code: @Override
      public MessageListener getMessageListener() throws JMSRuntimeException {
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "getMessageListener");
  
          MessageListener messageListener = null;
  
          try {
              messageListener = messageConsumer.getMessageListener();
          } catch (JMSException jmse) {
              throw (JMSRuntimeException) JmsErrorUtils.getJMS2Exception(jmse, JMSRuntimeException.class);
          } finally {
              if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
                  SibTr.exit(this, tc, "getMessageListener", messageListener);
          }
  
          return messageListener;
      }
docs: /*
  (non-Javadoc)
  
  @see javax.jms.JMSConsumer#getMessageListener()