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https://issues.apache.org/jira/browse/JCR-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12552436
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Marcel Reutegger commented on JCR-1148:
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I'm able to reproduce this issue with the test case
ConcurrentyTest.testConcurrentWritingSessions() and FineGrainedISMLocking.
> NullPointerException in ItemState
> ---------------------------------
>
> Key: JCR-1148
> URL: https://issues.apache.org/jira/browse/JCR-1148
> Project: Jackrabbit
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 1.3, 1.3.1, 1.3.3
> Reporter: Martijn Hendriks
> Fix For: 1.4
>
>
> The following happens quite regularly when multiple threads are adding,
> retrieving and removing nodes simultaneously. Looking at the code of the pull
> method, this seems due to under-synchronization somewhere as overlayedState
> was tested at line 153 for null.
> java.lang.NullPointerException
> at org.apache.jackrabbit.core.state.ItemState.pull(ItemState.java:156)
> at
> org.apache.jackrabbit.core.state.LocalItemStateManager.stateModified(LocalItemStateManager.java:421)
> at
> org.apache.jackrabbit.core.state.StateChangeDispatcher.notifyStateModified(StateChangeDispatcher.java:85)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager.stateModified(SharedItemStateManager.java:434)
> at
> org.apache.jackrabbit.core.state.ItemState.notifyStateUpdated(ItemState.java:241)
> at
> org.apache.jackrabbit.core.state.ChangeLog.persisted(ChangeLog.java:271)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager$Update.end(SharedItemStateManager.java:741)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:937)
> at
> org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:327)
> at
> org.apache.jackrabbit.core.state.XAItemStateManager.update(XAItemStateManager.java:313)
> at
> org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:303)
> at
> org.apache.jackrabbit.core.state.SessionItemStateManager.update(SessionItemStateManager.java:307)
> at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:1374)
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