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


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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