Lookup of connections & queues

Question

I'm new to JMS, and would appreciate it if someone could please clear up this confusion...
There appear to be 2 ways to access a Queue object:
Method 1:  Through a session, i.e:
QueueConnection con= factory.createQueueConnection();
QueueSession session = con.createQueueSession(...);
Queue q= session.createQueue("queue:///MYQ");
Method 2:  Lookup through InitialContext (provided by vendor):
Context ctx=new InitialContext(...)
Queue  q=(Queue) ctx.lookup(...)I've managed to get it working both ways.
And I realize method 2 has the advantage of configuring queues/managers through your container admin, rather than inside the code.
But apart from that, are there any other important differences ? would it affect my application design or performaces ?
In particular, suppose we put aside the initialization times ( assume "ctx.looup" or "session.createQueue" are called once on application startup). Will there be a difference in performance - will it take longer to send/receive JMS messages ?
Thanks very much !

Answer 1

Hi,
If you have a look at the JavaDoc for the QueueSession.createQueue() it states the following:
"This facility is provided for the rare cases where clients need to dynamically manipulate queue identity. It allows the creation of a queue identity with a provider-specific name. Clients that depend on this ability are not portable.
Note that this method is not for creating the physical queue. The physical creation of queues is an administrative task and is not to be initiated by the JMS API. The one exception is the creation of temporary queues, which is accomplished with the createTemporaryQueue method."
From this, it looks like they are suggesting Method 2 as the preferred approach. I would doubt that there is a performance hit by using Method 1.....but I don't have any concrete information to support that inference. I hope this helps?
Cheers,
J.