code: @Override
  	public TopicConnection createTopicConnection() throws JMSException
      {
      	String username = getStringProperty(Context.SECURITY_PRINCIPAL,null); 
      	String password = getStringProperty(Context.SECURITY_CREDENTIALS,null);
      	
          return createTopicConnection(username,password);
      }
docs: /* (non-Javadoc)
  @see javax.jms.TopicConnectionFactory#createTopicConnection()