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https://issues.apache.org/jira/browse/JCR-3065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13097853#comment-13097853
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Marcel Reutegger commented on JCR-3065:
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> [...] multiple threads running inside the same transaction.
I also noticed that this could be a potential problem, but in this case there
is no transaction wrapped around the save call.
> ConcurrentModificationException in FineGrainedISMLocking
> --------------------------------------------------------
>
> Key: JCR-3065
> URL: https://issues.apache.org/jira/browse/JCR-3065
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 2.2.0
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Priority: Minor
> Fix For: 2.3.0
>
> Attachments: JCR-3065.patch
>
>
> We have a report where the FineGrainedISMLocking throws a
> ConcurrentModificationException (stacktrace
> from a Jackrabbit 2.2.x):
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:828)
> at
> org.apache.jackrabbit.core.state.FineGrainedISMLocking$LockMap.hasDependency(FineGrainedISMLocking.java:388)
> at
> org.apache.jackrabbit.core.state.FineGrainedISMLocking.acquireWriteLock(FineGrainedISMLocking.java:138)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager.acquireWriteLock(SharedItemStateManager.java:1848)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager.access$200(SharedItemStateManager.java:113)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager$Update.begin(SharedItemStateManager.java:563)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager.beginUpdate(SharedItemStateManager.java:1457)
> at
> org.apache.jackrabbit.core.state.SharedItemStateManager.update(SharedItemStateManager.java:1487)
> at
> org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:351)
> at
> org.apache.jackrabbit.core.state.XAItemStateManager.update(XAItemStateManager.java:354)
> at
> org.apache.jackrabbit.core.state.LocalItemStateManager.update(LocalItemStateManager.java:326)
> at
> org.apache.jackrabbit.core.state.SessionItemStateManager.update(SessionItemStateManager.java:289)
> at
> org.apache.jackrabbit.core.ItemSaveOperation.perform(ItemSaveOperation.java:258)
> at
> org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
> at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
> at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:329)
> at
> org.apache.jackrabbit.core.session.SessionSaveOperation.perform(SessionSaveOperation.java:42)
> at
> org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:200)
> at org.apache.jackrabbit.core.SessionImpl.perform(SessionImpl.java:355)
> at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:758)
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