How does JMS Destination relates to a Connection Factory ?

Question

Hello,
I am new to JMS but have experience since 1995 with IBM MQseries, I like to understand how Connection Factories and Destination related to each other. I have looked at JMS documentation and seen the graphical representation but in MQ world we create a Queue Manger and a Queue under it. I have looke all over but can not explain this to myself.
In Sun�s Java Application Server version 9, I have created a Connection Factory called �jms/ConnectionFactory_abc� and then have created a Destination called �jms/destination_abc� and successfully sent and received messages, what I do not understand is that there is no menu option in Sun�s web based screen to related the 2 together!! How do they relate? Do they related becuase of my program logic?
What if you like to have same Destination names under 2 different Factories?
---------Code fragment without TRY/CATCH
queueConnectionFactory = (QueueConnectionFactory) jndiContext.lookup("jms/ConnectionFactory_abc ");
queue = (Queue) jndiContext.lookup(�jms/destination_abc �);
queueConnection = queueConnectionFactory.createQueueConnection();
queueSession = queueConnection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
queueSender = queueSession.createSender(queue);
message = queueSession.createTextMessage();
message.setText(input);
queueSender.send(message);
queueConnection.close();
Please advise
Thank You.
AA

Answer 1

I'll have a stab at this one, but may not be 100% right. Hopefully someone will point out anything I've got wrong.
A connection factory is used to obtain a connection to the JMS provider, which in the case of MQSeries is synonymous Queue Manager. The connection is used to initiate one or more conversations with the JMS provider / QM, which might include starting a new transactional session.
The destinations (Queues or Topics) are objects hosted by the JMS provider, however your client can only access these objects after establishing a connection / session, since it is the connection / session which determines the protocols and parameters to be used.
The JNDI lookups are just a way for your client to obtain a remote reference to the Connection Factory and Queue objects hosted by the JMS provider, without coupling your client with the underlying JMS implementation (i.e. MQSeries, JBossMQ, ActiveMQ etc). When these references are bound to the JNDI tree they are given names like "jms/ConnectionFactory_abc" and "jms/destination_abc", but are not related to each other. Attempting to bind two references with the same JNDI name (on the same JNDI server) will cause in an error. So while you can two identically named queues on separate queue managers, you would have to give them different JNDI names,
Hope this helps,
Steve