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

[Brian Stansberry (JIRA)]

LRUEnterpriseContextCachePolicy leaks classloader to Timer thread
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                 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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