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https://issues.apache.org/jira/browse/JCR-1271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12552718
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Jukka Zitting commented on JCR-1271:
------------------------------------
Could we not fix the problem at its source instead of in a synchronization
wrapper? I'd just synchronize the methods in ItemStateReferenceCache.
> NullPointerException when iterating over properties
> ---------------------------------------------------
>
> Key: JCR-1271
> URL: https://issues.apache.org/jira/browse/JCR-1271
> Project: Jackrabbit
> Issue Type: Bug
> Components: jackrabbit-core
> Reporter: Marcel Reutegger
> Priority: Minor
> Attachments: JCR-1271.patch, JCR-1271.patch
>
>
> Running ConcurrentReadWriteTest (NUM_NODES=5, NUM_THREADS=3,
> RUN_NUM_SECONDS=120) resulted in a NullPointerException:
> Exception in thread "Thread-11" java.lang.NullPointerException
> at
> org.apache.commons.collections.map.AbstractReferenceMap$ReferenceEntry.getValue(AbstractReferenceMap.java:596)
> at
> org.apache.commons.collections.map.AbstractReferenceMap.containsKey(AbstractReferenceMap.java:204)
> at
> org.apache.jackrabbit.core.state.ItemStateMap.contains(ItemStateMap.java:66)
> at
> org.apache.jackrabbit.core.state.ItemStateReferenceCache.isCached(ItemStateReferenceCache.java:91)
> at
> org.apache.jackrabbit.core.state.LocalItemStateManager.hasItemState(LocalItemStateManager.java:173)
> at
> org.apache.jackrabbit.core.state.XAItemStateManager.hasItemState(XAItemStateManager.java:252)
> at
> org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:174)
> at
> org.apache.jackrabbit.core.ItemManager.createItemInstance(ItemManager.java:495)
> at org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:326)
> at
> org.apache.jackrabbit.core.LazyItemIterator.prefetchNext(LazyItemIterator.java:90)
> at
> org.apache.jackrabbit.core.LazyItemIterator.next(LazyItemIterator.java:203)
> at
> org.apache.jackrabbit.core.LazyItemIterator.nextProperty(LazyItemIterator.java:118)
> at
> org.apache.jackrabbit.core.ConcurrentReadWriteTest$1$1.execute(ConcurrentReadWriteTest.java:64)
> at
> org.apache.jackrabbit.core.AbstractConcurrencyTest$Executor.run(AbstractConcurrencyTest.java:110)
> at java.lang.Thread.run(Thread.java:619)
> The cache is not synchronized and is accessed at the same time by the current
> thread and another thread that notified ItemStates about changes.
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