Spring JmsTemplate questions

[theoverlord]

First I'll describe my configuration.

I'm sending a message from a JBoss AS to a remote queue on another JBoss AS using Spring's infamous JmsTemplate to send the message.

I read the advice concerning the use of Spring's JmsTemplate but I inherited this code so i'm hesitant to remove all references to JmsTemplate.

I read that I can use Spring's SingleConnectionFactory to reuse the JMS connection.

I have some question about this though.

It's my understanding that a single QueueConnectionFactory can be shared among different threads - is that correct?

It's also my understanding that a single connection created from a QueueConnectionFactory can be shared by multiple threads - is that correct?

If that is all correct, then why do I keep on reading about JMS connection pooling if the connection can be shared ? If they can be shared, you don't need a pool, you just need one connection - right?

I think I'm not understanding something correctly.

Please enlighten me.

[clebert.suconic]

The problem with JMSTemplate on Spring is about the session.

Spring will create a JMSSession on every send:

session = conn.createSession(....);
....
producer = session.createProducer...
producer.send(....)



And those are expensive operations *on any* messaging system (as far as I know).

[theoverlord]

According to the JBoss Wiki relating to JmsTemplate, it's safe to use JmsTemplate so long as it's used in a Jboss AS when using the connection factory from "java:/JmsXA".

[clebert.suconic]

According to the JBoss Wiki relating to JmsTemplate, it's safe to use JmsTemplate so long as it's used in a Jboss AS when using the connection factory from "java:/JmsXA".

I assumed you knew that...

I'm just saying why you need to ensure you use java:/JmsXA.

[theoverlord]

Even though it's safe to use the JmsTemplate in some specific cases, are you saying it may not be the most efficient in those cases?

[timfox]

"TheOverlord" wrote:
According to the JBoss Wiki relating to JmsTemplate, it's safe to use JmsTemplate so long as it's used in a Jboss AS when using the connection factory from "java:/JmsXA".

And even then, it's only safe for sending messages, not consuming them.