[jboss-jira] [JBoss JIRA] Closed: (JBAS-5375) LRUEnterpriseContextCachePolicy leaks classloader to Timer thread

[Brian Stansberry (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBAS-5375?page=all ]

Brian Stansberry closed JBAS-5375.
----------------------------------

    Resolution: Done

> LRUEnterpriseContextCachePolicy leaks classloader to Timer thread
> -----------------------------------------------------------------
>
>                 Key: JBAS-5375
>                 URL: http://jira.jboss.com/jira/browse/JBAS-5375
>             Project: JBoss Application Server
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: EJB2
>    Affects Versions: JBossAS-5.0.0.Beta4
>            Reporter: Brian Stansberry
>         Assigned To: Brian Stansberry
>            Priority: Minor
>             Fix For: JBossAS-5.0.0.CR1
>
>
> When LRUEnterpriseContextCachePolicy loads, it creates a static ref to Timer, which creates a Thread. A newly created thread inherits its TCCL from whatever thread created it, so whatever deployment classloader is the TCCL when LRUEnterpriseContextCachePolicy is loaded, that classloader get leaked to the timer thread.
> This is the cause of the failure of ClassloaderLeakUnitTestCase.testSimpleEjb().
> JBoss Profiler heap analysis shows the path to the static Timer ref:
> !--BaseClassLoader at d279e2{vfsfile:/C:/dev/jboss/jboss-head/testsuite/output/lib/classloader-leak-ejb.jar}
> !--!--FieldReference private java.lang.ClassLoader java.lang.Thread.contextClassLoader=Thread[Timer-2,5,RMI Runtime]
> !--!--!--FieldReference private java.util.TimerThread java.util.Timer.thread=java.util.Timer at 5a9fcd
> !--!--!--!--StaticFieldReference protected static java.util.Timer org.jboss.ejb.plugins.LRUEnterpriseContextCachePolicy.tasksTimer 
> A fix is to set the TCCL to LRUEnterpriseContextCachePolicy.class.getClassLoader() before creating the timer, and then restoring it.

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