[jboss-jira] [JBoss JIRA] Created: (JBAS-8124) Memory Leak in JBossMQ with 2PC QueueSessions

Wed Jun 23 06:48:44 EDT 2010

Memory Leak in JBossMQ with 2PC QueueSessions
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                 Key: JBAS-8124
                 URL: https://jira.jboss.org/browse/JBAS-8124
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: JMS (JBossMQ)
    Affects Versions: JBossAS-4.2.3.GA
            Reporter: Rico Neubauer
            Assignee: Adrian Brock

JBossMQ has a memory leak, which has the same symptoms as reported for JBoss Messaging in https://jira.jboss.org/browse/JBMESSAGING-638 and discussed in http://community.jboss.org/thread/128250.

Problem is that when using a transacted QueueSession, when closing QueueSession#close invokes QueueSession#internalRollback to clean-up any unacknowledged messages, but also starts a new transaction, which is added to QueueConnection's SpyXAResourceProvider.
Since this transaction is never committed or rolled-back, it stays for the lifetime of the QueueConnection, which can be like forever when cacheing the QueueConnection. Also see "Steps to Reproduce"
Will attach MAT screenshot.

This occurs in JBossMQ of 4.2.3, but also 4.0.5 (and probably all 4.x)
I am aware of the EOL of JBoss 4.x, but will attach a proposed patch anyways.

Possible workarounds:
- Do not use transacted QueueSessions
- Close and nullify the QueueConnection from time to time to let GC clean-up the leaked objects

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