throws JdwpException
  public void deleteRequest (byte kind, int id)  {    Hashtable requests;    requests = (Hashtable) _requests.get (new Byte (kind));    if (requests == null)      {	// Did not get a valid event type	throw new IllegalArgumentException ("invalid event kind: " + kind);      }    Integer iid = new Integer (id);    EventRequest request = (EventRequest) requests.get (iid);    if (request != null)      {	VMVirtualMachine.unregisterEvent (request);	requests.remove (iid);      }  }