https://www.graalvm.org/ 
public interface com.oracle.truffle.api.instrumentation.ThreadsActivationListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.instrumentation.ThreadsActivationListener
  super_class: java.lang.Object
{
  public abstract void onEnterThread(com.oracle.truffle.api.TruffleContext);
    descriptor: (Lcom/oracle/truffle/api/TruffleContext;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      context  

  public abstract void onLeaveThread(com.oracle.truffle.api.TruffleContext);
    descriptor: (Lcom/oracle/truffle/api/TruffleContext;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      context  
}
SourceFile: "ThreadsActivationListener.java"