public void onMessage(final Destination destination, final Message message) {
      super.onMessage(destination, message);

      synchronized (_lock) {
        _lock.notifyAll();
      }
    }
 /** @see DestinationListener#onMessage(Destination, Message) */
 public void onMessage(final Destination destination, final Message message) {
   super.onMessage(destination, message);
   final String s = ((ByteMessage) message).getStringPayload();
   if (s.equalsIgnoreCase("rc=200")) {
     alertDialog("Subscription successful.");
   } else {
     alertDialog("Subscription failed.");
   }
 }