void cancel(String messageID, int consumerID) throws JMSException
protected void cancel(String messageID, int consumerID) throws JMSException
   void cancel(String messageID, int consumerID) throws JMSException   {      ServerConsumerEndpoint consumer = (ServerConsumerEndpoint)consumers.get(new Integer(consumerID));      if (consumer == null)      {         throw new IllegalStateException("Cannot find consumer:" + consumerID);      }      consumer.cancelMessage(messageID);   }