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https://issues.apache.org/jira/browse/JCR-3246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418346#comment-13418346
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Nick Tuckett commented on JCR-3246:
-----------------------------------
FWIW I can reproduce this, but in a non-critical situation and without any
custom code. I haven't gone out of my way to do this; I came across these kind
of log warnings when adding some user management functionality to my
application.
With a TransientRepository, log in with an admin session to set up the
repository, then acquire the UserManager for that session - this will create a
parallel session for the security workspace, referenced by the underlying
UserManagerImpl instance. Also, the UserManagerImpl will be added as a
SessionListener to the original admin session.
Then with no other sessions active, log the admin session out - this will
ultimately iterate through its SessionListeners, calling loggedOut() on each.
One such callback will be to the TransientRepository, which will trigger the
shutdown (itself logging out any remaining active sessions). Another callback
will be to the UserManagerImpl, which will attempt to log out its security
session.
It would appear that the order of these callbacks isn't guaranteed, as it can
change from run to run. If the TransientRepository callback happens first, it
will log out the user manager security session - then the UserManagerImpl
callback will occur, attempting to log that session out again, producing the
kind of warning log messages described above.
> RepositoryImpl attempts to close active session twice on shutdown
> -----------------------------------------------------------------
>
> Key: JCR-3246
> URL: https://issues.apache.org/jira/browse/JCR-3246
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 2.4
> Reporter: Jan Haderka
> Priority: Critical
>
> On shutdown sessions are being closed twice which lead to the exception being
> logged as shown below. As far as I can tell {{RepositoryImpl}} has system
> sessions in the list of active sessions which is why it tries to close them
> twice - first time when closing all active sessions
> {{(RepositoryImpl.java:1078)}} and second time when disposing workspace
> {{(RepositoryImpl.java:1090)}}.
> {noformat}
> 2012-02-28 10:36:00,614 WARN org.apache.jackrabbit.core.session.SessionState
> : Attempt to close session-31 after it has already been closed. Please
> review your code for proper session management.
> java.lang.Exception: Stack trace of the duplicate attempt to close session-31
> at
> org.apache.jackrabbit.core.session.SessionState.close(SessionState.java:280)
> at org.apache.jackrabbit.core.SessionImpl.logout(SessionImpl.java:943)
> at
> org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:392)
> at
> org.apache.jackrabbit.core.security.user.UserManagerImpl.loggedOut(UserManagerImpl.java:1115)
> at
> org.apache.jackrabbit.core.SessionImpl.notifyLoggedOut(SessionImpl.java:565)
> at org.apache.jackrabbit.core.SessionImpl.logout(SessionImpl.java:979)
> at
> org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.doDispose(RepositoryImpl.java:2200)
> at
> org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.dispose(RepositoryImpl.java:2154)
> at
> org.apache.jackrabbit.core.RepositoryImpl.doShutdown(RepositoryImpl.java:1090)
> at
> org.apache.jackrabbit.core.RepositoryImpl.shutdown(RepositoryImpl.java:1041)
> at
> org.apache.jackrabbit.core.jndi.BindableRepository.shutdown(BindableRepository.java:259)
> at
> org.apache.jackrabbit.core.jndi.RegistryHelper.unregisterRepository(RegistryHelper.java:94)
> ...
> 2012-02-28 10:36:00,617 WARN org.apache.jackrabbit.core.session.SessionState
> : session-31 has already been closed. See the attached exception for a
> trace of where this session was closed.
> java.lang.Exception: Stack trace of where session-31 was originally closed
> at
> org.apache.jackrabbit.core.session.SessionState.close(SessionState.java:275)
> at org.apache.jackrabbit.core.SessionImpl.logout(SessionImpl.java:943)
> at
> org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:392)
> at
> org.apache.jackrabbit.core.RepositoryImpl.doShutdown(RepositoryImpl.java:1078)
> at
> org.apache.jackrabbit.core.RepositoryImpl.shutdown(RepositoryImpl.java:1041)
> at
> org.apache.jackrabbit.core.jndi.BindableRepository.shutdown(BindableRepository.java:259)
> at
> org.apache.jackrabbit.core.jndi.RegistryHelper.unregisterRepository(RegistryHelper.java:94)
> ...
> {noformat}
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