throws JdwpException
  private void _enforceSuspendPolicy (byte suspendPolicy)  {    switch (suspendPolicy)      {      case EventRequest.SUSPEND_NONE:	// do nothing	break;      case EventRequest.SUSPEND_THREAD:	VMVirtualMachine.suspendThread (this);	break;      case EventRequest.SUSPEND_ALL:	VMVirtualMachine.suspendAllThreads ();	break;      }  }