 
         * primitive classes (such as java.lang.Integer.TYPE). 
         */
        static class Status {
            static final int COMMAND = 9;

            static Status process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Status"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Status waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Status(vm, ps);
            }


            Status bits:
See JDWP.ClassStatus
/**
             * <a href="#JDWP_ClassStatus">Status</a> bits:
             * See <a href="#JDWP_ClassStatus">JDWP.ClassStatus</a>
             */
            final int status;

            private Status(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Status"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                status = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "status(int): " + status);
                }
            }
        }

        Returns the interfaces declared as implemented by this class. 
Interfaces indirectly implemented (extended by the implemented 
interface or implemented by a superclass) are not included.
/**
         * Returns the interfaces declared as implemented by this class. 
         * Interfaces indirectly implemented (extended by the implemented 
         * interface or implemented by a superclass) are not included.
         */
        static class Interfaces {
            static final int COMMAND = 10;

            static Interfaces process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Interfaces"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Interfaces waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Interfaces(vm, ps);
            }


            The number of implemented interfaces
/**
             * The number of implemented interfaces
             */
            final InterfaceTypeImpl[] interfaces;

            private Interfaces(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Interfaces"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "interfaces(InterfaceTypeImpl[]): " + "");
                }
                int interfacesCount = ps.readInt();
                interfaces = new InterfaceTypeImpl[interfacesCount];
                for (int i = 0; i < interfacesCount; i++) {;
                    interfaces[i] = vm.interfaceType(ps.readClassRef());
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "interfaces[i](InterfaceTypeImpl): " + (interfaces[i]==null?"NULL":"ref="+interfaces[i].ref()));
                    }
                }
            }
        }

        Returns the class object corresponding to this type. 
/**
         * Returns the class object corresponding to this type. 
         */
        static class ClassObject {
            static final int COMMAND = 11;

            static ClassObject process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ClassObject"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static ClassObject waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClassObject(vm, ps);
            }


            class object.
/**
             * class object.
             */
            final ClassObjectReferenceImpl classObject;

            private ClassObject(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ClassObject"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                classObject = ps.readClassObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classObject(ClassObjectReferenceImpl): " + (classObject==null?"NULL":"ref="+classObject.ref()));
                }
            }
        }

        Returns the value of the SourceDebugExtension attribute. 
Since JDWP version 1.4. Requires canGetSourceDebugExtension capability - see 
CapabilitiesNew.
/**
         * Returns the value of the SourceDebugExtension attribute. 
         * Since JDWP version 1.4. Requires canGetSourceDebugExtension capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class SourceDebugExtension {
            static final int COMMAND = 12;

            static SourceDebugExtension process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.SourceDebugExtension"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static SourceDebugExtension waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SourceDebugExtension(vm, ps);
            }


            extension attribute
/**
             * extension attribute
             */
            final String extension;

            private SourceDebugExtension(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.SourceDebugExtension"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                extension = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "extension(String): " + extension);
                }
            }
        }

        Returns the JNI signature of a reference type along with the 
generic signature if there is one.  
Generic signatures are described in the signature attribute 
section in 
The Java Virtual Machine Specification. 
Since JDWP version 1.5.
/**
         * Returns the JNI signature of a reference type along with the 
         * generic signature if there is one.  
         * Generic signatures are described in the signature attribute 
         * section in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * Since JDWP version 1.5.
         */
        static class SignatureWithGeneric {
            static final int COMMAND = 13;

            static SignatureWithGeneric process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.SignatureWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static SignatureWithGeneric waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SignatureWithGeneric(vm, ps);
            }


            The JNI signature for the reference type.
/**
             * The JNI signature for the reference type.
             */
            final String signature;

            The generic signature for the reference type or an empty 
string if there is none.
/**
             * The generic signature for the reference type or an empty 
             * string if there is none.
             */
            final String genericSignature;

            private SignatureWithGeneric(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.SignatureWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                signature = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "signature(String): " + signature);
                }
                genericSignature = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "genericSignature(String): " + genericSignature);
                }
            }
        }

        Returns information, including the generic signature if any, 
for each field in a reference type. 
Inherited fields are not included. 
The field list will include any synthetic fields created 
by the compiler. 
Fields are returned in the order they occur in the class file.  
Generic signatures are described in the signature attribute 
section in 
The Java Virtual Machine Specification. 
Since JDWP version 1.5.
/**
         * Returns information, including the generic signature if any, 
         * for each field in a reference type. 
         * Inherited fields are not included. 
         * The field list will include any synthetic fields created 
         * by the compiler. 
         * Fields are returned in the order they occur in the class file.  
         * Generic signatures are described in the signature attribute 
         * section in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * Since JDWP version 1.5.
         */
        static class FieldsWithGeneric {
            static final int COMMAND = 14;

            static FieldsWithGeneric process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.FieldsWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static FieldsWithGeneric waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new FieldsWithGeneric(vm, ps);
            }

            static class FieldInfo {

                Field ID.
/**
                 * Field ID.
                 */
                final long fieldID;

                The name of the field.
/**
                 * The name of the field.
                 */
                final String name;

                The JNI signature of the field.
/**
                 * The JNI signature of the field.
                 */
                final String signature;

                The generic signature of the 
field, or an empty string if there is none.
/**
                 * The generic signature of the 
                 * field, or an empty string if there is none.
                 */
                final String genericSignature;

                The modifier bit flags (also known as access flags) 
which provide additional information on the  
field declaration. Individual flag values are 
defined in Chapter 4 of 
The Java Virtual Machine Specification. 
In addition, The 0xf0000000 bit identifies 
the field as synthetic, if the synthetic attribute 
capability is available.
/**
                 * The modifier bit flags (also known as access flags) 
                 * which provide additional information on the  
                 * field declaration. Individual flag values are 
                 * defined in Chapter 4 of 
                 * <cite>The Java Virtual Machine Specification</cite>. 
                 * In addition, The <code>0xf0000000</code> bit identifies 
                 * the field as synthetic, if the synthetic attribute 
                 * <a href="#JDWP_VirtualMachine_Capabilities">capability</a> is available.
                 */
                final int modBits;

                private FieldInfo(VirtualMachineImpl vm, PacketStream ps) {
                    fieldID = ps.readFieldRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "fieldID(long): " + fieldID);
                    }
                    name = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "name(String): " + name);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    genericSignature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "genericSignature(String): " + genericSignature);
                    }
                    modBits = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "modBits(int): " + modBits);
                    }
                }
            }


            Number of declared fields.
/**
             * Number of declared fields.
             */
            final FieldInfo[] declared;

            private FieldsWithGeneric(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.FieldsWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "declared(FieldInfo[]): " + "");
                }
                int declaredCount = ps.readInt();
                declared = new FieldInfo[declaredCount];
                for (int i = 0; i < declaredCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "declared[i](FieldInfo): " + "");
                    }
                    declared[i] = new FieldInfo(vm, ps);
                }
            }
        }

        Returns information, including the generic signature if any, 
for each method in a reference type. 
Inherited methodss are not included. The list of methods will 
include constructors (identified with the name "<init>"), 
the initialization method (identified with the name "<clinit>") 
if present, and any synthetic methods created by the compiler. 
Methods are returned in the order they occur in the class file.  
Generic signatures are described in the signature attribute 
section in 
The Java Virtual Machine Specification. 
Since JDWP version 1.5.
/**
         * Returns information, including the generic signature if any, 
         * for each method in a reference type. 
         * Inherited methodss are not included. The list of methods will 
         * include constructors (identified with the name "&lt;init&gt;"), 
         * the initialization method (identified with the name "&lt;clinit&gt;") 
         * if present, and any synthetic methods created by the compiler. 
         * Methods are returned in the order they occur in the class file.  
         * Generic signatures are described in the signature attribute 
         * section in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * Since JDWP version 1.5.
         */
        static class MethodsWithGeneric {
            static final int COMMAND = 15;

            static MethodsWithGeneric process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.MethodsWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static MethodsWithGeneric waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new MethodsWithGeneric(vm, ps);
            }

            static class MethodInfo {

                Method ID.
/**
                 * Method ID.
                 */
                final long methodID;

                The name of the method.
/**
                 * The name of the method.
                 */
                final String name;

                The JNI signature of the method.
/**
                 * The JNI signature of the method.
                 */
                final String signature;

                The generic signature of the method, or 
an empty string if there is none.
/**
                 * The generic signature of the method, or 
                 * an empty string if there is none.
                 */
                final String genericSignature;

                The modifier bit flags (also known as access flags) 
which provide additional information on the  
method declaration. Individual flag values are 
defined in Chapter 4 of 
The Java Virtual Machine Specification. 
In addition, The 0xf0000000 bit identifies 
the method as synthetic, if the synthetic attribute 
capability is available.
/**
                 * The modifier bit flags (also known as access flags) 
                 * which provide additional information on the  
                 * method declaration. Individual flag values are 
                 * defined in Chapter 4 of 
                 * <cite>The Java Virtual Machine Specification</cite>. 
                 * In addition, The <code>0xf0000000</code> bit identifies 
                 * the method as synthetic, if the synthetic attribute 
                 * <a href="#JDWP_VirtualMachine_Capabilities">capability</a> is available.
                 */
                final int modBits;

                private MethodInfo(VirtualMachineImpl vm, PacketStream ps) {
                    methodID = ps.readMethodRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "methodID(long): " + methodID);
                    }
                    name = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "name(String): " + name);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    genericSignature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "genericSignature(String): " + genericSignature);
                    }
                    modBits = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "modBits(int): " + modBits);
                    }
                }
            }


            Number of declared methods.
/**
             * Number of declared methods.
             */
            final MethodInfo[] declared;

            private MethodsWithGeneric(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.MethodsWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "declared(MethodInfo[]): " + "");
                }
                int declaredCount = ps.readInt();
                declared = new MethodInfo[declaredCount];
                for (int i = 0; i < declaredCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "declared[i](MethodInfo): " + "");
                    }
                    declared[i] = new MethodInfo(vm, ps);
                }
            }
        }

        Returns instances of this reference type. 
Only instances that are reachable for the purposes of 
garbage collection are returned. 
Since JDWP version 1.6. Requires canGetInstanceInfo capability - see 
CapabilitiesNew.
/**
         * Returns instances of this reference type. 
         * Only instances that are reachable for the purposes of 
         * garbage collection are returned. 
         * <p>Since JDWP version 1.6. Requires canGetInstanceInfo capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class Instances {
            static final int COMMAND = 16;

            static Instances process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                int maxInstances)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, maxInstances);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                int maxInstances) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Instances"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 maxInstances(int): " + maxInstances);
                }
                ps.writeInt(maxInstances);
                ps.send();
                return ps;
            }

            static Instances waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Instances(vm, ps);
            }


            The number of instances that follow.
/**
             * The number of instances that follow.
             */
            final ObjectReferenceImpl[] instances;

            private Instances(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Instances"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "instances(ObjectReferenceImpl[]): " + "");
                }
                int instancesCount = ps.readInt();
                instances = new ObjectReferenceImpl[instancesCount];
                for (int i = 0; i < instancesCount; i++) {;
                    instances[i] = ps.readTaggedObjectReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "instances[i](ObjectReferenceImpl): " + (instances[i]==null?"NULL":"ref="+instances[i].ref()));
                    }
                }
            }
        }

        Returns the class file major and minor version numbers, as defined in the class 
file format of the Java Virtual Machine specification. 
Since JDWP version 1.6. 
/**
         * Returns the class file major and minor version numbers, as defined in the class 
         * file format of the Java Virtual Machine specification. 
         * <p>Since JDWP version 1.6. 
         */
        static class ClassFileVersion {
            static final int COMMAND = 17;

            static ClassFileVersion process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ClassFileVersion"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static ClassFileVersion waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClassFileVersion(vm, ps);
            }


            Major version number
/**
             * Major version number
             */
            final int majorVersion;

            Minor version number
/**
             * Minor version number
             */
            final int minorVersion;

            private ClassFileVersion(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ClassFileVersion"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                majorVersion = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "majorVersion(int): " + majorVersion);
                }
                minorVersion = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "minorVersion(int): " + minorVersion);
                }
            }
        }

        Return the raw bytes of the constant pool in the format of the 
constant_pool item of the Class File Format in 
The Java Virtual Machine Specification. 
Since JDWP version 1.6. Requires canGetConstantPool capability - see 
CapabilitiesNew.
/**
         * Return the raw bytes of the constant pool in the format of the 
         * constant_pool item of the Class File Format in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * <p>Since JDWP version 1.6. Requires canGetConstantPool capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         * 
         */
        static class ConstantPool {
            static final int COMMAND = 18;

            static ConstantPool process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ConstantPool"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static ConstantPool waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ConstantPool(vm, ps);
            }


            Total number of constant pool entries plus one. This 
corresponds to the constant_pool_count item of the 
Class File Format in 
The Java Virtual Machine Specification. 
/**
             * Total number of constant pool entries plus one. This 
             * corresponds to the constant_pool_count item of the 
             * Class File Format in 
             * <cite>The Java Virtual Machine Specification</cite>. 
             */
            final int count;

            final byte[] bytes;

            private ConstantPool(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.ConstantPool"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                count = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "count(int): " + count);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "bytes(byte[]): " + "");
                }
                int bytesCount = ps.readInt();
                bytes = new byte[bytesCount];
                for (int i = 0; i < bytesCount; i++) {;
                    bytes[i] = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "bytes[i](byte): " + bytes[i]);
                    }
                }
            }
        }

        Returns the module that this reference type belongs to.
Since JDWP version 9.
/**
         * Returns the module that this reference type belongs to.
         * <p>Since JDWP version 9.
         */
        static class Module {
            static final int COMMAND = 19;

            static Module process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Module"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                ps.send();
                return ps;
            }

            static Module waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Module(vm, ps);
            }


            The module this reference type belongs to.
/**
             * The module this reference type belongs to.
             */
            final ModuleReferenceImpl module;

            private Module(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ReferenceType.Module"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                module = ps.readModule();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "module(ModuleReferenceImpl): " + (module==null?"NULL":"ref="+module.ref()));
                }
            }
        }
    }

    static class ClassType {
        static final int COMMAND_SET = 3;
        private ClassType() {}  // hide constructor

        Returns the immediate superclass of a class.
/**
         * Returns the immediate superclass of a class.
         */
        static class Superclass {
            static final int COMMAND = 1;

            static Superclass process(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, clazz);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ClassType.Superclass"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 clazz(ClassTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                }
                ps.writeClassRef(clazz.ref());
                ps.send();
                return ps;
            }

            static Superclass waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Superclass(vm, ps);
            }


            The superclass (null if the class ID for java.lang.Object is specified).
/**
             * The superclass (null if the class ID for java.lang.Object is specified).
             */
            final ClassTypeImpl superclass;

            private Superclass(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ClassType.Superclass"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                superclass = vm.classType(ps.readClassRef());
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "superclass(ClassTypeImpl): " + (superclass==null?"NULL":"ref="+superclass.ref()));
                }
            }
        }

        Sets the value of one or more static fields. 
Each field must be member of the class type 
or one of its superclasses, superinterfaces, or implemented interfaces. 
Access control is not enforced; for example, the values of private 
fields can be set. Final fields cannot be set.
For primitive values, the value's type must match the 
field's type exactly. For object values, there must exist a 
widening reference conversion from the value's type to the
field's type and the field's type must be loaded. 
/**
         * Sets the value of one or more static fields. 
         * Each field must be member of the class type 
         * or one of its superclasses, superinterfaces, or implemented interfaces. 
         * Access control is not enforced; for example, the values of private 
         * fields can be set. Final fields cannot be set.
         * For primitive values, the value's type must match the 
         * field's type exactly. For object values, there must exist a 
         * widening reference conversion from the value's type to the
         * field's type and the field's type must be loaded. 
         */
        static class SetValues {
            static final int COMMAND = 2;

            A Field/Value pair.
/**
             * A Field/Value pair.
             */
            static class FieldValue {

                Field to set.
/**
                 * Field to set.
                 */
                final long fieldID;

                Value to put in the field.
/**
                 * Value to put in the field.
                 */
                final ValueImpl value;

                FieldValue(long fieldID, ValueImpl value) {
                    this.fieldID = fieldID;
                    this.value = value;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     fieldID(long): " + fieldID);
                    }
                    ps.writeFieldRef(fieldID);
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     value(ValueImpl): " + value);
                    }
                    ps.writeUntaggedValue(value);
                }
            }

            static SetValues process(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz, 
                                FieldValue[] values)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, clazz, values);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz, 
                                FieldValue[] values) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ClassType.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 clazz(ClassTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                }
                ps.writeClassRef(clazz.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 values(FieldValue[]): " + "");
                }
                ps.writeInt(values.length);
                for (int i = 0; i < values.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     values[i](FieldValue): " + "");
                    }
                    values[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static SetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SetValues(vm, ps);
            }


            private SetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ClassType.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Invokes a static method. 
The method must be member of the class type 
or one of its superclasses. 
Access control is not enforced; for example, private 
methods can be invoked.

The method invocation will occur in the specified thread. 
Method invocation can occur only if the specified thread 
has been suspended by an event. 
Method invocation is not supported 
when the target VM has been suspended by the front-end. 

The specified method is invoked with the arguments in the specified 
argument list. 
The method invocation is synchronous; the reply packet is not 
sent until the invoked method returns in the target VM. 
The return value (possibly the void value) is 
included in the reply packet. 
If the invoked method throws an exception, the 
exception object ID is set in the reply packet; otherwise, the 
exception object ID is null. 

For primitive arguments, the argument value's type must match the 
argument's type exactly. For object arguments, there must exist a 
widening reference conversion from the argument value's type to the 
argument's type and the argument's type must be loaded. 

By default, all threads in the target VM are resumed while 
the method is being invoked if they were previously 
suspended by an event or by command. 
This is done to prevent the deadlocks 
that will occur if any of the threads own monitors 
that will be needed by the invoked method. It is possible that 
breakpoints or other events might occur during the invocation. 
Note, however, that this implicit resume acts exactly like 
the ThreadReference resume command, so if the thread's suspend 
count is greater than 1, it will remain in a suspended state 
during the invocation. By default, when the invocation completes, 
all threads in the target VM are suspended, regardless their state 
before the invocation. 

The resumption of other threads during the invoke can be prevented 
by specifying the INVOKE_SINGLE_THREADED 
bit flag in the options field; however, 
there is no protection against or recovery from the deadlocks 
described above, so this option should be used with great caution. 
Only the specified thread will be resumed (as described for all 
threads above). Upon completion of a single threaded invoke, the invoking thread 
will be suspended once again. Note that any threads started during 
the single threaded invocation will not be suspended when the 
invocation completes. 

If the target VM is disconnected during the invoke (for example, through 
the VirtualMachine dispose command) the method invocation continues. 
/**
         * Invokes a static method. 
         * The method must be member of the class type 
         * or one of its superclasses. 
         * Access control is not enforced; for example, private 
         * methods can be invoked.
         * <p>
         * The method invocation will occur in the specified thread. 
         * Method invocation can occur only if the specified thread 
         * has been suspended by an event. 
         * Method invocation is not supported 
         * when the target VM has been suspended by the front-end. 
         * <p>
         * The specified method is invoked with the arguments in the specified 
         * argument list. 
         * The method invocation is synchronous; the reply packet is not 
         * sent until the invoked method returns in the target VM. 
         * The return value (possibly the void value) is 
         * included in the reply packet. 
         * If the invoked method throws an exception, the 
         * exception object ID is set in the reply packet; otherwise, the 
         * exception object ID is null. 
         * <p>
         * For primitive arguments, the argument value's type must match the 
         * argument's type exactly. For object arguments, there must exist a 
         * widening reference conversion from the argument value's type to the 
         * argument's type and the argument's type must be loaded. 
         * <p>
         * By default, all threads in the target VM are resumed while 
         * the method is being invoked if they were previously 
         * suspended by an event or by command. 
         * This is done to prevent the deadlocks 
         * that will occur if any of the threads own monitors 
         * that will be needed by the invoked method. It is possible that 
         * breakpoints or other events might occur during the invocation. 
         * Note, however, that this implicit resume acts exactly like 
         * the ThreadReference resume command, so if the thread's suspend 
         * count is greater than 1, it will remain in a suspended state 
         * during the invocation. By default, when the invocation completes, 
         * all threads in the target VM are suspended, regardless their state 
         * before the invocation. 
         * <p>
         * The resumption of other threads during the invoke can be prevented 
         * by specifying the INVOKE_SINGLE_THREADED 
         * bit flag in the <code>options</code> field; however, 
         * there is no protection against or recovery from the deadlocks 
         * described above, so this option should be used with great caution. 
         * Only the specified thread will be resumed (as described for all 
         * threads above). Upon completion of a single threaded invoke, the invoking thread 
         * will be suspended once again. Note that any threads started during 
         * the single threaded invocation will not be suspended when the 
         * invocation completes. 
         * <p>
         * If the target VM is disconnected during the invoke (for example, through 
         * the VirtualMachine dispose command) the method invocation continues. 
         */
        static class InvokeMethod {
            static final int COMMAND = 3;

            static InvokeMethod process(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz, 
                                ThreadReferenceImpl thread, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, clazz, thread, methodID, arguments, options);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz, 
                                ThreadReferenceImpl thread, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ClassType.InvokeMethod"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 clazz(ClassTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                }
                ps.writeClassRef(clazz.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arguments(ValueImpl[]): " + "");
                }
                ps.writeInt(arguments.length);
                for (int i = 0; i < arguments.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     arguments[i](ValueImpl): " + arguments[i]);
                    }
                    ps.writeValue(arguments[i]);
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 options(int): " + options);
                }
                ps.writeInt(options);
                ps.send();
                return ps;
            }

            static InvokeMethod waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new InvokeMethod(vm, ps);
            }


            The returned value.
/**
             * The returned value.
             */
            final ValueImpl returnValue;

            The thrown exception.
/**
             * The thrown exception.
             */
            final ObjectReferenceImpl exception;

            private InvokeMethod(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ClassType.InvokeMethod"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                returnValue = ps.readValue();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "returnValue(ValueImpl): " + returnValue);
                }
                exception = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "exception(ObjectReferenceImpl): " + (exception==null?"NULL":"ref="+exception.ref()));
                }
            }
        }

        Creates a new object of this type, invoking the specified 
constructor. The constructor method ID must be a member of 
the class type.

Instance creation will occur in the specified thread. 
Instance creation can occur only if the specified thread 
has been suspended by an event. 
Method invocation is not supported 
when the target VM has been suspended by the front-end. 

The specified constructor is invoked with the arguments in the specified 
argument list. 
The constructor invocation is synchronous; the reply packet is not 
sent until the invoked method returns in the target VM. 
The return value (possibly the void value) is 
included in the reply packet. 
If the constructor throws an exception, the 
exception object ID is set in the reply packet; otherwise, the 
exception object ID is null. 

For primitive arguments, the argument value's type must match the 
argument's type exactly. For object arguments, there must exist a 
widening reference conversion from the argument value's type to the 
argument's type and the argument's type must be loaded. 

By default, all threads in the target VM are resumed while 
the method is being invoked if they were previously 
suspended by an event or by command. 
This is done to prevent the deadlocks 
that will occur if any of the threads own monitors 
that will be needed by the invoked method. It is possible that 
breakpoints or other events might occur during the invocation. 
Note, however, that this implicit resume acts exactly like 
the ThreadReference resume command, so if the thread's suspend 
count is greater than 1, it will remain in a suspended state 
during the invocation. By default, when the invocation completes, 
all threads in the target VM are suspended, regardless their state 
before the invocation. 

The resumption of other threads during the invoke can be prevented 
by specifying the INVOKE_SINGLE_THREADED 
bit flag in the options field; however, 
there is no protection against or recovery from the deadlocks 
described above, so this option should be used with great caution. 
Only the specified thread will be resumed (as described for all 
threads above). Upon completion of a single threaded invoke, the invoking thread 
will be suspended once again. Note that any threads started during 
the single threaded invocation will not be suspended when the 
invocation completes. 

If the target VM is disconnected during the invoke (for example, through 
the VirtualMachine dispose command) the method invocation continues. 
/**
         * Creates a new object of this type, invoking the specified 
         * constructor. The constructor method ID must be a member of 
         * the class type.
         * <p>
         * Instance creation will occur in the specified thread. 
         * Instance creation can occur only if the specified thread 
         * has been suspended by an event. 
         * Method invocation is not supported 
         * when the target VM has been suspended by the front-end. 
         * <p>
         * The specified constructor is invoked with the arguments in the specified 
         * argument list. 
         * The constructor invocation is synchronous; the reply packet is not 
         * sent until the invoked method returns in the target VM. 
         * The return value (possibly the void value) is 
         * included in the reply packet. 
         * If the constructor throws an exception, the 
         * exception object ID is set in the reply packet; otherwise, the 
         * exception object ID is null. 
         * <p>
         * For primitive arguments, the argument value's type must match the 
         * argument's type exactly. For object arguments, there must exist a 
         * widening reference conversion from the argument value's type to the 
         * argument's type and the argument's type must be loaded. 
         * <p>
         * By default, all threads in the target VM are resumed while 
         * the method is being invoked if they were previously 
         * suspended by an event or by command. 
         * This is done to prevent the deadlocks 
         * that will occur if any of the threads own monitors 
         * that will be needed by the invoked method. It is possible that 
         * breakpoints or other events might occur during the invocation. 
         * Note, however, that this implicit resume acts exactly like 
         * the ThreadReference resume command, so if the thread's suspend 
         * count is greater than 1, it will remain in a suspended state 
         * during the invocation. By default, when the invocation completes, 
         * all threads in the target VM are suspended, regardless their state 
         * before the invocation. 
         * <p>
         * The resumption of other threads during the invoke can be prevented 
         * by specifying the INVOKE_SINGLE_THREADED 
         * bit flag in the <code>options</code> field; however, 
         * there is no protection against or recovery from the deadlocks 
         * described above, so this option should be used with great caution. 
         * Only the specified thread will be resumed (as described for all 
         * threads above). Upon completion of a single threaded invoke, the invoking thread 
         * will be suspended once again. Note that any threads started during 
         * the single threaded invocation will not be suspended when the 
         * invocation completes. 
         * <p>
         * If the target VM is disconnected during the invoke (for example, through 
         * the VirtualMachine dispose command) the method invocation continues. 
         */
        static class NewInstance {
            static final int COMMAND = 4;

            static NewInstance process(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz, 
                                ThreadReferenceImpl thread, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, clazz, thread, methodID, arguments, options);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassTypeImpl clazz, 
                                ThreadReferenceImpl thread, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ClassType.NewInstance"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 clazz(ClassTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                }
                ps.writeClassRef(clazz.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arguments(ValueImpl[]): " + "");
                }
                ps.writeInt(arguments.length);
                for (int i = 0; i < arguments.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     arguments[i](ValueImpl): " + arguments[i]);
                    }
                    ps.writeValue(arguments[i]);
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 options(int): " + options);
                }
                ps.writeInt(options);
                ps.send();
                return ps;
            }

            static NewInstance waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new NewInstance(vm, ps);
            }


            The newly created object, or null 
if the constructor threw an exception.
/**
             * The newly created object, or null 
             * if the constructor threw an exception.
             */
            final ObjectReferenceImpl newObject;

            The thrown exception, if any; otherwise, null.
/**
             * The thrown exception, if any; otherwise, null.
             */
            final ObjectReferenceImpl exception;

            private NewInstance(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ClassType.NewInstance"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                newObject = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "newObject(ObjectReferenceImpl): " + (newObject==null?"NULL":"ref="+newObject.ref()));
                }
                exception = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "exception(ObjectReferenceImpl): " + (exception==null?"NULL":"ref="+exception.ref()));
                }
            }
        }
    }

    static class ArrayType {
        static final int COMMAND_SET = 4;
        private ArrayType() {}  // hide constructor

        Creates a new array object of this type with a given length.
/**
         * Creates a new array object of this type with a given length.
         */
        static class NewInstance {
            static final int COMMAND = 1;

            static NewInstance process(VirtualMachineImpl vm, 
                                ArrayTypeImpl arrType, 
                                int length)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, arrType, length);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ArrayTypeImpl arrType, 
                                int length) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ArrayType.NewInstance"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arrType(ArrayTypeImpl): " + (arrType==null?"NULL":"ref="+arrType.ref()));
                }
                ps.writeClassRef(arrType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 length(int): " + length);
                }
                ps.writeInt(length);
                ps.send();
                return ps;
            }

            static NewInstance waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new NewInstance(vm, ps);
            }


            The newly created array object. 
/**
             * The newly created array object. 
             */
            final ObjectReferenceImpl newArray;

            private NewInstance(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ArrayType.NewInstance"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                newArray = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "newArray(ObjectReferenceImpl): " + (newArray==null?"NULL":"ref="+newArray.ref()));
                }
            }
        }
    }

    static class InterfaceType {
        static final int COMMAND_SET = 5;
        private InterfaceType() {}  // hide constructor

        Invokes a static method. 
The method must not be a static initializer. 
The method must be a member of the interface type. 
Since JDWP version 1.8 

The method invocation will occur in the specified thread. 
Method invocation can occur only if the specified thread 
has been suspended by an event. 
Method invocation is not supported 
when the target VM has been suspended by the front-end. 

The specified method is invoked with the arguments in the specified 
argument list. 
The method invocation is synchronous; the reply packet is not 
sent until the invoked method returns in the target VM. 
The return value (possibly the void value) is 
included in the reply packet. 
If the invoked method throws an exception, the 
exception object ID is set in the reply packet; otherwise, the 
exception object ID is null. 

For primitive arguments, the argument value's type must match the 
argument's type exactly. For object arguments, there must exist a 
widening reference conversion from the argument value's type to the 
argument's type and the argument's type must be loaded. 

By default, all threads in the target VM are resumed while 
the method is being invoked if they were previously 
suspended by an event or by a command. 
This is done to prevent the deadlocks 
that will occur if any of the threads own monitors 
that will be needed by the invoked method. It is possible that 
breakpoints or other events might occur during the invocation. 
Note, however, that this implicit resume acts exactly like 
the ThreadReference resume command, so if the thread's suspend 
count is greater than 1, it will remain in a suspended state 
during the invocation. By default, when the invocation completes, 
all threads in the target VM are suspended, regardless their state 
before the invocation. 

The resumption of other threads during the invoke can be prevented 
by specifying the INVOKE_SINGLE_THREADED 
bit flag in the options field; however, 
there is no protection against or recovery from the deadlocks 
described above, so this option should be used with great caution. 
Only the specified thread will be resumed (as described for all 
threads above). Upon completion of a single threaded invoke, the invoking thread 
will be suspended once again. Note that any threads started during 
the single threaded invocation will not be suspended when the 
invocation completes. 

If the target VM is disconnected during the invoke (for example, through 
the VirtualMachine dispose command) the method invocation continues. 
/**
         * Invokes a static method. 
         * The method must not be a static initializer. 
         * The method must be a member of the interface type. 
         * <p>Since JDWP version 1.8 
         * <p>
         * The method invocation will occur in the specified thread. 
         * Method invocation can occur only if the specified thread 
         * has been suspended by an event. 
         * Method invocation is not supported 
         * when the target VM has been suspended by the front-end. 
         * <p>
         * The specified method is invoked with the arguments in the specified 
         * argument list. 
         * The method invocation is synchronous; the reply packet is not 
         * sent until the invoked method returns in the target VM. 
         * The return value (possibly the void value) is 
         * included in the reply packet. 
         * If the invoked method throws an exception, the 
         * exception object ID is set in the reply packet; otherwise, the 
         * exception object ID is null. 
         * <p>
         * For primitive arguments, the argument value's type must match the 
         * argument's type exactly. For object arguments, there must exist a 
         * widening reference conversion from the argument value's type to the 
         * argument's type and the argument's type must be loaded. 
         * <p>
         * By default, all threads in the target VM are resumed while 
         * the method is being invoked if they were previously 
         * suspended by an event or by a command. 
         * This is done to prevent the deadlocks 
         * that will occur if any of the threads own monitors 
         * that will be needed by the invoked method. It is possible that 
         * breakpoints or other events might occur during the invocation. 
         * Note, however, that this implicit resume acts exactly like 
         * the ThreadReference resume command, so if the thread's suspend 
         * count is greater than 1, it will remain in a suspended state 
         * during the invocation. By default, when the invocation completes, 
         * all threads in the target VM are suspended, regardless their state 
         * before the invocation. 
         * <p>
         * The resumption of other threads during the invoke can be prevented 
         * by specifying the INVOKE_SINGLE_THREADED 
         * bit flag in the <code>options</code> field; however, 
         * there is no protection against or recovery from the deadlocks 
         * described above, so this option should be used with great caution. 
         * Only the specified thread will be resumed (as described for all 
         * threads above). Upon completion of a single threaded invoke, the invoking thread 
         * will be suspended once again. Note that any threads started during 
         * the single threaded invocation will not be suspended when the 
         * invocation completes. 
         * <p>
         * If the target VM is disconnected during the invoke (for example, through 
         * the VirtualMachine dispose command) the method invocation continues. 
         */
        static class InvokeMethod {
            static final int COMMAND = 1;

            static InvokeMethod process(VirtualMachineImpl vm, 
                                InterfaceTypeImpl clazz, 
                                ThreadReferenceImpl thread, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, clazz, thread, methodID, arguments, options);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                InterfaceTypeImpl clazz, 
                                ThreadReferenceImpl thread, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.InterfaceType.InvokeMethod"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 clazz(InterfaceTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                }
                ps.writeClassRef(clazz.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arguments(ValueImpl[]): " + "");
                }
                ps.writeInt(arguments.length);
                for (int i = 0; i < arguments.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     arguments[i](ValueImpl): " + arguments[i]);
                    }
                    ps.writeValue(arguments[i]);
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 options(int): " + options);
                }
                ps.writeInt(options);
                ps.send();
                return ps;
            }

            static InvokeMethod waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new InvokeMethod(vm, ps);
            }


            The returned value.
/**
             * The returned value.
             */
            final ValueImpl returnValue;

            The thrown exception.
/**
             * The thrown exception.
             */
            final ObjectReferenceImpl exception;

            private InvokeMethod(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.InterfaceType.InvokeMethod"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                returnValue = ps.readValue();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "returnValue(ValueImpl): " + returnValue);
                }
                exception = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "exception(ObjectReferenceImpl): " + (exception==null?"NULL":"ref="+exception.ref()));
                }
            }
        }
    }

    static class Method {
        static final int COMMAND_SET = 6;
        private Method() {}  // hide constructor

        Returns line number information for the method, if present. 
The line table maps source line numbers to the initial code index 
of the line. The line table 
is ordered by code index (from lowest to highest). The line number 
information is constant unless a new class definition is installed 
using RedefineClasses.
/**
         * Returns line number information for the method, if present. 
         * The line table maps source line numbers to the initial code index 
         * of the line. The line table 
         * is ordered by code index (from lowest to highest). The line number 
         * information is constant unless a new class definition is installed 
         * using <a href="#JDWP_VirtualMachine_RedefineClasses">RedefineClasses</a>.
         */
        static class LineTable {
            static final int COMMAND = 1;

            static LineTable process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, methodID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.Method.LineTable"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                ps.send();
                return ps;
            }

            static LineTable waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new LineTable(vm, ps);
            }

            static class LineInfo {

                Initial code index of the line, 
start <= lineCodeIndex < end
/**
                 * Initial code index of the line, 
                 * start &lt;= lineCodeIndex &lt; end
                 */
                final long lineCodeIndex;

                Line number.
/**
                 * Line number.
                 */
                final int lineNumber;

                private LineInfo(VirtualMachineImpl vm, PacketStream ps) {
                    lineCodeIndex = ps.readLong();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "lineCodeIndex(long): " + lineCodeIndex);
                    }
                    lineNumber = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "lineNumber(int): " + lineNumber);
                    }
                }
            }


            Lowest valid code index for the method, >=0, or -1 if the method is native 
/**
             * Lowest valid code index for the method, >=0, or -1 if the method is native 
             */
            final long start;

            Highest valid code index for the method, >=0, or -1 if the method is native
/**
             * Highest valid code index for the method, >=0, or -1 if the method is native
             */
            final long end;

            The number of entries in the line table for this method.
/**
             * The number of entries in the line table for this method.
             */
            final LineInfo[] lines;

            private LineTable(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.Method.LineTable"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                start = ps.readLong();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "start(long): " + start);
                }
                end = ps.readLong();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "end(long): " + end);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "lines(LineInfo[]): " + "");
                }
                int linesCount = ps.readInt();
                lines = new LineInfo[linesCount];
                for (int i = 0; i < linesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "lines[i](LineInfo): " + "");
                    }
                    lines[i] = new LineInfo(vm, ps);
                }
            }
        }

        Returns variable information for the method. The variable table 
includes arguments and locals declared within the method. For 
instance methods, the "this" reference is included in the 
table. Also, synthetic variables may be present. 
/**
         * Returns variable information for the method. The variable table 
         * includes arguments and locals declared within the method. For 
         * instance methods, the "this" reference is included in the 
         * table. Also, synthetic variables may be present. 
         */
        static class VariableTable {
            static final int COMMAND = 2;

            static VariableTable process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, methodID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.Method.VariableTable"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                ps.send();
                return ps;
            }

            static VariableTable waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new VariableTable(vm, ps);
            }

            Information about the variable.
/**
             * Information about the variable.
             */
            static class SlotInfo {

                First code index at which the variable is visible (unsigned). 
Used in conjunction with length. 
The variable can be get or set only when the current 
codeIndex <= current frame code index < codeIndex + length 
/**
                 * First code index at which the variable is visible (unsigned). 
                 * Used in conjunction with <code>length</code>. 
                 * The variable can be get or set only when the current 
                 * <code>codeIndex</code> &lt;= current frame code index &lt; <code>codeIndex + length</code> 
                 */
                final long codeIndex;

                The variable's name.
/**
                 * The variable's name.
                 */
                final String name;

                The variable type's JNI signature.
/**
                 * The variable type's JNI signature.
                 */
                final String signature;

                Unsigned value used in conjunction with codeIndex. 
The variable can be get or set only when the current 
codeIndex <= current frame code index < code index + length 
/**
                 * Unsigned value used in conjunction with <code>codeIndex</code>. 
                 * The variable can be get or set only when the current 
                 * <code>codeIndex</code> &lt;= current frame code index &lt; <code>code index + length</code> 
                 */
                final int length;

                The local variable's index in its frame
/**
                 * The local variable's index in its frame
                 */
                final int slot;

                private SlotInfo(VirtualMachineImpl vm, PacketStream ps) {
                    codeIndex = ps.readLong();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "codeIndex(long): " + codeIndex);
                    }
                    name = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "name(String): " + name);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    length = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "length(int): " + length);
                    }
                    slot = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "slot(int): " + slot);
                    }
                }
            }


            The number of words in the frame used by arguments. 
Eight-byte arguments use two words; all others use one. 
/**
             * The number of words in the frame used by arguments. 
             * Eight-byte arguments use two words; all others use one. 
             */
            final int argCnt;

            The number of variables.
/**
             * The number of variables.
             */
            final SlotInfo[] slots;

            private VariableTable(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.Method.VariableTable"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                argCnt = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "argCnt(int): " + argCnt);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "slots(SlotInfo[]): " + "");
                }
                int slotsCount = ps.readInt();
                slots = new SlotInfo[slotsCount];
                for (int i = 0; i < slotsCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "slots[i](SlotInfo): " + "");
                    }
                    slots[i] = new SlotInfo(vm, ps);
                }
            }
        }

        Retrieve the method's bytecodes as defined in 
The Java Virtual Machine Specification. 
Requires canGetBytecodes capability - see 
CapabilitiesNew.
/**
         * Retrieve the method's bytecodes as defined in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * Requires canGetBytecodes capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class Bytecodes {
            static final int COMMAND = 3;

            static Bytecodes process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, methodID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.Method.Bytecodes"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                ps.send();
                return ps;
            }

            static Bytecodes waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Bytecodes(vm, ps);
            }


            final byte[] bytes;

            private Bytecodes(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.Method.Bytecodes"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "bytes(byte[]): " + "");
                }
                int bytesCount = ps.readInt();
                bytes = new byte[bytesCount];
                for (int i = 0; i < bytesCount; i++) {;
                    bytes[i] = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "bytes[i](byte): " + bytes[i]);
                    }
                }
            }
        }

        Determine if this method is obsolete. A method is obsolete if it has been replaced 
by a non-equivalent method using the 
RedefineClasses command. 
The original and redefined methods are considered equivalent if their bytecodes are 
the same except for indices into the constant pool and the referenced constants are 
equal.
/**
         * Determine if this method is obsolete. A method is obsolete if it has been replaced 
         * by a non-equivalent method using the 
         * <a href="#JDWP_VirtualMachine_RedefineClasses">RedefineClasses</a> command. 
         * The original and redefined methods are considered equivalent if their bytecodes are 
         * the same except for indices into the constant pool and the referenced constants are 
         * equal.
         */
        static class IsObsolete {
            static final int COMMAND = 4;

            static IsObsolete process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, methodID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.Method.IsObsolete"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                ps.send();
                return ps;
            }

            static IsObsolete waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new IsObsolete(vm, ps);
            }


            true if this method has been replaced
by a non-equivalent method using
the RedefineClasses command.
/**
             * true if this method has been replaced
             * by a non-equivalent method using
             * the RedefineClasses command.
             */
            final boolean isObsolete;

            private IsObsolete(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.Method.IsObsolete"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                isObsolete = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "isObsolete(boolean): " + isObsolete);
                }
            }
        }

        Returns variable information for the method, including 
generic signatures for the variables. The variable table 
includes arguments and locals declared within the method. For 
instance methods, the "this" reference is included in the 
table. Also, synthetic variables may be present. 
Generic signatures are described in the signature attribute 
section in 
The Java Virtual Machine Specification. 
Since JDWP version 1.5.
/**
         * Returns variable information for the method, including 
         * generic signatures for the variables. The variable table 
         * includes arguments and locals declared within the method. For 
         * instance methods, the "this" reference is included in the 
         * table. Also, synthetic variables may be present. 
         * Generic signatures are described in the signature attribute 
         * section in 
         * <cite>The Java Virtual Machine Specification</cite>. 
         * Since JDWP version 1.5.
         */
        static class VariableTableWithGeneric {
            static final int COMMAND = 5;

            static VariableTableWithGeneric process(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, refType, methodID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ReferenceTypeImpl refType, 
                                long methodID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.Method.VariableTableWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 refType(ReferenceTypeImpl): " + (refType==null?"NULL":"ref="+refType.ref()));
                }
                ps.writeClassRef(refType.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                ps.send();
                return ps;
            }

            static VariableTableWithGeneric waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new VariableTableWithGeneric(vm, ps);
            }

            Information about the variable.
/**
             * Information about the variable.
             */
            static class SlotInfo {

                First code index at which the variable is visible (unsigned). 
Used in conjunction with length. 
The variable can be get or set only when the current 
codeIndex <= current frame code index < codeIndex + length 
/**
                 * First code index at which the variable is visible (unsigned). 
                 * Used in conjunction with <code>length</code>. 
                 * The variable can be get or set only when the current 
                 * <code>codeIndex</code> &lt;= current frame code index &lt; <code>codeIndex + length</code> 
                 */
                final long codeIndex;

                The variable's name.
/**
                 * The variable's name.
                 */
                final String name;

                The variable type's JNI signature.
/**
                 * The variable type's JNI signature.
                 */
                final String signature;

                The variable type's generic 
signature or an empty string if there is none.
/**
                 * The variable type's generic 
                 * signature or an empty string if there is none.
                 */
                final String genericSignature;

                Unsigned value used in conjunction with codeIndex. 
The variable can be get or set only when the current 
codeIndex <= current frame code index < code index + length 
/**
                 * Unsigned value used in conjunction with <code>codeIndex</code>. 
                 * The variable can be get or set only when the current 
                 * <code>codeIndex</code> &lt;= current frame code index &lt; <code>code index + length</code> 
                 */
                final int length;

                The local variable's index in its frame
/**
                 * The local variable's index in its frame
                 */
                final int slot;

                private SlotInfo(VirtualMachineImpl vm, PacketStream ps) {
                    codeIndex = ps.readLong();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "codeIndex(long): " + codeIndex);
                    }
                    name = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "name(String): " + name);
                    }
                    signature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "signature(String): " + signature);
                    }
                    genericSignature = ps.readString();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "genericSignature(String): " + genericSignature);
                    }
                    length = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "length(int): " + length);
                    }
                    slot = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "slot(int): " + slot);
                    }
                }
            }


            The number of words in the frame used by arguments. 
Eight-byte arguments use two words; all others use one. 
/**
             * The number of words in the frame used by arguments. 
             * Eight-byte arguments use two words; all others use one. 
             */
            final int argCnt;

            The number of variables.
/**
             * The number of variables.
             */
            final SlotInfo[] slots;

            private VariableTableWithGeneric(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.Method.VariableTableWithGeneric"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                argCnt = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "argCnt(int): " + argCnt);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "slots(SlotInfo[]): " + "");
                }
                int slotsCount = ps.readInt();
                slots = new SlotInfo[slotsCount];
                for (int i = 0; i < slotsCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "slots[i](SlotInfo): " + "");
                    }
                    slots[i] = new SlotInfo(vm, ps);
                }
            }
        }
    }

    static class Field {
        static final int COMMAND_SET = 8;
        private Field() {}  // hide constructor
    }

    static class ObjectReference {
        static final int COMMAND_SET = 9;
        private ObjectReference() {}  // hide constructor

        Returns the runtime type of the object. 
The runtime type will be a class or an array. 
/**
         * Returns the runtime type of the object. 
         * The runtime type will be a class or an array. 
         */
        static class ReferenceType {
            static final int COMMAND = 1;

            static ReferenceType process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.ReferenceType"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                ps.send();
                return ps;
            }

            static ReferenceType waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ReferenceType(vm, ps);
            }


            Kind 
of following reference type. 
/**
             * <a href="#JDWP_TypeTag">Kind</a> 
             * of following reference type. 
             */
            final byte refTypeTag;

            The runtime reference type.
/**
             * The runtime reference type.
             */
            final long typeID;

            private ReferenceType(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.ReferenceType"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                refTypeTag = ps.readByte();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "refTypeTag(byte): " + refTypeTag);
                }
                typeID = ps.readClassRef();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "typeID(long): " + "ref="+typeID);
                }
            }
        }

        Returns the value of one or more instance fields. 
Each field must be member of the object's type 
or one of its superclasses, superinterfaces, or implemented interfaces. 
Access control is not enforced; for example, the values of private 
fields can be obtained.
/**
         * Returns the value of one or more instance fields. 
         * Each field must be member of the object's type 
         * or one of its superclasses, superinterfaces, or implemented interfaces. 
         * Access control is not enforced; for example, the values of private 
         * fields can be obtained.
         */
        static class GetValues {
            static final int COMMAND = 2;

            static class Field {

                Field to get.
/**
                 * Field to get.
                 */
                final long fieldID;

                Field(long fieldID) {
                    this.fieldID = fieldID;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     fieldID(long): " + fieldID);
                    }
                    ps.writeFieldRef(fieldID);
                }
            }

            static GetValues process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                Field[] fields)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object, fields);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                Field[] fields) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 fields(Field[]): " + "");
                }
                ps.writeInt(fields.length);
                for (int i = 0; i < fields.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     fields[i](Field): " + "");
                    }
                    fields[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static GetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new GetValues(vm, ps);
            }


            The number of values returned, always equal to 'fields', 
the number of values to get. Field values are ordered 
in the reply in the same order as corresponding fieldIDs 
in the command.
/**
             * The number of values returned, always equal to 'fields', 
             * the number of values to get. Field values are ordered 
             * in the reply in the same order as corresponding fieldIDs 
             * in the command.
             */
            final ValueImpl[] values;

            private GetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "values(ValueImpl[]): " + "");
                }
                int valuesCount = ps.readInt();
                values = new ValueImpl[valuesCount];
                for (int i = 0; i < valuesCount; i++) {;
                    values[i] = ps.readValue();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "values[i](ValueImpl): " + values[i]);
                    }
                }
            }
        }

        Sets the value of one or more instance fields. 
Each field must be member of the object's type 
or one of its superclasses, superinterfaces, or implemented interfaces. 
Access control is not enforced; for example, the values of private 
fields can be set. 
For primitive values, the value's type must match the 
field's type exactly. For object values, there must be a 
widening reference conversion from the value's type to the
field's type and the field's type must be loaded. 
/**
         * Sets the value of one or more instance fields. 
         * Each field must be member of the object's type 
         * or one of its superclasses, superinterfaces, or implemented interfaces. 
         * Access control is not enforced; for example, the values of private 
         * fields can be set. 
         * For primitive values, the value's type must match the 
         * field's type exactly. For object values, there must be a 
         * widening reference conversion from the value's type to the
         * field's type and the field's type must be loaded. 
         */
        static class SetValues {
            static final int COMMAND = 3;

            A Field/Value pair.
/**
             * A Field/Value pair.
             */
            static class FieldValue {

                Field to set.
/**
                 * Field to set.
                 */
                final long fieldID;

                Value to put in the field.
/**
                 * Value to put in the field.
                 */
                final ValueImpl value;

                FieldValue(long fieldID, ValueImpl value) {
                    this.fieldID = fieldID;
                    this.value = value;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     fieldID(long): " + fieldID);
                    }
                    ps.writeFieldRef(fieldID);
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     value(ValueImpl): " + value);
                    }
                    ps.writeUntaggedValue(value);
                }
            }

            static SetValues process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                FieldValue[] values)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object, values);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                FieldValue[] values) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 values(FieldValue[]): " + "");
                }
                ps.writeInt(values.length);
                for (int i = 0; i < values.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     values[i](FieldValue): " + "");
                    }
                    values[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static SetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SetValues(vm, ps);
            }


            private SetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Returns monitor information for an object. All threads int the VM must 
be suspended.
Requires canGetMonitorInfo capability - see 
CapabilitiesNew.
/**
         * Returns monitor information for an object. All threads int the VM must 
         * be suspended.
         * Requires canGetMonitorInfo capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class MonitorInfo {
            static final int COMMAND = 5;

            static MonitorInfo process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.MonitorInfo"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                ps.send();
                return ps;
            }

            static MonitorInfo waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new MonitorInfo(vm, ps);
            }


            The monitor owner, or null if it is not currently owned.
/**
             * The monitor owner, or null if it is not currently owned.
             */
            final ThreadReferenceImpl owner;

            The number of times the monitor has been entered.
/**
             * The number of times the monitor has been entered.
             */
            final int entryCount;

            The number of threads that are waiting for the monitor 
0 if there is no current owner
/**
             * The number of threads that are waiting for the monitor 
             * 0 if there is no current owner
             */
            final ThreadReferenceImpl[] waiters;

            private MonitorInfo(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.MonitorInfo"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                owner = ps.readThreadReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "owner(ThreadReferenceImpl): " + (owner==null?"NULL":"ref="+owner.ref()));
                }
                entryCount = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "entryCount(int): " + entryCount);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "waiters(ThreadReferenceImpl[]): " + "");
                }
                int waitersCount = ps.readInt();
                waiters = new ThreadReferenceImpl[waitersCount];
                for (int i = 0; i < waitersCount; i++) {;
                    waiters[i] = ps.readThreadReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "waiters[i](ThreadReferenceImpl): " + (waiters[i]==null?"NULL":"ref="+waiters[i].ref()));
                    }
                }
            }
        }

        Invokes a instance method. 
The method must be member of the object's type 
or one of its superclasses, superinterfaces, or implemented interfaces. 
Access control is not enforced; for example, private 
methods can be invoked.

The method invocation will occur in the specified thread. 
Method invocation can occur only if the specified thread 
has been suspended by an event. 
Method invocation is not supported 
when the target VM has been suspended by the front-end. 

The specified method is invoked with the arguments in the specified 
argument list. 
The method invocation is synchronous; the reply packet is not 
sent until the invoked method returns in the target VM. 
The return value (possibly the void value) is 
included in the reply packet. 
If the invoked method throws an exception, the 
exception object ID is set in the reply packet; otherwise, the 
exception object ID is null. 

For primitive arguments, the argument value's type must match the 
argument's type exactly. For object arguments, there must be a 
widening reference conversion from the argument value's type to the 
argument's type and the argument's type must be loaded. 

By default, all threads in the target VM are resumed while 
the method is being invoked if they were previously 
suspended by an event or by a command. 
This is done to prevent the deadlocks 
that will occur if any of the threads own monitors 
that will be needed by the invoked method. It is possible that 
breakpoints or other events might occur during the invocation. 
Note, however, that this implicit resume acts exactly like 
the ThreadReference resume command, so if the thread's suspend 
count is greater than 1, it will remain in a suspended state 
during the invocation. By default, when the invocation completes, 
all threads in the target VM are suspended, regardless their state 
before the invocation. 

The resumption of other threads during the invoke can be prevented 
by specifying the INVOKE_SINGLE_THREADED 
bit flag in the options field; however, 
there is no protection against or recovery from the deadlocks 
described above, so this option should be used with great caution. 
Only the specified thread will be resumed (as described for all 
threads above). Upon completion of a single threaded invoke, the invoking thread 
will be suspended once again. Note that any threads started during 
the single threaded invocation will not be suspended when the 
invocation completes. 

If the target VM is disconnected during the invoke (for example, through 
the VirtualMachine dispose command) the method invocation continues. 
/**
         * Invokes a instance method. 
         * The method must be member of the object's type 
         * or one of its superclasses, superinterfaces, or implemented interfaces. 
         * Access control is not enforced; for example, private 
         * methods can be invoked.
         * <p>
         * The method invocation will occur in the specified thread. 
         * Method invocation can occur only if the specified thread 
         * has been suspended by an event. 
         * Method invocation is not supported 
         * when the target VM has been suspended by the front-end. 
         * <p>
         * The specified method is invoked with the arguments in the specified 
         * argument list. 
         * The method invocation is synchronous; the reply packet is not 
         * sent until the invoked method returns in the target VM. 
         * The return value (possibly the void value) is 
         * included in the reply packet. 
         * If the invoked method throws an exception, the 
         * exception object ID is set in the reply packet; otherwise, the 
         * exception object ID is null. 
         * <p>
         * For primitive arguments, the argument value's type must match the 
         * argument's type exactly. For object arguments, there must be a 
         * widening reference conversion from the argument value's type to the 
         * argument's type and the argument's type must be loaded. 
         * <p>
         * By default, all threads in the target VM are resumed while 
         * the method is being invoked if they were previously 
         * suspended by an event or by a command. 
         * This is done to prevent the deadlocks 
         * that will occur if any of the threads own monitors 
         * that will be needed by the invoked method. It is possible that 
         * breakpoints or other events might occur during the invocation. 
         * Note, however, that this implicit resume acts exactly like 
         * the ThreadReference resume command, so if the thread's suspend 
         * count is greater than 1, it will remain in a suspended state 
         * during the invocation. By default, when the invocation completes, 
         * all threads in the target VM are suspended, regardless their state 
         * before the invocation. 
         * <p>
         * The resumption of other threads during the invoke can be prevented 
         * by specifying the INVOKE_SINGLE_THREADED 
         * bit flag in the <code>options</code> field; however, 
         * there is no protection against or recovery from the deadlocks 
         * described above, so this option should be used with great caution. 
         * Only the specified thread will be resumed (as described for all 
         * threads above). Upon completion of a single threaded invoke, the invoking thread 
         * will be suspended once again. Note that any threads started during 
         * the single threaded invocation will not be suspended when the 
         * invocation completes. 
         * <p>
         * If the target VM is disconnected during the invoke (for example, through 
         * the VirtualMachine dispose command) the method invocation continues. 
         */
        static class InvokeMethod {
            static final int COMMAND = 6;

            static InvokeMethod process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                ThreadReferenceImpl thread, 
                                ClassTypeImpl clazz, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object, thread, clazz, methodID, arguments, options);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                ThreadReferenceImpl thread, 
                                ClassTypeImpl clazz, 
                                long methodID, 
                                ValueImpl[] arguments, 
                                int options) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.InvokeMethod"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 clazz(ClassTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                }
                ps.writeClassRef(clazz.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 methodID(long): " + methodID);
                }
                ps.writeMethodRef(methodID);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arguments(ValueImpl[]): " + "");
                }
                ps.writeInt(arguments.length);
                for (int i = 0; i < arguments.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     arguments[i](ValueImpl): " + arguments[i]);
                    }
                    ps.writeValue(arguments[i]);
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 options(int): " + options);
                }
                ps.writeInt(options);
                ps.send();
                return ps;
            }

            static InvokeMethod waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new InvokeMethod(vm, ps);
            }


            The returned value, or null if an exception is thrown.
/**
             * The returned value, or null if an exception is thrown.
             */
            final ValueImpl returnValue;

            The thrown exception, if any.
/**
             * The thrown exception, if any.
             */
            final ObjectReferenceImpl exception;

            private InvokeMethod(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.InvokeMethod"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                returnValue = ps.readValue();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "returnValue(ValueImpl): " + returnValue);
                }
                exception = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "exception(ObjectReferenceImpl): " + (exception==null?"NULL":"ref="+exception.ref()));
                }
            }
        }

        Prevents garbage collection for the given object. By 
default all objects in back-end replies may be 
collected at any time the target VM is running. A call to 
this command guarantees that the object will not be 
collected. The 
EnableCollection 
command can be used to 
allow collection once again. 

Note that while the target VM is suspended, no garbage 
collection will occur because all threads are suspended. 
The typical examination of variables, fields, and arrays 
during the suspension is safe without explicitly disabling 
garbage collection. 

This method should be used sparingly, as it alters the 
pattern of garbage collection in the target VM and, 
consequently, may result in application behavior under the 
debugger that differs from its non-debugged behavior. 
/**
         * Prevents garbage collection for the given object. By 
         * default all objects in back-end replies may be 
         * collected at any time the target VM is running. A call to 
         * this command guarantees that the object will not be 
         * collected. The 
         * <a href="#JDWP_ObjectReference_EnableCollection">EnableCollection</a> 
         * command can be used to 
         * allow collection once again. 
         * <p>
         * Note that while the target VM is suspended, no garbage 
         * collection will occur because all threads are suspended. 
         * The typical examination of variables, fields, and arrays 
         * during the suspension is safe without explicitly disabling 
         * garbage collection. 
         * <p>
         * This method should be used sparingly, as it alters the 
         * pattern of garbage collection in the target VM and, 
         * consequently, may result in application behavior under the 
         * debugger that differs from its non-debugged behavior. 
         */
        static class DisableCollection {
            static final int COMMAND = 7;

            static DisableCollection process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.DisableCollection"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                ps.send();
                return ps;
            }

            static DisableCollection waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new DisableCollection(vm, ps);
            }


            private DisableCollection(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.DisableCollection"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Permits garbage collection for this object. By default all 
objects returned by JDWP may become unreachable in the target VM, 
and hence may be garbage collected. A call to this command is 
necessary only if garbage collection was previously disabled with 
the DisableCollection 
command.
/**
         * Permits garbage collection for this object. By default all 
         * objects returned by JDWP may become unreachable in the target VM, 
         * and hence may be garbage collected. A call to this command is 
         * necessary only if garbage collection was previously disabled with 
         * the <a href="#JDWP_ObjectReference_DisableCollection">DisableCollection</a> 
         * command.
         */
        static class EnableCollection {
            static final int COMMAND = 8;

            static EnableCollection process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.EnableCollection"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                ps.send();
                return ps;
            }

            static EnableCollection waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new EnableCollection(vm, ps);
            }


            private EnableCollection(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.EnableCollection"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Determines whether an object has been garbage collected in the 
target VM. 
/**
         * Determines whether an object has been garbage collected in the 
         * target VM. 
         */
        static class IsCollected {
            static final int COMMAND = 9;

            static IsCollected process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.IsCollected"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                ps.send();
                return ps;
            }

            static IsCollected waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new IsCollected(vm, ps);
            }


            true if the object has been collected; false otherwise
/**
             * true if the object has been collected; false otherwise
             */
            final boolean isCollected;

            private IsCollected(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.IsCollected"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                isCollected = ps.readBoolean();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "isCollected(boolean): " + isCollected);
                }
            }
        }

        Returns objects that directly reference this object.  
Only objects that are reachable for the purposes 
of garbage collection are returned. 
Note that an object can also be referenced in other ways, 
such as from a local variable in a stack frame, or from a JNI global 
reference.  Such non-object referrers are not returned by this command. 
Since JDWP version 1.6. Requires canGetInstanceInfo capability - see 
CapabilitiesNew.
/**
         * Returns objects that directly reference this object.  
         * Only objects that are reachable for the purposes 
         * of garbage collection are returned. 
         * Note that an object can also be referenced in other ways, 
         * such as from a local variable in a stack frame, or from a JNI global 
         * reference.  Such non-object referrers are not returned by this command. 
         * <p>Since JDWP version 1.6. Requires canGetInstanceInfo capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class ReferringObjects {
            static final int COMMAND = 10;

            static ReferringObjects process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                int maxReferrers)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, object, maxReferrers);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl object, 
                                int maxReferrers) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.ReferringObjects"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                }
                ps.writeObjectRef(object.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 maxReferrers(int): " + maxReferrers);
                }
                ps.writeInt(maxReferrers);
                ps.send();
                return ps;
            }

            static ReferringObjects waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ReferringObjects(vm, ps);
            }


            The number of objects that follow.
/**
             * The number of objects that follow.
             */
            final ObjectReferenceImpl[] referringObjects;

            private ReferringObjects(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ObjectReference.ReferringObjects"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "referringObjects(ObjectReferenceImpl[]): " + "");
                }
                int referringObjectsCount = ps.readInt();
                referringObjects = new ObjectReferenceImpl[referringObjectsCount];
                for (int i = 0; i < referringObjectsCount; i++) {;
                    referringObjects[i] = ps.readTaggedObjectReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "referringObjects[i](ObjectReferenceImpl): " + (referringObjects[i]==null?"NULL":"ref="+referringObjects[i].ref()));
                    }
                }
            }
        }
    }

    static class StringReference {
        static final int COMMAND_SET = 10;
        private StringReference() {}  // hide constructor

        Returns the characters contained in the string. 
/**
         * Returns the characters contained in the string. 
         */
        static class Value {
            static final int COMMAND = 1;

            static Value process(VirtualMachineImpl vm, 
                                ObjectReferenceImpl stringObject)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, stringObject);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ObjectReferenceImpl stringObject) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.StringReference.Value"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 stringObject(ObjectReferenceImpl): " + (stringObject==null?"NULL":"ref="+stringObject.ref()));
                }
                ps.writeObjectRef(stringObject.ref());
                ps.send();
                return ps;
            }

            static Value waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Value(vm, ps);
            }


            UTF-8 representation of the string value.
/**
             * UTF-8 representation of the string value.
             */
            final String stringValue;

            private Value(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.StringReference.Value"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                stringValue = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "stringValue(String): " + stringValue);
                }
            }
        }
    }

    static class ThreadReference {
        static final int COMMAND_SET = 11;
        private ThreadReference() {}  // hide constructor

        Returns the thread name. 
/**
         * Returns the thread name. 
         */
        static class Name {
            static final int COMMAND = 1;

            static Name process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Name"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static Name waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Name(vm, ps);
            }


            The thread name.
/**
             * The thread name.
             */
            final String threadName;

            private Name(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Name"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                threadName = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "threadName(String): " + threadName);
                }
            }
        }

        Suspends the thread. 

Unlike java.lang.Thread.suspend(), suspends of both 
the virtual machine and individual threads are counted. Before 
a thread will run again, it must be resumed the same number 
of times it has been suspended. 

Suspending single threads with command has the same 
dangers java.lang.Thread.suspend(). If the suspended 
thread holds a monitor needed by another running thread, 
deadlock is possible in the target VM (at least until the 
suspended thread is resumed again). 
 The suspended thread is guaranteed to remain suspended until resumed through one of the JDI resume methods mentioned above; the application in the target VM cannot resume the suspended thread through Thread.resume. 

Note that this doesn't change the status of the thread (see the 
ThreadStatus command.) 
For example, if it was 
Running, it will still appear running to other threads. 
/**
         * Suspends the thread. 
         * <p>
         * Unlike java.lang.Thread.suspend(), suspends of both 
         * the virtual machine and individual threads are counted. Before 
         * a thread will run again, it must be resumed the same number 
         * of times it has been suspended. 
         * <p>
         * Suspending single threads with command has the same 
         * dangers java.lang.Thread.suspend(). If the suspended 
         * thread holds a monitor needed by another running thread, 
         * deadlock is possible in the target VM (at least until the 
         * suspended thread is resumed again). 
         * <p>
         * The suspended thread is guaranteed to remain suspended until 
         * resumed through one of the JDI resume methods mentioned above; 
         * the application in the target VM cannot resume the suspended thread 
         * through {@link java.lang.Thread#resume}. 
         * <p>
         * Note that this doesn't change the status of the thread (see the 
         * <a href="#JDWP_ThreadReference_Status">ThreadStatus</a> command.) 
         * For example, if it was 
         * Running, it will still appear running to other threads. 
         */
        static class Suspend {
            static final int COMMAND = 2;

            static Suspend process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Suspend"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static Suspend waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Suspend(vm, ps);
            }


            private Suspend(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Suspend"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Resumes the execution of a given thread. If this thread was 
not previously suspended by the front-end, 
calling this command has no effect. 
Otherwise, the count of pending suspends on this thread is 
decremented. If it is decremented to 0, the thread will 
continue to execute. 
/**
         * Resumes the execution of a given thread. If this thread was 
         * not previously suspended by the front-end, 
         * calling this command has no effect. 
         * Otherwise, the count of pending suspends on this thread is 
         * decremented. If it is decremented to 0, the thread will 
         * continue to execute. 
         */
        static class Resume {
            static final int COMMAND = 3;

            static Resume process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Resume"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static Resume waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Resume(vm, ps);
            }


            private Resume(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Resume"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Returns the current status of a thread. The thread status 
reply indicates the thread status the last time it was running. 
the suspend status provides information on the thread's 
suspension, if any.
/**
         * Returns the current status of a thread. The thread status 
         * reply indicates the thread status the last time it was running. 
         * the suspend status provides information on the thread's 
         * suspension, if any.
         */
        static class Status {
            static final int COMMAND = 4;

            static Status process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Status"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static Status waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Status(vm, ps);
            }


            One of the thread status codes 
See JDWP.ThreadStatus
/**
             * One of the thread status codes 
             * See <a href="#JDWP_ThreadStatus">JDWP.ThreadStatus</a>
             */
            final int threadStatus;

            One of the suspend status codes 
See JDWP.SuspendStatus
/**
             * One of the suspend status codes 
             * See <a href="#JDWP_SuspendStatus">JDWP.SuspendStatus</a>
             */
            final int suspendStatus;

            private Status(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Status"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                threadStatus = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "threadStatus(int): " + threadStatus);
                }
                suspendStatus = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "suspendStatus(int): " + suspendStatus);
                }
            }
        }

        Returns the thread group that contains a given thread. 
/**
         * Returns the thread group that contains a given thread. 
         */
        static class ThreadGroup {
            static final int COMMAND = 5;

            static ThreadGroup process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.ThreadGroup"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static ThreadGroup waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ThreadGroup(vm, ps);
            }


            The thread group of this thread. 
/**
             * The thread group of this thread. 
             */
            final ThreadGroupReferenceImpl group;

            private ThreadGroup(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.ThreadGroup"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                group = ps.readThreadGroupReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "group(ThreadGroupReferenceImpl): " + (group==null?"NULL":"ref="+group.ref()));
                }
            }
        }

        Returns the current call stack of a suspended thread. 
The sequence of frames starts with 
the currently executing frame, followed by its caller, 
and so on. The thread must be suspended, and the returned 
frameID is valid only while the thread is suspended. 
/**
         * Returns the current call stack of a suspended thread. 
         * The sequence of frames starts with 
         * the currently executing frame, followed by its caller, 
         * and so on. The thread must be suspended, and the returned 
         * frameID is valid only while the thread is suspended. 
         */
        static class Frames {
            static final int COMMAND = 6;

            static Frames process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                int startFrame, 
                                int length)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, startFrame, length);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                int startFrame, 
                                int length) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Frames"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 startFrame(int): " + startFrame);
                }
                ps.writeInt(startFrame);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 length(int): " + length);
                }
                ps.writeInt(length);
                ps.send();
                return ps;
            }

            static Frames waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Frames(vm, ps);
            }

            static class Frame {

                The ID of this frame. 
/**
                 * The ID of this frame. 
                 */
                final long frameID;

                The current location of this frame
/**
                 * The current location of this frame
                 */
                final Location location;

                private Frame(VirtualMachineImpl vm, PacketStream ps) {
                    frameID = ps.readFrameRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "frameID(long): " + frameID);
                    }
                    location = ps.readLocation();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "location(Location): " + location);
                    }
                }
            }


            The number of frames retreived
/**
             * The number of frames retreived
             */
            final Frame[] frames;

            private Frames(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Frames"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "frames(Frame[]): " + "");
                }
                int framesCount = ps.readInt();
                frames = new Frame[framesCount];
                for (int i = 0; i < framesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "frames[i](Frame): " + "");
                    }
                    frames[i] = new Frame(vm, ps);
                }
            }
        }

        Returns the count of frames on this thread's stack. 
The thread must be suspended, and the returned 
count is valid only while the thread is suspended. 
Returns JDWP.Error.errorThreadNotSuspended if not suspended. 
/**
         * Returns the count of frames on this thread's stack. 
         * The thread must be suspended, and the returned 
         * count is valid only while the thread is suspended. 
         * Returns JDWP.Error.errorThreadNotSuspended if not suspended. 
         */
        static class FrameCount {
            static final int COMMAND = 7;

            static FrameCount process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.FrameCount"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static FrameCount waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new FrameCount(vm, ps);
            }


            The count of frames on this thread's stack. 
/**
             * The count of frames on this thread's stack. 
             */
            final int frameCount;

            private FrameCount(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.FrameCount"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                frameCount = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "frameCount(int): " + frameCount);
                }
            }
        }

        Returns the objects whose monitors have been entered by this thread. 
The thread must be suspended, and the returned information is 
relevant only while the thread is suspended. 
Requires canGetOwnedMonitorInfo capability - see 
CapabilitiesNew.
/**
         * Returns the objects whose monitors have been entered by this thread. 
         * The thread must be suspended, and the returned information is 
         * relevant only while the thread is suspended. 
         * Requires canGetOwnedMonitorInfo capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class OwnedMonitors {
            static final int COMMAND = 8;

            static OwnedMonitors process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.OwnedMonitors"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static OwnedMonitors waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new OwnedMonitors(vm, ps);
            }


            The number of owned monitors
/**
             * The number of owned monitors
             */
            final ObjectReferenceImpl[] owned;

            private OwnedMonitors(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.OwnedMonitors"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "owned(ObjectReferenceImpl[]): " + "");
                }
                int ownedCount = ps.readInt();
                owned = new ObjectReferenceImpl[ownedCount];
                for (int i = 0; i < ownedCount; i++) {;
                    owned[i] = ps.readTaggedObjectReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "owned[i](ObjectReferenceImpl): " + (owned[i]==null?"NULL":"ref="+owned[i].ref()));
                    }
                }
            }
        }

        Returns the object, if any, for which this thread is waiting. The 
thread may be waiting to enter a monitor, or it may be waiting, via 
the java.lang.Object.wait method, for another thread to invoke the 
notify method. 
The thread must be suspended, and the returned information is 
relevant only while the thread is suspended. 
Requires canGetCurrentContendedMonitor capability - see 
CapabilitiesNew.
/**
         * Returns the object, if any, for which this thread is waiting. The 
         * thread may be waiting to enter a monitor, or it may be waiting, via 
         * the java.lang.Object.wait method, for another thread to invoke the 
         * notify method. 
         * The thread must be suspended, and the returned information is 
         * relevant only while the thread is suspended. 
         * Requires canGetCurrentContendedMonitor capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class CurrentContendedMonitor {
            static final int COMMAND = 9;

            static CurrentContendedMonitor process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.CurrentContendedMonitor"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static CurrentContendedMonitor waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new CurrentContendedMonitor(vm, ps);
            }


            The contended monitor, or null if 
there is no current contended monitor. 
/**
             * The contended monitor, or null if 
             * there is no current contended monitor. 
             */
            final ObjectReferenceImpl monitor;

            private CurrentContendedMonitor(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.CurrentContendedMonitor"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                monitor = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "monitor(ObjectReferenceImpl): " + (monitor==null?"NULL":"ref="+monitor.ref()));
                }
            }
        }

        Stops the thread with an asynchronous exception. 
/**
         * Stops the thread with an asynchronous exception. 
         */
        static class Stop {
            static final int COMMAND = 10;

            static Stop process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                ObjectReferenceImpl throwable)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, throwable);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                ObjectReferenceImpl throwable) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Stop"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 throwable(ObjectReferenceImpl): " + (throwable==null?"NULL":"ref="+throwable.ref()));
                }
                ps.writeObjectRef(throwable.ref());
                ps.send();
                return ps;
            }

            static Stop waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Stop(vm, ps);
            }


            private Stop(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Stop"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Interrupt the thread, as if done by java.lang.Thread.interrupt 
/**
         * Interrupt the thread, as if done by java.lang.Thread.interrupt 
         */
        static class Interrupt {
            static final int COMMAND = 11;

            static Interrupt process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Interrupt"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static Interrupt waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Interrupt(vm, ps);
            }


            private Interrupt(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.Interrupt"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Get the suspend count for this thread. The suspend count is the  
number of times the thread has been suspended through the 
thread-level or VM-level suspend commands without a corresponding resume 
/**
         * Get the suspend count for this thread. The suspend count is the  
         * number of times the thread has been suspended through the 
         * thread-level or VM-level suspend commands without a corresponding resume 
         */
        static class SuspendCount {
            static final int COMMAND = 12;

            static SuspendCount process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.SuspendCount"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static SuspendCount waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SuspendCount(vm, ps);
            }


            The number of outstanding suspends of this thread. 
/**
             * The number of outstanding suspends of this thread. 
             */
            final int suspendCount;

            private SuspendCount(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.SuspendCount"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                suspendCount = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "suspendCount(int): " + suspendCount);
                }
            }
        }

        Returns monitor objects owned by the thread, along with stack depth at which 
the monitor was acquired. Returns stack depth of -1  if 
the implementation cannot determine the stack depth 
(e.g., for monitors acquired by JNI MonitorEnter).
The thread must be suspended, and the returned information is 
relevant only while the thread is suspended. 
Requires canGetMonitorFrameInfo capability - see 
CapabilitiesNew. 
Since JDWP version 1.6. 
/**
         * Returns monitor objects owned by the thread, along with stack depth at which 
         * the monitor was acquired. Returns stack depth of -1  if 
         * the implementation cannot determine the stack depth 
         * (e.g., for monitors acquired by JNI MonitorEnter).
         * The thread must be suspended, and the returned information is 
         * relevant only while the thread is suspended. 
         * Requires canGetMonitorFrameInfo capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>. 
         * <p>Since JDWP version 1.6. 
         */
        static class OwnedMonitorsStackDepthInfo {
            static final int COMMAND = 13;

            static OwnedMonitorsStackDepthInfo process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.OwnedMonitorsStackDepthInfo"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                ps.send();
                return ps;
            }

            static OwnedMonitorsStackDepthInfo waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new OwnedMonitorsStackDepthInfo(vm, ps);
            }

            static class monitor {

                An owned monitor
/**
                 * An owned monitor
                 */
                final ObjectReferenceImpl monitor;

                Stack depth location where monitor was acquired
/**
                 * Stack depth location where monitor was acquired
                 */
                final int stack_depth;

                private monitor(VirtualMachineImpl vm, PacketStream ps) {
                    monitor = ps.readTaggedObjectReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "monitor(ObjectReferenceImpl): " + (monitor==null?"NULL":"ref="+monitor.ref()));
                    }
                    stack_depth = ps.readInt();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "stack_depth(int): " + stack_depth);
                    }
                }
            }


            The number of owned monitors
/**
             * The number of owned monitors
             */
            final monitor[] owned;

            private OwnedMonitorsStackDepthInfo(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.OwnedMonitorsStackDepthInfo"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "owned(monitor[]): " + "");
                }
                int ownedCount = ps.readInt();
                owned = new monitor[ownedCount];
                for (int i = 0; i < ownedCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "owned[i](monitor): " + "");
                    }
                    owned[i] = new monitor(vm, ps);
                }
            }
        }

        Force a method to return before it reaches a return 
statement.  

The method which will return early is referred to as the 
called method. The called method is the current method (as 
defined by the Frames section in 
The Java Virtual Machine Specification) 
for the specified thread at the time this command 
is received. 

The specified thread must be suspended. 
The return occurs when execution of Java programming 
language code is resumed on this thread. Between sending this 
command and resumption of thread execution, the 
state of the stack is undefined. 

No further instructions are executed in the called 
method. Specifically, finally blocks are not executed. Note: 
this can cause inconsistent states in the application. 

A lock acquired by calling the called method (if it is a 
synchronized method) and locks acquired by entering 
synchronized blocks within the called method are 
released. Note: this does not apply to JNI locks or 
java.util.concurrent.locks locks. 

Events, such as MethodExit, are generated as they would be in 
a normal return. 

The called method must be a non-native Java programming 
language method. Forcing return on a thread with only one 
frame on the stack causes the thread to exit when resumed. 

For void methods, the value must be a void value. 
For methods that return primitive values, the value's type must 
match the return type exactly.  For object values, there must be a 
widening reference conversion from the value's type to the 
return type type and the return type must be loaded. 

Since JDWP version 1.6. Requires canForceEarlyReturn capability - see 
CapabilitiesNew.
/**
         * Force a method to return before it reaches a return 
         * statement.  
         * <p>
         * The method which will return early is referred to as the 
         * called method. The called method is the current method (as 
         * defined by the Frames section in 
         * <cite>The Java Virtual Machine Specification</cite>) 
         * for the specified thread at the time this command 
         * is received. 
         * <p>
         * The specified thread must be suspended. 
         * The return occurs when execution of Java programming 
         * language code is resumed on this thread. Between sending this 
         * command and resumption of thread execution, the 
         * state of the stack is undefined. 
         * <p>
         * No further instructions are executed in the called 
         * method. Specifically, finally blocks are not executed. Note: 
         * this can cause inconsistent states in the application. 
         * <p>
         * A lock acquired by calling the called method (if it is a 
         * synchronized method) and locks acquired by entering 
         * synchronized blocks within the called method are 
         * released. Note: this does not apply to JNI locks or 
         * java.util.concurrent.locks locks. 
         * <p>
         * Events, such as MethodExit, are generated as they would be in 
         * a normal return. 
         * <p>
         * The called method must be a non-native Java programming 
         * language method. Forcing return on a thread with only one 
         * frame on the stack causes the thread to exit when resumed. 
         * <p>
         * For void methods, the value must be a void value. 
         * For methods that return primitive values, the value's type must 
         * match the return type exactly.  For object values, there must be a 
         * widening reference conversion from the value's type to the 
         * return type type and the return type must be loaded. 
         * <p>
         * Since JDWP version 1.6. Requires canForceEarlyReturn capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class ForceEarlyReturn {
            static final int COMMAND = 14;

            static ForceEarlyReturn process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                ValueImpl value)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, value);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                ValueImpl value) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.ForceEarlyReturn"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 value(ValueImpl): " + value);
                }
                ps.writeValue(value);
                ps.send();
                return ps;
            }

            static ForceEarlyReturn waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ForceEarlyReturn(vm, ps);
            }


            private ForceEarlyReturn(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadReference.ForceEarlyReturn"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }
    }

    static class ThreadGroupReference {
        static final int COMMAND_SET = 12;
        private ThreadGroupReference() {}  // hide constructor

        Returns the thread group name. 
/**
         * Returns the thread group name. 
         */
        static class Name {
            static final int COMMAND = 1;

            static Name process(VirtualMachineImpl vm, 
                                ThreadGroupReferenceImpl group)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, group);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadGroupReferenceImpl group) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadGroupReference.Name"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 group(ThreadGroupReferenceImpl): " + (group==null?"NULL":"ref="+group.ref()));
                }
                ps.writeObjectRef(group.ref());
                ps.send();
                return ps;
            }

            static Name waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Name(vm, ps);
            }


            The thread group's name.
/**
             * The thread group's name.
             */
            final String groupName;

            private Name(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadGroupReference.Name"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                groupName = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "groupName(String): " + groupName);
                }
            }
        }

        Returns the thread group, if any, which contains a given thread group. 
/**
         * Returns the thread group, if any, which contains a given thread group. 
         */
        static class Parent {
            static final int COMMAND = 2;

            static Parent process(VirtualMachineImpl vm, 
                                ThreadGroupReferenceImpl group)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, group);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadGroupReferenceImpl group) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadGroupReference.Parent"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 group(ThreadGroupReferenceImpl): " + (group==null?"NULL":"ref="+group.ref()));
                }
                ps.writeObjectRef(group.ref());
                ps.send();
                return ps;
            }

            static Parent waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Parent(vm, ps);
            }


            The parent thread group object, or 
null if the given thread group 
is a top-level thread group
/**
             * The parent thread group object, or 
             * null if the given thread group 
             * is a top-level thread group
             */
            final ThreadGroupReferenceImpl parentGroup;

            private Parent(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadGroupReference.Parent"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                parentGroup = ps.readThreadGroupReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "parentGroup(ThreadGroupReferenceImpl): " + (parentGroup==null?"NULL":"ref="+parentGroup.ref()));
                }
            }
        }

        Returns the live threads and active thread groups directly contained 
in this thread group. Threads and thread groups in child 
thread groups are not included. 
A thread is alive if it has been started and has not yet been stopped. 
See java.lang.ThreadGroup 
for information about active ThreadGroups.
/**
         * Returns the live threads and active thread groups directly contained 
         * in this thread group. Threads and thread groups in child 
         * thread groups are not included. 
         * A thread is alive if it has been started and has not yet been stopped. 
         * See <a href=../../api/java.base/java/lang/ThreadGroup.html>java.lang.ThreadGroup </a>
         * for information about active ThreadGroups.
         */
        static class Children {
            static final int COMMAND = 3;

            static Children process(VirtualMachineImpl vm, 
                                ThreadGroupReferenceImpl group)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, group);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadGroupReferenceImpl group) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ThreadGroupReference.Children"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 group(ThreadGroupReferenceImpl): " + (group==null?"NULL":"ref="+group.ref()));
                }
                ps.writeObjectRef(group.ref());
                ps.send();
                return ps;
            }

            static Children waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Children(vm, ps);
            }


            The number of live child threads. 
/**
             * The number of live child threads. 
             */
            final ThreadReferenceImpl[] childThreads;

            The number of active child thread groups. 
/**
             * The number of active child thread groups. 
             */
            final ThreadGroupReferenceImpl[] childGroups;

            private Children(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ThreadGroupReference.Children"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "childThreads(ThreadReferenceImpl[]): " + "");
                }
                int childThreadsCount = ps.readInt();
                childThreads = new ThreadReferenceImpl[childThreadsCount];
                for (int i = 0; i < childThreadsCount; i++) {;
                    childThreads[i] = ps.readThreadReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "childThreads[i](ThreadReferenceImpl): " + (childThreads[i]==null?"NULL":"ref="+childThreads[i].ref()));
                    }
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "childGroups(ThreadGroupReferenceImpl[]): " + "");
                }
                int childGroupsCount = ps.readInt();
                childGroups = new ThreadGroupReferenceImpl[childGroupsCount];
                for (int i = 0; i < childGroupsCount; i++) {;
                    childGroups[i] = ps.readThreadGroupReference();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "childGroups[i](ThreadGroupReferenceImpl): " + (childGroups[i]==null?"NULL":"ref="+childGroups[i].ref()));
                    }
                }
            }
        }
    }

    static class ArrayReference {
        static final int COMMAND_SET = 13;
        private ArrayReference() {}  // hide constructor

        Returns the number of components in a given array. 
/**
         * Returns the number of components in a given array. 
         */
        static class Length {
            static final int COMMAND = 1;

            static Length process(VirtualMachineImpl vm, 
                                ArrayReferenceImpl arrayObject)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, arrayObject);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ArrayReferenceImpl arrayObject) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ArrayReference.Length"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arrayObject(ArrayReferenceImpl): " + (arrayObject==null?"NULL":"ref="+arrayObject.ref()));
                }
                ps.writeObjectRef(arrayObject.ref());
                ps.send();
                return ps;
            }

            static Length waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Length(vm, ps);
            }


            The length of the array.
/**
             * The length of the array.
             */
            final int arrayLength;

            private Length(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ArrayReference.Length"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                arrayLength = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "arrayLength(int): " + arrayLength);
                }
            }
        }

        Returns a range of array components. The specified range must 
be within the bounds of the array. 
/**
         * Returns a range of array components. The specified range must 
         * be within the bounds of the array. 
         */
        static class GetValues {
            static final int COMMAND = 2;

            static GetValues process(VirtualMachineImpl vm, 
                                ArrayReferenceImpl arrayObject, 
                                int firstIndex, 
                                int length)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, arrayObject, firstIndex, length);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ArrayReferenceImpl arrayObject, 
                                int firstIndex, 
                                int length) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ArrayReference.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arrayObject(ArrayReferenceImpl): " + (arrayObject==null?"NULL":"ref="+arrayObject.ref()));
                }
                ps.writeObjectRef(arrayObject.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 firstIndex(int): " + firstIndex);
                }
                ps.writeInt(firstIndex);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 length(int): " + length);
                }
                ps.writeInt(length);
                ps.send();
                return ps;
            }

            static GetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new GetValues(vm, ps);
            }


            The retrieved values. If the values 
are objects, they are tagged-values; 
otherwise, they are untagged-values
/**
             * The retrieved values. If the values 
             * are objects, they are tagged-values; 
             * otherwise, they are untagged-values
             */
            final List<?> values;

            private GetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ArrayReference.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                values = ps.readArrayRegion();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "values(List<?>): " + values);
                }
            }
        }

        Sets a range of array components. The specified range must 
be within the bounds of the array. 
For primitive values, each value's type must match the 
array component type exactly. For object values, there must be a 
widening reference conversion from the value's type to the
array component type and the array component type must be loaded. 
/**
         * Sets a range of array components. The specified range must 
         * be within the bounds of the array. 
         * For primitive values, each value's type must match the 
         * array component type exactly. For object values, there must be a 
         * widening reference conversion from the value's type to the
         * array component type and the array component type must be loaded. 
         */
        static class SetValues {
            static final int COMMAND = 3;

            static SetValues process(VirtualMachineImpl vm, 
                                ArrayReferenceImpl arrayObject, 
                                int firstIndex, 
                                ValueImpl[] values)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, arrayObject, firstIndex, values);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ArrayReferenceImpl arrayObject, 
                                int firstIndex, 
                                ValueImpl[] values) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ArrayReference.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 arrayObject(ArrayReferenceImpl): " + (arrayObject==null?"NULL":"ref="+arrayObject.ref()));
                }
                ps.writeObjectRef(arrayObject.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 firstIndex(int): " + firstIndex);
                }
                ps.writeInt(firstIndex);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 values(ValueImpl[]): " + "");
                }
                ps.writeInt(values.length);
                for (int i = 0; i < values.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     values[i](ValueImpl): " + values[i]);
                    }
                    ps.writeUntaggedValue(values[i]);
                }
                ps.send();
                return ps;
            }

            static SetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SetValues(vm, ps);
            }


            private SetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ArrayReference.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }
    }

    static class ClassLoaderReference {
        static final int COMMAND_SET = 14;
        private ClassLoaderReference() {}  // hide constructor

        Returns a list of all classes which this class loader can find 
by name via ClassLoader::loadClass, 
Class::forName and bytecode linkage. That is, 
all classes for which this class loader has been recorded as an 
initiating loader. The list contains each 
reference type created by this loader and any types for which 
loading was delegated by this class loader to another class loader. 

The visible class list has useful properties with respect to 
the type namespace. A particular type name will occur at most 
once in the list. Each field or variable declared with that 
type name in a class defined by 
this class loader must be resolved to that single type. 

No ordering of the returned list is guaranteed. 

See JVM TI GetClassLoaderClasses. 
/**
         * Returns a list of all classes which this class loader can find 
         * by name via <code>ClassLoader::loadClass</code>, 
         * <code>Class::forName</code> and bytecode linkage. That is, 
         * all classes for which this class loader has been recorded as an 
         * <i>initiating</i> loader. The list contains each 
         * reference type created by this loader and any types for which 
         * loading was delegated by this class loader to another class loader. 
         * <p>
         * The visible class list has useful properties with respect to 
         * the type namespace. A particular type name will occur at most 
         * once in the list. Each field or variable declared with that 
         * type name in a class defined by 
         * this class loader must be resolved to that single type. 
         * <p>
         * No ordering of the returned list is guaranteed. 
         * <p>
         * See <a href="../jvmti.html#GetClassLoaderClasses">JVM TI GetClassLoaderClasses</a>. 
         */
        static class VisibleClasses {
            static final int COMMAND = 1;

            static VisibleClasses process(VirtualMachineImpl vm, 
                                ClassLoaderReferenceImpl classLoaderObject)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, classLoaderObject);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassLoaderReferenceImpl classLoaderObject) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ClassLoaderReference.VisibleClasses"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 classLoaderObject(ClassLoaderReferenceImpl): " + (classLoaderObject==null?"NULL":"ref="+classLoaderObject.ref()));
                }
                ps.writeObjectRef(classLoaderObject.ref());
                ps.send();
                return ps;
            }

            static VisibleClasses waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new VisibleClasses(vm, ps);
            }

            static class ClassInfo {

                Kind 
of following reference type. 
/**
                 * <a href="#JDWP_TypeTag">Kind</a> 
                 * of following reference type. 
                 */
                final byte refTypeTag;

                A class visible to this class loader.
/**
                 * A class visible to this class loader.
                 */
                final long typeID;

                private ClassInfo(VirtualMachineImpl vm, PacketStream ps) {
                    refTypeTag = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "refTypeTag(byte): " + refTypeTag);
                    }
                    typeID = ps.readClassRef();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "typeID(long): " + "ref="+typeID);
                    }
                }
            }


            The number of visible classes. 
/**
             * The number of visible classes. 
             */
            final ClassInfo[] classes;

            private VisibleClasses(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ClassLoaderReference.VisibleClasses"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classes(ClassInfo[]): " + "");
                }
                int classesCount = ps.readInt();
                classes = new ClassInfo[classesCount];
                for (int i = 0; i < classesCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "classes[i](ClassInfo): " + "");
                    }
                    classes[i] = new ClassInfo(vm, ps);
                }
            }
        }
    }

    static class EventRequest {
        static final int COMMAND_SET = 15;
        private EventRequest() {}  // hide constructor

        Set an event request. When the event described by this request 
occurs, an event is sent from the 
target VM. If an event occurs that has not been requested then it is not sent 
from the target VM. The two exceptions to this are the VM Start Event and 
the VM Death Event which are automatically generated events - see 
Composite Command for further details.
/**
         * Set an event request. When the event described by this request 
         * occurs, an <a href="#JDWP_Event">event</a> is sent from the 
         * target VM. If an event occurs that has not been requested then it is not sent 
         * from the target VM. The two exceptions to this are the VM Start Event and 
         * the VM Death Event which are automatically generated events - see 
         * <a href="#JDWP_Event_Composite">Composite Command</a> for further details.
         */
        static class Set {
            static final int COMMAND = 1;

            static class Modifier {
                abstract static class ModifierCommon {
                    abstract void write(PacketStream ps);
                }

                Modifier kind
/**
                 * Modifier kind
                 */
                final byte modKind;
                ModifierCommon aModifierCommon;

                Modifier(byte modKind, ModifierCommon aModifierCommon) {
                    this.modKind = modKind;
                    this. aModifierCommon = aModifierCommon;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     modKind(byte): " + modKind);
                    }
                    ps.writeByte(modKind);
                     aModifierCommon.write(ps);
                }

                Limit the requested event to be reported at most once after a 
given number of occurrences.  The event is not reported 
the first count - 1 times this filter is reached. 
To request a one-off event, call this method with a count of 1. 

Once the count reaches 0, any subsequent filters in this request 
are applied. If none of those filters cause the event to be 
suppressed, the event is reported. Otherwise, the event is not 
reported. In either case subsequent events are never reported for 
this request. 
This modifier can be used with any event kind.
/**
                 * Limit the requested event to be reported at most once after a 
                 * given number of occurrences.  The event is not reported 
                 * the first <code>count - 1</code> times this filter is reached. 
                 * To request a one-off event, call this method with a count of 1. 
                 * <p>
                 * Once the count reaches 0, any subsequent filters in this request 
                 * are applied. If none of those filters cause the event to be 
                 * suppressed, the event is reported. Otherwise, the event is not 
                 * reported. In either case subsequent events are never reported for 
                 * this request. 
                 * This modifier can be used with any event kind.
                 */
                static class Count extends ModifierCommon {
                    static final byte ALT_ID = 1;
                    static Modifier create(int count) {
                        return new Modifier(ALT_ID, new Count(count));
                    }

                    Count before event. One for one-off.
/**
                     * Count before event. One for one-off.
                     */
                    final int count;

                    Count(int count) {
                        this.count = count;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         count(int): " + count);
                        }
                        ps.writeInt(count);
                    }
                }

                Conditional on expression
/**
                 * Conditional on expression
                 */
                static class Conditional extends ModifierCommon {
                    static final byte ALT_ID = 2;
                    static Modifier create(int exprID) {
                        return new Modifier(ALT_ID, new Conditional(exprID));
                    }

                    For the future
/**
                     * For the future
                     */
                    final int exprID;

                    Conditional(int exprID) {
                        this.exprID = exprID;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         exprID(int): " + exprID);
                        }
                        ps.writeInt(exprID);
                    }
                }

                Restricts reported events to 
those in the given thread. 
This modifier can be used with any event kind 
except for class unload. 
/**
                 * Restricts reported events to 
                 * those in the given thread. 
                 * This modifier can be used with any event kind 
                 * except for class unload. 
                 */
                static class ThreadOnly extends ModifierCommon {
                    static final byte ALT_ID = 3;
                    static Modifier create(ThreadReferenceImpl thread) {
                        return new Modifier(ALT_ID, new ThreadOnly(thread));
                    }

                    Required thread
/**
                     * Required thread
                     */
                    final ThreadReferenceImpl thread;

                    ThreadOnly(ThreadReferenceImpl thread) {
                        this.thread = thread;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        ps.writeObjectRef(thread.ref());
                    }
                }

                For class prepare events, restricts the events 
generated by this request to be the 
preparation of the given reference type and any subtypes. 
For monitor wait and waited events, restricts the events 
generated by this request to those whose monitor object 
is of the given reference type or any of its subtypes. 
For other events, restricts the events generated 
by this request to those 
whose location is in the given reference type or any of its subtypes. 
An event will be generated for any location in a reference type that can 
be safely cast to the given reference type. 
This modifier can be used with any event kind except 
class unload, thread start, and thread end. 
/**
                 * For class prepare events, restricts the events 
                 * generated by this request to be the 
                 * preparation of the given reference type and any subtypes. 
                 * For monitor wait and waited events, restricts the events 
                 * generated by this request to those whose monitor object 
                 * is of the given reference type or any of its subtypes. 
                 * For other events, restricts the events generated 
                 * by this request to those 
                 * whose location is in the given reference type or any of its subtypes. 
                 * An event will be generated for any location in a reference type that can 
                 * be safely cast to the given reference type. 
                 * This modifier can be used with any event kind except 
                 * class unload, thread start, and thread end. 
                 */
                static class ClassOnly extends ModifierCommon {
                    static final byte ALT_ID = 4;
                    static Modifier create(ReferenceTypeImpl clazz) {
                        return new Modifier(ALT_ID, new ClassOnly(clazz));
                    }

                    Required class
/**
                     * Required class
                     */
                    final ReferenceTypeImpl clazz;

                    ClassOnly(ReferenceTypeImpl clazz) {
                        this.clazz = clazz;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         clazz(ReferenceTypeImpl): " + (clazz==null?"NULL":"ref="+clazz.ref()));
                        }
                        ps.writeClassRef(clazz.ref());
                    }
                }

                Restricts reported events to those for classes whose name 
matches the given restricted regular expression. 
For class prepare events, the prepared class name 
is matched. For class unload events, the 
unloaded class name is matched. For monitor wait 
and waited events, the name of the class of the 
monitor object is matched. For other events, 
the class name of the event's location is matched. 
This modifier can be used with any event kind except 
thread start and thread end. 
/**
                 * Restricts reported events to those for classes whose name 
                 * matches the given restricted regular expression. 
                 * For class prepare events, the prepared class name 
                 * is matched. For class unload events, the 
                 * unloaded class name is matched. For monitor wait 
                 * and waited events, the name of the class of the 
                 * monitor object is matched. For other events, 
                 * the class name of the event's location is matched. 
                 * This modifier can be used with any event kind except 
                 * thread start and thread end. 
                 */
                static class ClassMatch extends ModifierCommon {
                    static final byte ALT_ID = 5;
                    static Modifier create(String classPattern) {
                        return new Modifier(ALT_ID, new ClassMatch(classPattern));
                    }

                    Required class pattern. 
Matches are limited to exact matches of the 
given class pattern and matches of patterns that 
begin or end with '*'; for example, 
"*.Foo" or "java.*". 
/**
                     * Required class pattern. 
                     * Matches are limited to exact matches of the 
                     * given class pattern and matches of patterns that 
                     * begin or end with '*'; for example, 
                     * "*.Foo" or "java.*". 
                     */
                    final String classPattern;

                    ClassMatch(String classPattern) {
                        this.classPattern = classPattern;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         classPattern(String): " + classPattern);
                        }
                        ps.writeString(classPattern);
                    }
                }

                Restricts reported events to those for classes whose name 
does not match the given restricted regular expression. 
For class prepare events, the prepared class name 
is matched. For class unload events, the 
unloaded class name is matched. For monitor wait and 
waited events, the name of the class of the monitor 
object is matched. For other events, 
the class name of the event's location is matched. 
This modifier can be used with any event kind except 
thread start and thread end. 
/**
                 * Restricts reported events to those for classes whose name 
                 * does not match the given restricted regular expression. 
                 * For class prepare events, the prepared class name 
                 * is matched. For class unload events, the 
                 * unloaded class name is matched. For monitor wait and 
                 * waited events, the name of the class of the monitor 
                 * object is matched. For other events, 
                 * the class name of the event's location is matched. 
                 * This modifier can be used with any event kind except 
                 * thread start and thread end. 
                 */
                static class ClassExclude extends ModifierCommon {
                    static final byte ALT_ID = 6;
                    static Modifier create(String classPattern) {
                        return new Modifier(ALT_ID, new ClassExclude(classPattern));
                    }

                    Disallowed class pattern. 
Matches are limited to exact matches of the 
given class pattern and matches of patterns that 
begin or end with '*'; for example, 
"*.Foo" or "java.*". 
/**
                     * Disallowed class pattern. 
                     * Matches are limited to exact matches of the 
                     * given class pattern and matches of patterns that 
                     * begin or end with '*'; for example, 
                     * "*.Foo" or "java.*". 
                     */
                    final String classPattern;

                    ClassExclude(String classPattern) {
                        this.classPattern = classPattern;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         classPattern(String): " + classPattern);
                        }
                        ps.writeString(classPattern);
                    }
                }

                Restricts reported events to those that occur at 
the given location. 
This modifier can be used with 
breakpoint, field access, field modification, 
step, and exception event kinds. 
/**
                 * Restricts reported events to those that occur at 
                 * the given location. 
                 * This modifier can be used with 
                 * breakpoint, field access, field modification, 
                 * step, and exception event kinds. 
                 */
                static class LocationOnly extends ModifierCommon {
                    static final byte ALT_ID = 7;
                    static Modifier create(Location loc) {
                        return new Modifier(ALT_ID, new LocationOnly(loc));
                    }

                    Required location
/**
                     * Required location
                     */
                    final Location loc;

                    LocationOnly(Location loc) {
                        this.loc = loc;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         loc(Location): " + loc);
                        }
                        ps.writeLocation(loc);
                    }
                }

                Restricts reported exceptions by their class and 
whether they are caught or uncaught. 
This modifier can be used with 
exception event kinds only. 
/**
                 * Restricts reported exceptions by their class and 
                 * whether they are caught or uncaught. 
                 * This modifier can be used with 
                 * exception event kinds only. 
                 */
                static class ExceptionOnly extends ModifierCommon {
                    static final byte ALT_ID = 8;
                    static Modifier create(ReferenceTypeImpl exceptionOrNull, boolean caught, boolean uncaught) {
                        return new Modifier(ALT_ID, new ExceptionOnly(exceptionOrNull, caught, uncaught));
                    }

                    Exception to report. Null (0) means report 
exceptions of all types. 
A non-null type restricts the reported exception 
events to exceptions of the given type or 
any of its subtypes. 
/**
                     * Exception to report. Null (0) means report 
                     * exceptions of all types. 
                     * A non-null type restricts the reported exception 
                     * events to exceptions of the given type or 
                     * any of its subtypes. 
                     */
                    final ReferenceTypeImpl exceptionOrNull;

                    Report caught exceptions
/**
                     * Report caught exceptions
                     */
                    final boolean caught;

                    Report uncaught exceptions. 
Note that it 
is not always possible to determine whether an 
exception is caught or uncaught at the time it is 
thrown. See the exception event catch location under 
composite events 
for more information. 
/**
                     * Report uncaught exceptions. 
                     * Note that it 
                     * is not always possible to determine whether an 
                     * exception is caught or uncaught at the time it is 
                     * thrown. See the exception event catch location under 
                     * <a href="#JDWP_Event_Composite">composite events</a> 
                     * for more information. 
                     */
                    final boolean uncaught;

                    ExceptionOnly(ReferenceTypeImpl exceptionOrNull, boolean caught, boolean uncaught) {
                        this.exceptionOrNull = exceptionOrNull;
                        this.caught = caught;
                        this.uncaught = uncaught;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         exceptionOrNull(ReferenceTypeImpl): " + (exceptionOrNull==null?"NULL":"ref="+exceptionOrNull.ref()));
                        }
                        ps.writeClassRef(exceptionOrNull.ref());
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         caught(boolean): " + caught);
                        }
                        ps.writeBoolean(caught);
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         uncaught(boolean): " + uncaught);
                        }
                        ps.writeBoolean(uncaught);
                    }
                }

                Restricts reported events to those that occur for 
a given field. 
This modifier can be used with 
field access and field modification event kinds only. 
/**
                 * Restricts reported events to those that occur for 
                 * a given field. 
                 * This modifier can be used with 
                 * field access and field modification event kinds only. 
                 */
                static class FieldOnly extends ModifierCommon {
                    static final byte ALT_ID = 9;
                    static Modifier create(ReferenceTypeImpl declaring, long fieldID) {
                        return new Modifier(ALT_ID, new FieldOnly(declaring, fieldID));
                    }

                    Type in which field is declared.
/**
                     * Type in which field is declared.
                     */
                    final ReferenceTypeImpl declaring;

                    Required field
/**
                     * Required field
                     */
                    final long fieldID;

                    FieldOnly(ReferenceTypeImpl declaring, long fieldID) {
                        this.declaring = declaring;
                        this.fieldID = fieldID;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         declaring(ReferenceTypeImpl): " + (declaring==null?"NULL":"ref="+declaring.ref()));
                        }
                        ps.writeClassRef(declaring.ref());
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         fieldID(long): " + fieldID);
                        }
                        ps.writeFieldRef(fieldID);
                    }
                }

                Restricts reported step events 
to those which satisfy 
depth and size constraints. 
This modifier can be used with 
step event kinds only. 
/**
                 * Restricts reported step events 
                 * to those which satisfy 
                 * depth and size constraints. 
                 * This modifier can be used with 
                 * step event kinds only. 
                 */
                static class Step extends ModifierCommon {
                    static final byte ALT_ID = 10;
                    static Modifier create(ThreadReferenceImpl thread, int size, int depth) {
                        return new Modifier(ALT_ID, new Step(thread, size, depth));
                    }

                    Thread in which to step
/**
                     * Thread in which to step
                     */
                    final ThreadReferenceImpl thread;

                    size of each step. 
See JDWP.StepSize
/**
                     * size of each step. 
                     * See <a href="#JDWP_StepSize">JDWP.StepSize</a>
                     */
                    final int size;

                    relative call stack limit. 
See JDWP.StepDepth
/**
                     * relative call stack limit. 
                     * See <a href="#JDWP_StepDepth">JDWP.StepDepth</a>
                     */
                    final int depth;

                    Step(ThreadReferenceImpl thread, int size, int depth) {
                        this.thread = thread;
                        this.size = size;
                        this.depth = depth;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        ps.writeObjectRef(thread.ref());
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         size(int): " + size);
                        }
                        ps.writeInt(size);
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         depth(int): " + depth);
                        }
                        ps.writeInt(depth);
                    }
                }

                Restricts reported events to those whose 
active 'this' object is the given object. 
Match value is the null object for static methods. 
This modifier can be used with any event kind 
except class prepare, class unload, thread start, 
and thread end. Introduced in JDWP version 1.4.
/**
                 * Restricts reported events to those whose 
                 * active 'this' object is the given object. 
                 * Match value is the null object for static methods. 
                 * This modifier can be used with any event kind 
                 * except class prepare, class unload, thread start, 
                 * and thread end. Introduced in JDWP version 1.4.
                 */
                static class InstanceOnly extends ModifierCommon {
                    static final byte ALT_ID = 11;
                    static Modifier create(ObjectReferenceImpl instance) {
                        return new Modifier(ALT_ID, new InstanceOnly(instance));
                    }

                    Required 'this' object
/**
                     * Required 'this' object
                     */
                    final ObjectReferenceImpl instance;

                    InstanceOnly(ObjectReferenceImpl instance) {
                        this.instance = instance;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         instance(ObjectReferenceImpl): " + (instance==null?"NULL":"ref="+instance.ref()));
                        }
                        ps.writeObjectRef(instance.ref());
                    }
                }

                Restricts reported class prepare events to those 
for reference types which have a source name 
which matches the given restricted regular expression. 
The source names are determined by the reference type's 
 
SourceDebugExtension. 
This modifier can only be used with class prepare 
events. 
Since JDWP version 1.6. Requires the canUseSourceNameFilters 
capability - see 
CapabilitiesNew.
/**
                 * Restricts reported class prepare events to those 
                 * for reference types which have a source name 
                 * which matches the given restricted regular expression. 
                 * The source names are determined by the reference type's 
                 * <a href="#JDWP_ReferenceType_SourceDebugExtension"> 
                 * SourceDebugExtension</a>. 
                 * This modifier can only be used with class prepare 
                 * events. 
                 * Since JDWP version 1.6. Requires the canUseSourceNameFilters 
                 * capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
                 */
                static class SourceNameMatch extends ModifierCommon {
                    static final byte ALT_ID = 12;
                    static Modifier create(String sourceNamePattern) {
                        return new Modifier(ALT_ID, new SourceNameMatch(sourceNamePattern));
                    }

                    Required source name pattern. 
Matches are limited to exact matches of the 
given pattern and matches of patterns that 
begin or end with '*'; for example, 
"*.Foo" or "java.*". 
/**
                     * Required source name pattern. 
                     * Matches are limited to exact matches of the 
                     * given pattern and matches of patterns that 
                     * begin or end with '*'; for example, 
                     * "*.Foo" or "java.*". 
                     */
                    final String sourceNamePattern;

                    SourceNameMatch(String sourceNamePattern) {
                        this.sourceNamePattern = sourceNamePattern;
                    }

                    void write(PacketStream ps) {
                        if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                            ps.vm.printTrace("Sending:                         sourceNamePattern(String): " + sourceNamePattern);
                        }
                        ps.writeString(sourceNamePattern);
                    }
                }
            }

            static Set process(VirtualMachineImpl vm, 
                                byte eventKind, 
                                byte suspendPolicy, 
                                Modifier[] modifiers)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, eventKind, suspendPolicy, modifiers);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                byte eventKind, 
                                byte suspendPolicy, 
                                Modifier[] modifiers) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.EventRequest.Set"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 eventKind(byte): " + eventKind);
                }
                ps.writeByte(eventKind);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 suspendPolicy(byte): " + suspendPolicy);
                }
                ps.writeByte(suspendPolicy);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 modifiers(Modifier[]): " + "");
                }
                ps.writeInt(modifiers.length);
                for (int i = 0; i < modifiers.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     modifiers[i](Modifier): " + "");
                    }
                    modifiers[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static Set waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Set(vm, ps);
            }


            ID of created request
/**
             * ID of created request
             */
            final int requestID;

            private Set(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.EventRequest.Set"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                requestID = ps.readInt();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "requestID(int): " + requestID);
                }
            }
        }

        Clear an event request. See JDWP.EventKind 
for a complete list of events that can be cleared. Only the event request matching 
the specified event kind and requestID is cleared. If there isn't a matching event 
request the command is a no-op and does not result in an error. Automatically 
generated events do not have a corresponding event request and may not be cleared 
using this command.
/**
         * Clear an event request. See <a href="#JDWP_EventKind">JDWP.EventKind</a> 
         * for a complete list of events that can be cleared. Only the event request matching 
         * the specified event kind and requestID is cleared. If there isn't a matching event 
         * request the command is a no-op and does not result in an error. Automatically 
         * generated events do not have a corresponding event request and may not be cleared 
         * using this command.
         */
        static class Clear {
            static final int COMMAND = 2;

            static Clear process(VirtualMachineImpl vm, 
                                byte eventKind, 
                                int requestID)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, eventKind, requestID);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                byte eventKind, 
                                int requestID) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.EventRequest.Clear"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 eventKind(byte): " + eventKind);
                }
                ps.writeByte(eventKind);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 requestID(int): " + requestID);
                }
                ps.writeInt(requestID);
                ps.send();
                return ps;
            }

            static Clear waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Clear(vm, ps);
            }


            private Clear(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.EventRequest.Clear"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Removes all set breakpoints, a no-op if there are no breakpoints set.
/**
         * Removes all set breakpoints, a no-op if there are no breakpoints set.
         */
        static class ClearAllBreakpoints {
            static final int COMMAND = 3;

            static ClearAllBreakpoints process(VirtualMachineImpl vm)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.EventRequest.ClearAllBreakpoints"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                ps.send();
                return ps;
            }

            static ClearAllBreakpoints waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClearAllBreakpoints(vm, ps);
            }


            private ClearAllBreakpoints(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.EventRequest.ClearAllBreakpoints"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }
    }

    static class StackFrame {
        static final int COMMAND_SET = 16;
        private StackFrame() {}  // hide constructor

        Returns the value of one or more local variables in a 
given frame. Each variable must be visible at the frame's code index. 
Even if local variable information is not available, values can 
be retrieved if the front-end is able to 
determine the correct local variable index. (Typically, this 
index can be determined for method arguments from the method 
signature without access to the local variable table information.) 
/**
         * Returns the value of one or more local variables in a 
         * given frame. Each variable must be visible at the frame's code index. 
         * Even if local variable information is not available, values can 
         * be retrieved if the front-end is able to 
         * determine the correct local variable index. (Typically, this 
         * index can be determined for method arguments from the method 
         * signature without access to the local variable table information.) 
         */
        static class GetValues {
            static final int COMMAND = 1;

            static class SlotInfo {

                The local variable's index in the frame. 
/**
                 * The local variable's index in the frame. 
                 */
                final int slot;

                A tag 
identifying the type of the variable 
/**
                 * A <a href="#JDWP_Tag">tag</a> 
                 * identifying the type of the variable 
                 */
                final byte sigbyte;

                SlotInfo(int slot, byte sigbyte) {
                    this.slot = slot;
                    this.sigbyte = sigbyte;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     slot(int): " + slot);
                    }
                    ps.writeInt(slot);
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     sigbyte(byte): " + sigbyte);
                    }
                    ps.writeByte(sigbyte);
                }
            }

            static GetValues process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame, 
                                SlotInfo[] slots)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, frame, slots);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame, 
                                SlotInfo[] slots) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.StackFrame.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 frame(long): " + frame);
                }
                ps.writeFrameRef(frame);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 slots(SlotInfo[]): " + "");
                }
                ps.writeInt(slots.length);
                for (int i = 0; i < slots.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     slots[i](SlotInfo): " + "");
                    }
                    slots[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static GetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new GetValues(vm, ps);
            }


            The number of values retrieved, always equal to slots, 
the number of values to get.
/**
             * The number of values retrieved, always equal to slots, 
             * the number of values to get.
             */
            final ValueImpl[] values;

            private GetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.StackFrame.GetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "values(ValueImpl[]): " + "");
                }
                int valuesCount = ps.readInt();
                values = new ValueImpl[valuesCount];
                for (int i = 0; i < valuesCount; i++) {;
                    values[i] = ps.readValue();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "values[i](ValueImpl): " + values[i]);
                    }
                }
            }
        }

        Sets the value of one or more local variables. 
Each variable must be visible at the current frame code index. 
For primitive values, the value's type must match the 
variable's type exactly. For object values, there must be a 
widening reference conversion from the value's type to the
variable's type and the variable's type must be loaded. 

Even if local variable information is not available, values can 
be set, if the front-end is able to 
determine the correct local variable index. (Typically, this
index can be determined for method arguments from the method 
signature without access to the local variable table information.) 
/**
         * Sets the value of one or more local variables. 
         * Each variable must be visible at the current frame code index. 
         * For primitive values, the value's type must match the 
         * variable's type exactly. For object values, there must be a 
         * widening reference conversion from the value's type to the
         * variable's type and the variable's type must be loaded. 
         * <p>
         * Even if local variable information is not available, values can 
         * be set, if the front-end is able to 
         * determine the correct local variable index. (Typically, this
         * index can be determined for method arguments from the method 
         * signature without access to the local variable table information.) 
         */
        static class SetValues {
            static final int COMMAND = 2;

            static class SlotInfo {

                The slot ID. 
/**
                 * The slot ID. 
                 */
                final int slot;

                The value to set. 
/**
                 * The value to set. 
                 */
                final ValueImpl slotValue;

                SlotInfo(int slot, ValueImpl slotValue) {
                    this.slot = slot;
                    this.slotValue = slotValue;
                }

                private void write(PacketStream ps) {
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     slot(int): " + slot);
                    }
                    ps.writeInt(slot);
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     slotValue(ValueImpl): " + slotValue);
                    }
                    ps.writeValue(slotValue);
                }
            }

            static SetValues process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame, 
                                SlotInfo[] slotValues)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, frame, slotValues);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame, 
                                SlotInfo[] slotValues) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.StackFrame.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 frame(long): " + frame);
                }
                ps.writeFrameRef(frame);
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 slotValues(SlotInfo[]): " + "");
                }
                ps.writeInt(slotValues.length);
                for (int i = 0; i < slotValues.length; i++) {;
                    if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                        ps.vm.printTrace("Sending:                     slotValues[i](SlotInfo): " + "");
                    }
                    slotValues[i].write(ps);
                }
                ps.send();
                return ps;
            }

            static SetValues waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new SetValues(vm, ps);
            }


            private SetValues(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.StackFrame.SetValues"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }

        Returns the value of the 'this' reference for this frame. 
If the frame's method is static or native, the reply 
will contain the null object reference. 
/**
         * Returns the value of the 'this' reference for this frame. 
         * If the frame's method is static or native, the reply 
         * will contain the null object reference. 
         */
        static class ThisObject {
            static final int COMMAND = 3;

            static ThisObject process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, frame);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.StackFrame.ThisObject"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 frame(long): " + frame);
                }
                ps.writeFrameRef(frame);
                ps.send();
                return ps;
            }

            static ThisObject waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ThisObject(vm, ps);
            }


            The 'this' object for this frame. 
/**
             * The 'this' object for this frame. 
             */
            final ObjectReferenceImpl objectThis;

            private ThisObject(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.StackFrame.ThisObject"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                objectThis = ps.readTaggedObjectReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "objectThis(ObjectReferenceImpl): " + (objectThis==null?"NULL":"ref="+objectThis.ref()));
                }
            }
        }

        Pop the top-most stack frames of the thread stack, up to, and including 'frame'. 
The thread must be suspended to perform this command. 
The top-most stack frames are discarded and the stack frame previous to 'frame' 
becomes the current frame. The operand stack is restored -- the argument values 
are added back and if the invoke was not invokestatic, 
objectref is added back as well. The Java virtual machine 
program counter is restored to the opcode of the invoke instruction.

Since JDWP version 1.4. Requires canPopFrames capability - see 
CapabilitiesNew.
/**
         * Pop the top-most stack frames of the thread stack, up to, and including 'frame'. 
         * The thread must be suspended to perform this command. 
         * The top-most stack frames are discarded and the stack frame previous to 'frame' 
         * becomes the current frame. The operand stack is restored -- the argument values 
         * are added back and if the invoke was not <code>invokestatic</code>, 
         * <code>objectref</code> is added back as well. The Java virtual machine 
         * program counter is restored to the opcode of the invoke instruction.
         * <p>
         * Since JDWP version 1.4. Requires canPopFrames capability - see 
         * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
         */
        static class PopFrames {
            static final int COMMAND = 4;

            static PopFrames process(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, thread, frame);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ThreadReferenceImpl thread, 
                                long frame) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.StackFrame.PopFrames"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                }
                ps.writeObjectRef(thread.ref());
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 frame(long): " + frame);
                }
                ps.writeFrameRef(frame);
                ps.send();
                return ps;
            }

            static PopFrames waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new PopFrames(vm, ps);
            }


            private PopFrames(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.StackFrame.PopFrames"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
            }
        }
    }

    static class ClassObjectReference {
        static final int COMMAND_SET = 17;
        private ClassObjectReference() {}  // hide constructor

        Returns the reference type reflected by this class object.
/**
         * Returns the reference type reflected by this class object.
         */
        static class ReflectedType {
            static final int COMMAND = 1;

            static ReflectedType process(VirtualMachineImpl vm, 
                                ClassObjectReferenceImpl classObject)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, classObject);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ClassObjectReferenceImpl classObject) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ClassObjectReference.ReflectedType"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 classObject(ClassObjectReferenceImpl): " + (classObject==null?"NULL":"ref="+classObject.ref()));
                }
                ps.writeObjectRef(classObject.ref());
                ps.send();
                return ps;
            }

            static ReflectedType waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ReflectedType(vm, ps);
            }


            Kind 
of following reference type. 
/**
             * <a href="#JDWP_TypeTag">Kind</a> 
             * of following reference type. 
             */
            final byte refTypeTag;

            reflected reference type
/**
             * reflected reference type
             */
            final long typeID;

            private ReflectedType(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ClassObjectReference.ReflectedType"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                refTypeTag = ps.readByte();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "refTypeTag(byte): " + refTypeTag);
                }
                typeID = ps.readClassRef();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "typeID(long): " + "ref="+typeID);
                }
            }
        }
    }

    static class ModuleReference {
        static final int COMMAND_SET = 18;
        private ModuleReference() {}  // hide constructor

        Returns the name of this module.
Since JDWP version 9.
/**
         * Returns the name of this module.
         * <p>Since JDWP version 9.
         */
        static class Name {
            static final int COMMAND = 1;

            static Name process(VirtualMachineImpl vm, 
                                ModuleReferenceImpl module)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, module);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ModuleReferenceImpl module) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ModuleReference.Name"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 module(ModuleReferenceImpl): " + (module==null?"NULL":"ref="+module.ref()));
                }
                ps.writeModuleRef(module.ref());
                ps.send();
                return ps;
            }

            static Name waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new Name(vm, ps);
            }


            The module's name.
/**
             * The module's name.
             */
            final String name;

            private Name(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ModuleReference.Name"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                name = ps.readString();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "name(String): " + name);
                }
            }
        }

        Returns the class loader of this module.
Since JDWP version 9.
/**
         * Returns the class loader of this module.
         * <p>Since JDWP version 9.
         */
        static class ClassLoader {
            static final int COMMAND = 2;

            static ClassLoader process(VirtualMachineImpl vm, 
                                ModuleReferenceImpl module)
                                    throws JDWPException {
                PacketStream ps = enqueueCommand(vm, module);
                return waitForReply(vm, ps);
            }

            static PacketStream enqueueCommand(VirtualMachineImpl vm, 
                                ModuleReferenceImpl module) {
                PacketStream ps = new PacketStream(vm, COMMAND_SET, COMMAND);
                if ((vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    vm.printTrace("Sending Command(id=" + ps.pkt.id + ") JDWP.ModuleReference.ClassLoader"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:""));
                }
                if ((ps.vm.traceFlags & VirtualMachineImpl.TRACE_SENDS) != 0) {
                    ps.vm.printTrace("Sending:                 module(ModuleReferenceImpl): " + (module==null?"NULL":"ref="+module.ref()));
                }
                ps.writeModuleRef(module.ref());
                ps.send();
                return ps;
            }

            static ClassLoader waitForReply(VirtualMachineImpl vm, PacketStream ps)
                                    throws JDWPException {
                ps.waitForReply();
                return new ClassLoader(vm, ps);
            }


            The module's class loader.
/**
             * The module's class loader.
             */
            final ClassLoaderReferenceImpl classLoader;

            private ClassLoader(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.ModuleReference.ClassLoader"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                classLoader = ps.readClassLoaderReference();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "classLoader(ClassLoaderReferenceImpl): " + (classLoader==null?"NULL":"ref="+classLoader.ref()));
                }
            }
        }
    }

    static class Event {
        static final int COMMAND_SET = 64;
        private Event() {}  // hide constructor

        Several events may occur at a given time in the target VM. 
For example, there may be more than one breakpoint request 
for a given location 
or you might single step to the same location as a 
breakpoint request.  These events are delivered 
together as a composite event.  For uniformity, a 
composite event is always used 
to deliver events, even if there is only one event to report. 

The events that are grouped in a composite event are restricted in the 
following ways: 

Only with other thread start events for the same thread:
    
    Thread Start Event
    
Only with other thread death events for the same thread:
    
    Thread Death Event
    
Only with other class prepare events for the same class:
    
    Class Prepare Event
    
Only with other class unload events for the same class:
    
    Class Unload Event
    
Only with other access watchpoint events for the same field access:
    
    Access Watchpoint Event
    
Only with other modification watchpoint events for the same field 
modification:
    
    Modification Watchpoint Event
    
Only with other Monitor contended enter events for the same monitor object: 
    
    Monitor Contended Enter Event
    
Only with other Monitor contended entered events for the same monitor object: 
    
    Monitor Contended Entered Event
    
Only with other Monitor wait events for the same monitor object: 
    
    Monitor Wait Event
    
Only with other Monitor waited events for the same monitor object: 
    
    Monitor Waited Event
    
Only with other ExceptionEvents for the same exception occurrance:
    
    ExceptionEvent
    
Only with other members of this group, at the same location 
and in the same thread: 
    
    Breakpoint Event
    
Step Event
    
Method Entry Event
    
Method Exit Event
    


The VM Start Event and VM Death Event are automatically generated events. 
This means they do not need to be requested using the 
EventRequest.Set command. 
The VM Start event signals the completion of VM initialization. The VM Death 
event signals the termination of the VM.
If there is a debugger connected at the time when an automatically generated 
event occurs it is sent from the target VM. Automatically generated events may 
also be requested using the EventRequest.Set command and thus multiple events 
of the same event kind will be sent from the target VM when an event occurs.
Automatically generated events are sent with the requestID field 
in the Event Data set to 0. The value of the suspendPolicy field in the 
Event Data depends on the event. For the automatically generated VM Start 
Event the value of suspendPolicy is not defined and is therefore implementation 
or configuration specific. In the Sun implementation, for example, the 
suspendPolicy is specified as an option to the JDWP agent at launch-time.
The automatically generated VM Death Event will have the suspendPolicy set to 
NONE.
/**
         * Several events may occur at a given time in the target VM. 
         * For example, there may be more than one breakpoint request 
         * for a given location 
         * or you might single step to the same location as a 
         * breakpoint request.  These events are delivered 
         * together as a composite event.  For uniformity, a 
         * composite event is always used 
         * to deliver events, even if there is only one event to report. 
         * <P>
         * The events that are grouped in a composite event are restricted in the 
         * following ways: 
         * <UL>
         * <LI>Only with other thread start events for the same thread:
         *     <UL>
         *     <LI>Thread Start Event
         *     </UL>
         * <LI>Only with other thread death events for the same thread:
         *     <UL>
         *     <LI>Thread Death Event
         *     </UL>
         * <LI>Only with other class prepare events for the same class:
         *     <UL>
         *     <LI>Class Prepare Event
         *     </UL>
         * <LI>Only with other class unload events for the same class:
         *     <UL>
         *     <LI>Class Unload Event
         *     </UL>
         * <LI>Only with other access watchpoint events for the same field access:
         *     <UL>
         *     <LI>Access Watchpoint Event
         *     </UL>
         * <LI>Only with other modification watchpoint events for the same field 
         * modification:
         *     <UL>
         *     <LI>Modification Watchpoint Event
         *     </UL>
         * <LI>Only with other Monitor contended enter events for the same monitor object: 
         *     <UL>
         *     <LI>Monitor Contended Enter Event
         *     </UL>
         * <LI>Only with other Monitor contended entered events for the same monitor object: 
         *     <UL>
         *     <LI>Monitor Contended Entered Event
         *     </UL>
         * <LI>Only with other Monitor wait events for the same monitor object: 
         *     <UL>
         *     <LI>Monitor Wait Event
         *     </UL>
         * <LI>Only with other Monitor waited events for the same monitor object: 
         *     <UL>
         *     <LI>Monitor Waited Event
         *     </UL>
         * <LI>Only with other ExceptionEvents for the same exception occurrance:
         *     <UL>
         *     <LI>ExceptionEvent
         *     </UL>
         * <LI>Only with other members of this group, at the same location 
         * and in the same thread: 
         *     <UL>
         *     <LI>Breakpoint Event
         *     <LI>Step Event
         *     <LI>Method Entry Event
         *     <LI>Method Exit Event
         *     </UL>
         * </UL>
         * <P>
         * The VM Start Event and VM Death Event are automatically generated events. 
         * This means they do not need to be requested using the 
         * <a href="#JDWP_EventRequest_Set">EventRequest.Set</a> command. 
         * The VM Start event signals the completion of VM initialization. The VM Death 
         * event signals the termination of the VM.
         * If there is a debugger connected at the time when an automatically generated 
         * event occurs it is sent from the target VM. Automatically generated events may 
         * also be requested using the EventRequest.Set command and thus multiple events 
         * of the same event kind will be sent from the target VM when an event occurs.
         * Automatically generated events are sent with the requestID field 
         * in the Event Data set to 0. The value of the suspendPolicy field in the 
         * Event Data depends on the event. For the automatically generated VM Start 
         * Event the value of suspendPolicy is not defined and is therefore implementation 
         * or configuration specific. In the Sun implementation, for example, the 
         * suspendPolicy is specified as an option to the JDWP agent at launch-time.
         * The automatically generated VM Death Event will have the suspendPolicy set to 
         * NONE.
         */
        static class Composite {
            static final int COMMAND = 100;

            static class Events {
                abstract static class EventsCommon {
                    abstract byte eventKind();
                }

                Event kind selector
/**
                 * Event kind selector
                 */
                final byte eventKind;
                EventsCommon aEventsCommon;

                Events(VirtualMachineImpl vm, PacketStream ps) {
                    eventKind = ps.readByte();
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "eventKind(byte): " + eventKind);
                    }
                    switch (eventKind) {
                        case JDWP.EventKind.VM_START:
                             aEventsCommon = new VMStart(vm, ps);
                            break;
                        case JDWP.EventKind.SINGLE_STEP:
                             aEventsCommon = new SingleStep(vm, ps);
                            break;
                        case JDWP.EventKind.BREAKPOINT:
                             aEventsCommon = new Breakpoint(vm, ps);
                            break;
                        case JDWP.EventKind.METHOD_ENTRY:
                             aEventsCommon = new MethodEntry(vm, ps);
                            break;
                        case JDWP.EventKind.METHOD_EXIT:
                             aEventsCommon = new MethodExit(vm, ps);
                            break;
                        case JDWP.EventKind.METHOD_EXIT_WITH_RETURN_VALUE:
                             aEventsCommon = new MethodExitWithReturnValue(vm, ps);
                            break;
                        case JDWP.EventKind.MONITOR_CONTENDED_ENTER:
                             aEventsCommon = new MonitorContendedEnter(vm, ps);
                            break;
                        case JDWP.EventKind.MONITOR_CONTENDED_ENTERED:
                             aEventsCommon = new MonitorContendedEntered(vm, ps);
                            break;
                        case JDWP.EventKind.MONITOR_WAIT:
                             aEventsCommon = new MonitorWait(vm, ps);
                            break;
                        case JDWP.EventKind.MONITOR_WAITED:
                             aEventsCommon = new MonitorWaited(vm, ps);
                            break;
                        case JDWP.EventKind.EXCEPTION:
                             aEventsCommon = new Exception(vm, ps);
                            break;
                        case JDWP.EventKind.THREAD_START:
                             aEventsCommon = new ThreadStart(vm, ps);
                            break;
                        case JDWP.EventKind.THREAD_DEATH:
                             aEventsCommon = new ThreadDeath(vm, ps);
                            break;
                        case JDWP.EventKind.CLASS_PREPARE:
                             aEventsCommon = new ClassPrepare(vm, ps);
                            break;
                        case JDWP.EventKind.CLASS_UNLOAD:
                             aEventsCommon = new ClassUnload(vm, ps);
                            break;
                        case JDWP.EventKind.FIELD_ACCESS:
                             aEventsCommon = new FieldAccess(vm, ps);
                            break;
                        case JDWP.EventKind.FIELD_MODIFICATION:
                             aEventsCommon = new FieldModification(vm, ps);
                            break;
                        case JDWP.EventKind.VM_DEATH:
                             aEventsCommon = new VMDeath(vm, ps);
                            break;
                    }
                }

                Notification of initialization of a target VM.  This event is 
received before the main thread is started and before any 
application code has been executed. Before this event occurs 
a significant amount of system code has executed and a number 
of system classes have been loaded. 
This event is always generated by the target VM, even 
if not explicitly requested.
/**
                 * Notification of initialization of a target VM.  This event is 
                 * received before the main thread is started and before any 
                 * application code has been executed. Before this event occurs 
                 * a significant amount of system code has executed and a number 
                 * of system classes have been loaded. 
                 * This event is always generated by the target VM, even 
                 * if not explicitly requested.
                 */
                static class VMStart extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.VM_START;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event (or 0 if this 
event is automatically generated.
/**
                     * Request that generated event (or 0 if this 
                     * event is automatically generated.
                     */
                    final int requestID;

                    Initial thread
/**
                     * Initial thread
                     */
                    final ThreadReferenceImpl thread;

                    VMStart(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                    }
                }

                Notification of step completion in the target VM. The step event 
is generated before the code at its location is executed. 
/**
                 * Notification of step completion in the target VM. The step event 
                 * is generated before the code at its location is executed. 
                 */
                static class SingleStep extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.SINGLE_STEP;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Stepped thread
/**
                     * Stepped thread
                     */
                    final ThreadReferenceImpl thread;

                    Location stepped to
/**
                     * Location stepped to
                     */
                    final Location location;

                    SingleStep(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                    }
                }

                Notification of a breakpoint in the target VM. The breakpoint event 
is generated before the code at its location is executed. 
/**
                 * Notification of a breakpoint in the target VM. The breakpoint event 
                 * is generated before the code at its location is executed. 
                 */
                static class Breakpoint extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.BREAKPOINT;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which hit breakpoint
/**
                     * Thread which hit breakpoint
                     */
                    final ThreadReferenceImpl thread;

                    Location hit
/**
                     * Location hit
                     */
                    final Location location;

                    Breakpoint(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                    }
                }

                Notification of a method invocation in the target VM. This event 
is generated before any code in the invoked method has executed. 
Method entry events are generated for both native and non-native 
methods. 

In some VMs method entry events can occur for a particular thread 
before its thread start event occurs if methods are called 
as part of the thread's initialization. 
/**
                 * Notification of a method invocation in the target VM. This event 
                 * is generated before any code in the invoked method has executed. 
                 * Method entry events are generated for both native and non-native 
                 * methods. 
                 * <P>
                 * In some VMs method entry events can occur for a particular thread 
                 * before its thread start event occurs if methods are called 
                 * as part of the thread's initialization. 
                 */
                static class MethodEntry extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.METHOD_ENTRY;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which entered method
/**
                     * Thread which entered method
                     */
                    final ThreadReferenceImpl thread;

                    The initial executable location in the method.
/**
                     * The initial executable location in the method.
                     */
                    final Location location;

                    MethodEntry(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                    }
                }

                Notification of a method return in the target VM. This event 
is generated after all code in the method has executed, but the 
location of this event is the last executed location in the method. 
Method exit events are generated for both native and non-native 
methods. Method exit events are not generated if the method terminates 
with a thrown exception. 
/**
                 * Notification of a method return in the target VM. This event 
                 * is generated after all code in the method has executed, but the 
                 * location of this event is the last executed location in the method. 
                 * Method exit events are generated for both native and non-native 
                 * methods. Method exit events are not generated if the method terminates 
                 * with a thrown exception. 
                 */
                static class MethodExit extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.METHOD_EXIT;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which exited method
/**
                     * Thread which exited method
                     */
                    final ThreadReferenceImpl thread;

                    Location of exit
/**
                     * Location of exit
                     */
                    final Location location;

                    MethodExit(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                    }
                }

                Notification of a method return in the target VM. This event 
is generated after all code in the method has executed, but the 
location of this event is the last executed location in the method. 
Method exit events are generated for both native and non-native 
methods. Method exit events are not generated if the method terminates 
with a thrown exception. Since JDWP version 1.6. 
/**
                 * Notification of a method return in the target VM. This event 
                 * is generated after all code in the method has executed, but the 
                 * location of this event is the last executed location in the method. 
                 * Method exit events are generated for both native and non-native 
                 * methods. Method exit events are not generated if the method terminates 
                 * with a thrown exception. <p>Since JDWP version 1.6. 
                 */
                static class MethodExitWithReturnValue extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.METHOD_EXIT_WITH_RETURN_VALUE;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which exited method
/**
                     * Thread which exited method
                     */
                    final ThreadReferenceImpl thread;

                    Location of exit
/**
                     * Location of exit
                     */
                    final Location location;

                    Value that will be returned by the method
/**
                     * Value that will be returned by the method
                     */
                    final ValueImpl value;

                    MethodExitWithReturnValue(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                        value = ps.readValue();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "value(ValueImpl): " + value);
                        }
                    }
                }

                Notification that a thread in the target VM is attempting 
to enter a monitor that is already acquired by another thread. 
Requires canRequestMonitorEvents capability - see 
CapabilitiesNew. 
Since JDWP version 1.6. 
/**
                 * Notification that a thread in the target VM is attempting 
                 * to enter a monitor that is already acquired by another thread. 
                 * Requires canRequestMonitorEvents capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>. 
                 * <p>Since JDWP version 1.6. 
                 */
                static class MonitorContendedEnter extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.MONITOR_CONTENDED_ENTER;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which is trying to enter the monitor
/**
                     * Thread which is trying to enter the monitor
                     */
                    final ThreadReferenceImpl thread;

                    Monitor object reference
/**
                     * Monitor object reference
                     */
                    final ObjectReferenceImpl object;

                    Location of contended monitor enter
/**
                     * Location of contended monitor enter
                     */
                    final Location location;

                    MonitorContendedEnter(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        object = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                    }
                }

                Notification of a thread in the target VM is entering a monitor 
after waiting for it to be released by another thread. 
Requires canRequestMonitorEvents capability - see 
CapabilitiesNew. 
Since JDWP version 1.6. 
/**
                 * Notification of a thread in the target VM is entering a monitor 
                 * after waiting for it to be released by another thread. 
                 * Requires canRequestMonitorEvents capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>. 
                 * <p>Since JDWP version 1.6. 
                 */
                static class MonitorContendedEntered extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.MONITOR_CONTENDED_ENTERED;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which entered monitor
/**
                     * Thread which entered monitor
                     */
                    final ThreadReferenceImpl thread;

                    Monitor object reference
/**
                     * Monitor object reference
                     */
                    final ObjectReferenceImpl object;

                    Location of contended monitor enter
/**
                     * Location of contended monitor enter
                     */
                    final Location location;

                    MonitorContendedEntered(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        object = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                    }
                }

                Notification of a thread about to wait on a monitor object. 
Requires canRequestMonitorEvents capability - see 
CapabilitiesNew. 
Since JDWP version 1.6. 
/**
                 * Notification of a thread about to wait on a monitor object. 
                 * Requires canRequestMonitorEvents capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>. 
                 * <p>Since JDWP version 1.6. 
                 */
                static class MonitorWait extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.MONITOR_WAIT;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which is about to wait
/**
                     * Thread which is about to wait
                     */
                    final ThreadReferenceImpl thread;

                    Monitor object reference
/**
                     * Monitor object reference
                     */
                    final ObjectReferenceImpl object;

                    Location at which the wait will occur
/**
                     * Location at which the wait will occur
                     */
                    final Location location;

                    Thread wait time in milliseconds
/**
                     * Thread wait time in milliseconds
                     */
                    final long timeout;

                    MonitorWait(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        object = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                        timeout = ps.readLong();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "timeout(long): " + timeout);
                        }
                    }
                }

                Notification that a thread in the target VM has finished waiting on 
Requires canRequestMonitorEvents capability - see 
CapabilitiesNew. 
a monitor object. 
Since JDWP version 1.6. 
/**
                 * Notification that a thread in the target VM has finished waiting on 
                 * Requires canRequestMonitorEvents capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>. 
                 * a monitor object. 
                 * <p>Since JDWP version 1.6. 
                 */
                static class MonitorWaited extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.MONITOR_WAITED;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread which waited
/**
                     * Thread which waited
                     */
                    final ThreadReferenceImpl thread;

                    Monitor object reference
/**
                     * Monitor object reference
                     */
                    final ObjectReferenceImpl object;

                    Location at which the wait occured
/**
                     * Location at which the wait occured
                     */
                    final Location location;

                    True if timed out
/**
                     * True if timed out
                     */
                    final boolean timed_out;

                    MonitorWaited(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        object = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                        timed_out = ps.readBoolean();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "timed_out(boolean): " + timed_out);
                        }
                    }
                }

                Notification of an exception in the target VM. 
If the exception is thrown from a non-native method, 
the exception event is generated at the location where the 
exception is thrown. 
If the exception is thrown from a native method, the exception event 
is generated at the first non-native location reached after the exception 
is thrown. 
/**
                 * Notification of an exception in the target VM. 
                 * If the exception is thrown from a non-native method, 
                 * the exception event is generated at the location where the 
                 * exception is thrown. 
                 * If the exception is thrown from a native method, the exception event 
                 * is generated at the first non-native location reached after the exception 
                 * is thrown. 
                 */
                static class Exception extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.EXCEPTION;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Thread with exception
/**
                     * Thread with exception
                     */
                    final ThreadReferenceImpl thread;

                    Location of exception throw 
(or first non-native location after throw if thrown from a native method)
/**
                     * Location of exception throw 
                     * (or first non-native location after throw if thrown from a native method)
                     */
                    final Location location;

                    Thrown exception
/**
                     * Thrown exception
                     */
                    final ObjectReferenceImpl exception;

                    Location of catch, or 0 if not caught. An exception 
is considered to be caught if, at the point of the throw, the 
current location is dynamically enclosed in a try statement that 
handles the exception. (See the JVM specification for details). 
If there is such a try statement, the catch location is the 
first location in the appropriate catch clause. 

If there are native methods in the call stack at the time of the 
exception, there are important restrictions to note about the 
returned catch location. In such cases, 
it is not possible to predict whether an exception will be handled 
by some native method on the call stack. 
Thus, it is possible that exceptions considered uncaught 
here will, in fact, be handled by a native method and not cause 
termination of the target VM. Furthermore, it cannot be assumed that the 
catch location returned here will ever be reached by the throwing 
thread. If there is 
a native frame between the current location and the catch location, 
the exception might be handled and cleared in that native method 
instead. 

Note that compilers can generate try-catch blocks in some cases 
where they are not explicit in the source code; for example, 
the code generated for synchronized and 
finally blocks can contain implicit try-catch blocks. 
If such an implicitly generated try-catch is 
present on the call stack at the time of the throw, the exception 
will be considered caught even though it appears to be uncaught from 
examination of the source code. 
/**
                     * Location of catch, or 0 if not caught. An exception 
                     * is considered to be caught if, at the point of the throw, the 
                     * current location is dynamically enclosed in a try statement that 
                     * handles the exception. (See the JVM specification for details). 
                     * If there is such a try statement, the catch location is the 
                     * first location in the appropriate catch clause. 
                     * <p>
                     * If there are native methods in the call stack at the time of the 
                     * exception, there are important restrictions to note about the 
                     * returned catch location. In such cases, 
                     * it is not possible to predict whether an exception will be handled 
                     * by some native method on the call stack. 
                     * Thus, it is possible that exceptions considered uncaught 
                     * here will, in fact, be handled by a native method and not cause 
                     * termination of the target VM. Furthermore, it cannot be assumed that the 
                     * catch location returned here will ever be reached by the throwing 
                     * thread. If there is 
                     * a native frame between the current location and the catch location, 
                     * the exception might be handled and cleared in that native method 
                     * instead. 
                     * <p>
                     * Note that compilers can generate try-catch blocks in some cases 
                     * where they are not explicit in the source code; for example, 
                     * the code generated for <code>synchronized</code> and 
                     * <code>finally</code> blocks can contain implicit try-catch blocks. 
                     * If such an implicitly generated try-catch is 
                     * present on the call stack at the time of the throw, the exception 
                     * will be considered caught even though it appears to be uncaught from 
                     * examination of the source code. 
                     */
                    final Location catchLocation;

                    Exception(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                        exception = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "exception(ObjectReferenceImpl): " + (exception==null?"NULL":"ref="+exception.ref()));
                        }
                        catchLocation = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "catchLocation(Location): " + catchLocation);
                        }
                    }
                }

                Notification of a new running thread in the target VM. 
The new thread can be the result of a call to 
java.lang.Thread.start or the result of 
attaching a new thread to the VM though JNI. The 
notification is generated by the new thread some time before 
its execution starts. 
Because of this timing, it is possible to receive other events 
for the thread before this event is received. (Notably, 
Method Entry Events and Method Exit Events might occur 
during thread initialization. 
It is also possible for the 
VirtualMachine AllThreads 
command to return 
a thread before its thread start event is received. 

Note that this event gives no information 
about the creation of the thread object which may have happened 
much earlier, depending on the VM being debugged. 
/**
                 * Notification of a new running thread in the target VM. 
                 * The new thread can be the result of a call to 
                 * <code>java.lang.Thread.start</code> or the result of 
                 * attaching a new thread to the VM though JNI. The 
                 * notification is generated by the new thread some time before 
                 * its execution starts. 
                 * Because of this timing, it is possible to receive other events 
                 * for the thread before this event is received. (Notably, 
                 * Method Entry Events and Method Exit Events might occur 
                 * during thread initialization. 
                 * It is also possible for the 
                 * <a href="#JDWP_VirtualMachine_AllThreads">VirtualMachine AllThreads</a> 
                 * command to return 
                 * a thread before its thread start event is received. 
                 * <p>
                 * Note that this event gives no information 
                 * about the creation of the thread object which may have happened 
                 * much earlier, depending on the VM being debugged. 
                 */
                static class ThreadStart extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.THREAD_START;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Started thread
/**
                     * Started thread
                     */
                    final ThreadReferenceImpl thread;

                    ThreadStart(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                    }
                }

                Notification of a completed thread in the target VM. The notification is generated by the dying thread before it terminates. Because of this timing, it is possible for VirtualMachine.allThreads to return this thread after this event is received. 
Note that this event gives no information 
about the lifetime of the thread object. It may or may not be collected 
soon depending on what references exist in the target VM. 
/**
                 * Notification of a completed thread in the target VM. The 
                 * notification is generated by the dying thread before it terminates. 
                 * Because of this timing, it is possible 
                 * for {@link VirtualMachine#allThreads} to return this thread 
                 * after this event is received. 
                 * <p>
                 * Note that this event gives no information 
                 * about the lifetime of the thread object. It may or may not be collected 
                 * soon depending on what references exist in the target VM. 
                 */
                static class ThreadDeath extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.THREAD_DEATH;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Ending thread
/**
                     * Ending thread
                     */
                    final ThreadReferenceImpl thread;

                    ThreadDeath(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                    }
                }

                Notification of a class prepare in the target VM. See the JVM 
specification for a definition of class preparation. Class prepare 
events are not generated for primtiive classes (for example, 
java.lang.Integer.TYPE). 
/**
                 * Notification of a class prepare in the target VM. See the JVM 
                 * specification for a definition of class preparation. Class prepare 
                 * events are not generated for primtiive classes (for example, 
                 * java.lang.Integer.TYPE). 
                 */
                static class ClassPrepare extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.CLASS_PREPARE;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Preparing thread. 
In rare cases, this event may occur in a debugger system 
thread within the target VM. Debugger threads take precautions 
to prevent these events, but they cannot be avoided under some 
conditions, especially for some subclasses of 
java.lang.Error. 
If the event was generated by a debugger system thread, the 
value returned by this method is null, and if the requested  
suspend policy 
for the event was EVENT_THREAD 
all threads will be suspended instead, and the 
composite event's suspend policy will reflect this change. 

Note that the discussion above does not apply to system threads 
created by the target VM during its normal (non-debug) operation. 
/**
                     * Preparing thread. 
                     * In rare cases, this event may occur in a debugger system 
                     * thread within the target VM. Debugger threads take precautions 
                     * to prevent these events, but they cannot be avoided under some 
                     * conditions, especially for some subclasses of 
                     * java.lang.Error. 
                     * If the event was generated by a debugger system thread, the 
                     * value returned by this method is null, and if the requested  
                     * <a href="#JDWP_SuspendPolicy">suspend policy</a> 
                     * for the event was EVENT_THREAD 
                     * all threads will be suspended instead, and the 
                     * composite event's suspend policy will reflect this change. 
                     * <p>
                     * Note that the discussion above does not apply to system threads 
                     * created by the target VM during its normal (non-debug) operation. 
                     */
                    final ThreadReferenceImpl thread;

                    Kind of reference type. 
See JDWP.TypeTag
/**
                     * Kind of reference type. 
                     * See <a href="#JDWP_TypeTag">JDWP.TypeTag</a>
                     */
                    final byte refTypeTag;

                    Type being prepared
/**
                     * Type being prepared
                     */
                    final long typeID;

                    Type signature
/**
                     * Type signature
                     */
                    final String signature;

                    Status of type. 
See JDWP.ClassStatus
/**
                     * Status of type. 
                     * See <a href="#JDWP_ClassStatus">JDWP.ClassStatus</a>
                     */
                    final int status;

                    ClassPrepare(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        refTypeTag = ps.readByte();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "refTypeTag(byte): " + refTypeTag);
                        }
                        typeID = ps.readClassRef();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "typeID(long): " + "ref="+typeID);
                        }
                        signature = ps.readString();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "signature(String): " + signature);
                        }
                        status = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "status(int): " + status);
                        }
                    }
                }

                Notification of a class unload in the target VM. 

There are severe constraints on the debugger back-end during 
garbage collection, so unload information is greatly limited. 
/**
                 * Notification of a class unload in the target VM. 
                 * <p>
                 * There are severe constraints on the debugger back-end during 
                 * garbage collection, so unload information is greatly limited. 
                 */
                static class ClassUnload extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.CLASS_UNLOAD;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Type signature
/**
                     * Type signature
                     */
                    final String signature;

                    ClassUnload(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        signature = ps.readString();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "signature(String): " + signature);
                        }
                    }
                }

                Notification of a field access in the target VM. 
Field modifications 
are not considered field accesses. 
Requires canWatchFieldAccess capability - see 
CapabilitiesNew.
/**
                 * Notification of a field access in the target VM. 
                 * Field modifications 
                 * are not considered field accesses. 
                 * Requires canWatchFieldAccess capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
                 */
                static class FieldAccess extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.FIELD_ACCESS;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Accessing thread
/**
                     * Accessing thread
                     */
                    final ThreadReferenceImpl thread;

                    Location of access
/**
                     * Location of access
                     */
                    final Location location;

                    Kind of reference type. 
See JDWP.TypeTag
/**
                     * Kind of reference type. 
                     * See <a href="#JDWP_TypeTag">JDWP.TypeTag</a>
                     */
                    final byte refTypeTag;

                    Type of field
/**
                     * Type of field
                     */
                    final long typeID;

                    Field being accessed
/**
                     * Field being accessed
                     */
                    final long fieldID;

                    Object being accessed (null=0 for statics
/**
                     * Object being accessed (null=0 for statics
                     */
                    final ObjectReferenceImpl object;

                    FieldAccess(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                        refTypeTag = ps.readByte();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "refTypeTag(byte): " + refTypeTag);
                        }
                        typeID = ps.readClassRef();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "typeID(long): " + "ref="+typeID);
                        }
                        fieldID = ps.readFieldRef();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "fieldID(long): " + fieldID);
                        }
                        object = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                        }
                    }
                }

                Notification of a field modification in the target VM. 
Requires canWatchFieldModification capability - see 
CapabilitiesNew.
/**
                 * Notification of a field modification in the target VM. 
                 * Requires canWatchFieldModification capability - see 
                 * <a href="#JDWP_VirtualMachine_CapabilitiesNew">CapabilitiesNew</a>.
                 */
                static class FieldModification extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.FIELD_MODIFICATION;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    Modifying thread
/**
                     * Modifying thread
                     */
                    final ThreadReferenceImpl thread;

                    Location of modify
/**
                     * Location of modify
                     */
                    final Location location;

                    Kind of reference type. 
See JDWP.TypeTag
/**
                     * Kind of reference type. 
                     * See <a href="#JDWP_TypeTag">JDWP.TypeTag</a>
                     */
                    final byte refTypeTag;

                    Type of field
/**
                     * Type of field
                     */
                    final long typeID;

                    Field being modified
/**
                     * Field being modified
                     */
                    final long fieldID;

                    Object being modified (null=0 for statics
/**
                     * Object being modified (null=0 for statics
                     */
                    final ObjectReferenceImpl object;

                    Value to be assigned
/**
                     * Value to be assigned
                     */
                    final ValueImpl valueToBe;

                    FieldModification(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                        thread = ps.readThreadReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "thread(ThreadReferenceImpl): " + (thread==null?"NULL":"ref="+thread.ref()));
                        }
                        location = ps.readLocation();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "location(Location): " + location);
                        }
                        refTypeTag = ps.readByte();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "refTypeTag(byte): " + refTypeTag);
                        }
                        typeID = ps.readClassRef();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "typeID(long): " + "ref="+typeID);
                        }
                        fieldID = ps.readFieldRef();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "fieldID(long): " + fieldID);
                        }
                        object = ps.readTaggedObjectReference();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "object(ObjectReferenceImpl): " + (object==null?"NULL":"ref="+object.ref()));
                        }
                        valueToBe = ps.readValue();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "valueToBe(ValueImpl): " + valueToBe);
                        }
                    }
                }

                static class VMDeath extends EventsCommon {
                    static final byte ALT_ID = JDWP.EventKind.VM_DEATH;
                    byte eventKind() {
                        return ALT_ID;
                    }

                    Request that generated event
/**
                     * Request that generated event
                     */
                    final int requestID;

                    VMDeath(VirtualMachineImpl vm, PacketStream ps) {
                        requestID = ps.readInt();
                        if (vm.traceReceives) {
                            vm.printReceiveTrace(6, "requestID(int): " + requestID);
                        }
                    }
                }
            }


            Which threads where suspended by this composite event?
/**
             * Which threads where suspended by this composite event?
             */
            final byte suspendPolicy;

            Events in set.
/**
             * Events in set.
             */
            final Events[] events;

            Composite(VirtualMachineImpl vm, PacketStream ps) {
                if (vm.traceReceives) {
                    vm.printTrace("Receiving Command(id=" + ps.pkt.id + ") JDWP.Event.Composite"+(ps.pkt.flags!=0?", FLAGS=" + ps.pkt.flags:"")+(ps.pkt.errorCode!=0?", ERROR CODE=" + ps.pkt.errorCode:""));
                }
                suspendPolicy = ps.readByte();
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "suspendPolicy(byte): " + suspendPolicy);
                }
                if (vm.traceReceives) {
                    vm.printReceiveTrace(4, "events(Events[]): " + "");
                }
                int eventsCount = ps.readInt();
                events = new Events[eventsCount];
                for (int i = 0; i < eventsCount; i++) {;
                    if (vm.traceReceives) {
                        vm.printReceiveTrace(5, "events[i](Events): " + "");
                    }
                    events[i] = new Events(vm, ps);
                }
            }
        }
    }

    static class Error {
        static final int NONE = 0;
        static final int INVALID_THREAD = 10;
        static final int INVALID_THREAD_GROUP = 11;
        static final int INVALID_PRIORITY = 12;
        static final int THREAD_NOT_SUSPENDED = 13;
        static final int THREAD_SUSPENDED = 14;
        static final int THREAD_NOT_ALIVE = 15;
        static final int INVALID_OBJECT = 20;
        static final int INVALID_CLASS = 21;
        static final int CLASS_NOT_PREPARED = 22;
        static final int INVALID_METHODID = 23;
        static final int INVALID_LOCATION = 24;
        static final int INVALID_FIELDID = 25;
        static final int INVALID_FRAMEID = 30;
        static final int NO_MORE_FRAMES = 31;
        static final int OPAQUE_FRAME = 32;
        static final int NOT_CURRENT_FRAME = 33;
        static final int TYPE_MISMATCH = 34;
        static final int INVALID_SLOT = 35;
        static final int DUPLICATE = 40;
        static final int NOT_FOUND = 41;
        static final int INVALID_MODULE = 42;
        static final int INVALID_MONITOR = 50;
        static final int NOT_MONITOR_OWNER = 51;
        static final int INTERRUPT = 52;
        static final int INVALID_CLASS_FORMAT = 60;
        static final int CIRCULAR_CLASS_DEFINITION = 61;
        static final int FAILS_VERIFICATION = 62;
        static final int ADD_METHOD_NOT_IMPLEMENTED = 63;
        static final int SCHEMA_CHANGE_NOT_IMPLEMENTED = 64;
        static final int INVALID_TYPESTATE = 65;
        static final int HIERARCHY_CHANGE_NOT_IMPLEMENTED = 66;
        static final int DELETE_METHOD_NOT_IMPLEMENTED = 67;
        static final int UNSUPPORTED_VERSION = 68;
        static final int NAMES_DONT_MATCH = 69;
        static final int CLASS_MODIFIERS_CHANGE_NOT_IMPLEMENTED = 70;
        static final int METHOD_MODIFIERS_CHANGE_NOT_IMPLEMENTED = 71;
        static final int CLASS_ATTRIBUTE_CHANGE_NOT_IMPLEMENTED = 72;
        static final int NOT_IMPLEMENTED = 99;
        static final int NULL_POINTER = 100;
        static final int ABSENT_INFORMATION = 101;
        static final int INVALID_EVENT_TYPE = 102;
        static final int ILLEGAL_ARGUMENT = 103;
        static final int OUT_OF_MEMORY = 110;
        static final int ACCESS_DENIED = 111;
        static final int VM_DEAD = 112;
        static final int INTERNAL = 113;
        static final int UNATTACHED_THREAD = 115;
        static final int INVALID_TAG = 500;
        static final int ALREADY_INVOKING = 502;
        static final int INVALID_INDEX = 503;
        static final int INVALID_LENGTH = 504;
        static final int INVALID_STRING = 506;
        static final int INVALID_CLASS_LOADER = 507;
        static final int INVALID_ARRAY = 508;
        static final int TRANSPORT_LOAD = 509;
        static final int TRANSPORT_INIT = 510;
        static final int NATIVE_METHOD = 511;
        static final int INVALID_COUNT = 512;
    }

    static class EventKind {
        static final int SINGLE_STEP = 1;
        static final int BREAKPOINT = 2;
        static final int FRAME_POP = 3;
        static final int EXCEPTION = 4;
        static final int USER_DEFINED = 5;
        static final int THREAD_START = 6;
        static final int THREAD_DEATH = 7;
        static final int THREAD_END = 7;
        static final int CLASS_PREPARE = 8;
        static final int CLASS_UNLOAD = 9;
        static final int CLASS_LOAD = 10;
        static final int FIELD_ACCESS = 20;
        static final int FIELD_MODIFICATION = 21;
        static final int EXCEPTION_CATCH = 30;
        static final int METHOD_ENTRY = 40;
        static final int METHOD_EXIT = 41;
        static final int METHOD_EXIT_WITH_RETURN_VALUE = 42;
        static final int MONITOR_CONTENDED_ENTER = 43;
        static final int MONITOR_CONTENDED_ENTERED = 44;
        static final int MONITOR_WAIT = 45;
        static final int MONITOR_WAITED = 46;
        static final int VM_START = 90;
        static final int VM_INIT = 90;
        static final int VM_DEATH = 99;
        static final int VM_DISCONNECTED = 100;
    }

    static class ThreadStatus {
        static final int ZOMBIE = 0;
        static final int RUNNING = 1;
        static final int SLEEPING = 2;
        static final int MONITOR = 3;
        static final int WAIT = 4;
    }

    static class SuspendStatus {
        static final int SUSPEND_STATUS_SUSPENDED = 0x1;
    }

    static class ClassStatus {
        static final int VERIFIED = 1;
        static final int PREPARED = 2;
        static final int INITIALIZED = 4;
        static final int ERROR = 8;
    }

    static class TypeTag {
        static final int CLASS = 1;
        static final int INTERFACE = 2;
        static final int ARRAY = 3;
    }

    static class Tag {
        static final int ARRAY = 91;
        static final int BYTE = 66;
        static final int CHAR = 67;
        static final int OBJECT = 76;
        static final int FLOAT = 70;
        static final int DOUBLE = 68;
        static final int INT = 73;
        static final int LONG = 74;
        static final int SHORT = 83;
        static final int VOID = 86;
        static final int BOOLEAN = 90;
        static final int STRING = 115;
        static final int THREAD = 116;
        static final int THREAD_GROUP = 103;
        static final int CLASS_LOADER = 108;
        static final int CLASS_OBJECT = 99;
    }

    static class StepDepth {
        static final int INTO = 0;
        static final int OVER = 1;
        static final int OUT = 2;
    }

    static class StepSize {
        static final int MIN = 0;
        static final int LINE = 1;
    }

    static class SuspendPolicy {
        static final int NONE = 0;
        static final int EVENT_THREAD = 1;
        static final int ALL = 2;
    }

    The invoke options are a combination of zero or more of the following bit flags:
/**
     * The invoke options are a combination of zero or more of the following bit flags:
     */
    static class InvokeOptions {
        static final int INVOKE_SINGLE_THREADED = 0x01;
        static final int INVOKE_NONVIRTUAL = 0x02;
    }
}
/

java/ 17/ jdk.jdi/com/sun/tools/jdi/JDWP.java
