https://www.graalvm.org/ 
public interface com.oracle.truffle.api.debug.SuspendedCallback
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.debug.SuspendedCallback
  super_class: java.lang.Object
{
  public abstract void onSuspend(com.oracle.truffle.api.debug.SuspendedEvent);
    descriptor: (Lcom/oracle/truffle/api/debug/SuspendedEvent;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      event  
}
SourceFile: "SuspendedCallback.java"