https://ant.apache.org/: master POM (The Apache Software Foundation) 
public class org.apache.tools.ant.taskdefs.ExecuteWatchdog implements org.apache.tools.ant.util.TimeoutObserver
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.tools.ant.taskdefs.ExecuteWatchdog
  super_class: java.lang.Object
{
  private java.lang.Process process;
    descriptor: Ljava/lang/Process;
    flags: (0x0002) ACC_PRIVATE

  private volatile boolean watch;
    descriptor: Z
    flags: (0x0042) ACC_PRIVATE, ACC_VOLATILE

  private java.lang.Exception caught;
    descriptor: Ljava/lang/Exception;
    flags: (0x0002) ACC_PRIVATE

  private volatile boolean killedProcess;
    descriptor: Z
    flags: (0x0042) ACC_PRIVATE, ACC_VOLATILE

  private org.apache.tools.ant.util.Watchdog watchdog;
    descriptor: Lorg/apache/tools/ant/util/Watchdog;
    flags: (0x0002) ACC_PRIVATE

  public void <init>(long);
    descriptor: (J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
        start local 1 // long timeout
         0: .line 65
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 48
            aload 0 /* this */
            iconst_0
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watch:Z
         2: .line 51
            aload 0 /* this */
            aconst_null
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.caught:Ljava/lang/Exception;
         3: .line 54
            aload 0 /* this */
            iconst_0
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.killedProcess:Z
         4: .line 66
            aload 0 /* this */
            new org.apache.tools.ant.util.Watchdog
            dup
            lload 1 /* timeout */
            invokespecial org.apache.tools.ant.util.Watchdog.<init>:(J)V
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watchdog:Lorg/apache/tools/ant/util/Watchdog;
         5: .line 67
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watchdog:Lorg/apache/tools/ant/util/Watchdog;
            aload 0 /* this */
            invokevirtual org.apache.tools.ant.util.Watchdog.addTimeoutObserver:(Lorg/apache/tools/ant/util/TimeoutObserver;)V
         6: .line 68
            return
        end local 1 // long timeout
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0     this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;
            0    7     1  timeout  J
    MethodParameters:
         Name  Flags
      timeout  

  public void <init>(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
        start local 1 // int timeout
         0: .line 79
            aload 0 /* this */
            iload 1 /* timeout */
            i2l
            invokespecial org.apache.tools.ant.taskdefs.ExecuteWatchdog.<init>:(J)V
         1: .line 80
            return
        end local 1 // int timeout
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;
            0    2     1  timeout  I
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
         Name  Flags
      timeout  

  public synchronized void start(java.lang.Process);
    descriptor: (Ljava/lang/Process;)V
    flags: (0x0021) ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
        start local 1 // java.lang.Process process
         0: .line 89
            aload 1 /* process */
            ifnonnull 2
         1: .line 90
            new java.lang.NullPointerException
            dup
            ldc "process is null."
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 92
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.process:Ljava/lang/Process;
            ifnull 4
         3: .line 93
            new java.lang.IllegalStateException
            dup
            ldc "Already running."
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 95
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aconst_null
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.caught:Ljava/lang/Exception;
         5: .line 96
            aload 0 /* this */
            iconst_0
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.killedProcess:Z
         6: .line 97
            aload 0 /* this */
            iconst_1
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watch:Z
         7: .line 98
            aload 0 /* this */
            aload 1 /* process */
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.process:Ljava/lang/Process;
         8: .line 99
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watchdog:Lorg/apache/tools/ant/util/Watchdog;
            invokevirtual org.apache.tools.ant.util.Watchdog.start:()V
         9: .line 100
            return
        end local 1 // java.lang.Process process
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   10     0     this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;
            0   10     1  process  Ljava/lang/Process;
    MethodParameters:
         Name  Flags
      process  

  public synchronized void stop();
    descriptor: ()V
    flags: (0x0021) ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
         0: .line 107
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watchdog:Lorg/apache/tools/ant/util/Watchdog;
            invokevirtual org.apache.tools.ant.util.Watchdog.stop:()V
         1: .line 108
            aload 0 /* this */
            invokevirtual org.apache.tools.ant.taskdefs.ExecuteWatchdog.cleanUp:()V
         2: .line 109
            return
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;

  public synchronized void timeoutOccured(org.apache.tools.ant.util.Watchdog);
    descriptor: (Lorg/apache/tools/ant/util/Watchdog;)V
    flags: (0x0021) ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
        start local 1 // org.apache.tools.ant.util.Watchdog w
         0: .line 122
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.process:Ljava/lang/Process;
            invokevirtual java.lang.Process.exitValue:()I
            pop
         1: .line 123
            goto 13
      StackMap locals:
      StackMap stack: java.lang.IllegalThreadStateException
         2: pop
         3: .line 126
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watch:Z
            ifeq 13
         4: .line 127
            aload 0 /* this */
            iconst_1
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.killedProcess:Z
         5: .line 128
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.process:Ljava/lang/Process;
            invokevirtual java.lang.Process.destroy:()V
         6: .line 131
            goto 13
      StackMap locals:
      StackMap stack: java.lang.Exception
         7: astore 2 /* e */
        start local 2 // java.lang.Exception e
         8: .line 132
            aload 0 /* this */
            aload 2 /* e */
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.caught:Ljava/lang/Exception;
        end local 2 // java.lang.Exception e
         9: .line 134
            aload 0 /* this */
            invokevirtual org.apache.tools.ant.taskdefs.ExecuteWatchdog.cleanUp:()V
            goto 14
        10: .line 133
      StackMap locals:
      StackMap stack: java.lang.Throwable
            astore 3
        11: .line 134
            aload 0 /* this */
            invokevirtual org.apache.tools.ant.taskdefs.ExecuteWatchdog.cleanUp:()V
        12: .line 135
            aload 3
            athrow
        13: .line 134
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual org.apache.tools.ant.taskdefs.ExecuteWatchdog.cleanUp:()V
        14: .line 136
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.apache.tools.ant.util.Watchdog w
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   15     0  this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;
            0   15     1     w  Lorg/apache/tools/ant/util/Watchdog;
            8    9     2     e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.IllegalThreadStateException
           0     6       7  Class java.lang.Exception
           0     9      10  any
    MethodParameters:
      Name  Flags
      w     

  protected synchronized void cleanUp();
    descriptor: ()V
    flags: (0x0024) ACC_PROTECTED, ACC_SYNCHRONIZED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
         0: .line 142
            aload 0 /* this */
            iconst_0
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watch:Z
         1: .line 143
            aload 0 /* this */
            aconst_null
            putfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.process:Ljava/lang/Process;
         2: .line 144
            return
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;

  public synchronized void checkException();
    descriptor: ()V
    flags: (0x0021) ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
         0: .line 155
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.caught:Ljava/lang/Exception;
            ifnull 4
         1: .line 156
            new org.apache.tools.ant.BuildException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Exception in ExecuteWatchdog.run: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         2: .line 157
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.caught:Ljava/lang/Exception;
            invokevirtual java.lang.Exception.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.caught:Ljava/lang/Exception;
         3: .line 156
            invokespecial org.apache.tools.ant.BuildException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
         4: .line 159
      StackMap locals:
      StackMap stack:
            return
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;
    Exceptions:
      throws org.apache.tools.ant.BuildException

  public boolean isWatching();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
         0: .line 167
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.watch:Z
            ireturn
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;

  public boolean killedProcess();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
         0: .line 176
            aload 0 /* this */
            getfield org.apache.tools.ant.taskdefs.ExecuteWatchdog.killedProcess:Z
            ireturn
        end local 0 // org.apache.tools.ant.taskdefs.ExecuteWatchdog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tools/ant/taskdefs/ExecuteWatchdog;
}
SourceFile: "ExecuteWatchdog.java"