[JCR-1271] NullPointerException when iterating over properties

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.3.4, 1.4
• Component/s: jackrabbit-core
• Assignee: Unassigned
• Reporter: Marcel Reutegger
• Created: 14/Dec/07 13:32
• Updated: 26/Mar/08 12:02
• Resolved: 19/Dec/07 10:50

Description

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.