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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-3022) NPE on logout in XASessionImpl
Date Thu, 14 Jul 2011 12:52:59 GMT

    [ https://issues.apache.org/jira/browse/JCR-3022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065224#comment-13065224

Stefan Guggisberg commented on JCR-3022:

logout is obviously called from the finalize method. this indicates that the session 
hasn't been closed explicitly by the application. you should therefore see debug log 
msgs like this:

"Unclosed session detected. The session was opened here: [stacktrace...]"

however, i can't explain how the versionMgr field could possibly be null. 
versionMgr is declared as 'final' and is instantiated in the SessionImpl constructor.
it can't be set to null because it's final.

please provide detailed information about your environment/deployment.

is this issue reproducible with a simple test case?

> NPE on logout in XASessionImpl
> ------------------------------
>                 Key: JCR-3022
>                 URL: https://issues.apache.org/jira/browse/JCR-3022
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 2.1.1, 2.1.2, 2.1.3, 2.1.5, 2.2.7
>            Reporter: Carl Hall
> Found this in our logs when shutting down Sling. Not seen very frequently though. Seems
like a null check before calling ((InternalXAVersionManager) versionMgr).close() would clear
the message but maybe this null needs to be logged.
> v2.2 = org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:392)
> v2.1 = org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:413) 
> 08.06.2011 14:01:28.484 *WARN* [Finalizer] org.apache.jackrabbit.core.XASessionImpl error
while closing InternalXAVersionManager java.lang.NullPointerException 
>         at org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:413) 
>         at org.apache.jackrabbit.core.SessionImpl.finalize(SessionImpl.java:1680) 
>         at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method) 
>         at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83) 
>         at java.lang.ref.Finalizer.access$100(Finalizer.java:14) 
>         at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160) 

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