[jboss-jira] [JBoss JIRA] Created: (JBMESSAGING-864) Memory leak when using JCA layer and creating consumer on each send

[Tim Fox (JIRA)]

Memory leak when using JCA layer and creating consumer on each send
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                 Key: JBMESSAGING-864
                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-864
             Project: JBoss Messaging
          Issue Type: Bug
    Affects Versions: 1.0.1.SP4
            Reporter: Tim Fox
         Assigned To: Tim Fox


If using the JCA adapter and performing the following anti-pattern:

create connection
create session
create consumer
message = consumer.receive(..)

in order to recieve a single message (this is what the spring jms template apparently does - yikes)

Then the JCA layer will cache the connection and session, but the consumer will get created anew on the server each time. This in itself means the operation will be very slow - hence I consider this an antipattern.

Since the JCA layer re-uses the session, it never gets closed. In the 1_0 branch deliveries are maintained in the consumer, not the session, so consumer.close() does not actually close the consumers - this happens on session.close(). Hence the leak.

This does not affect the 1.2 branch where deliveries are stored on the session level.

My recommendation to people would be not to use this antipattern in the first place. This may mean not using the Spring jms template which unfortunatelt seems to be poorly coded to work this way.

Also see
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4019590#4019590
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=102169

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