https://www.graalvm.org/ 
public interface com.oracle.truffle.api.debug.DebugThreadsListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.debug.DebugThreadsListener
  super_class: java.lang.Object
{
  public abstract void threadInitialized(com.oracle.truffle.api.debug.DebugContext, java.lang.Thread);
    descriptor: (Lcom/oracle/truffle/api/debug/DebugContext;Ljava/lang/Thread;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      context  
      thread   

  public abstract void threadDisposed(com.oracle.truffle.api.debug.DebugContext, java.lang.Thread);
    descriptor: (Lcom/oracle/truffle/api/debug/DebugContext;Ljava/lang/Thread;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      context  
      thread   
}
SourceFile: "DebugThreadsListener.java"