java.lang.IllegalMonitorStateException in CacheMap.writeUnlock()
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Key: OPENJPA-1467
URL: https://issues.apache.org/jira/browse/OPENJPA-1467
Project: OpenJPA
Issue Type: Bug
Components: datacache
Affects Versions: 2.0.0-M3, 2.0.0-M2, 2.0.0-M1, 2.0.0-M4, 2.0.0
Reporter: Rick Curtis
Assignee: Rick Curtis
I encountered the following exception when doing some load testing:
Caused by: java.lang.IllegalMonitorStateException
at
java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:139)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1187)
at
java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:443)
at org.apache.openjpa.util.CacheMap.writeUnlock(CacheMap.java:203)
at
org.apache.openjpa.datacache.ConcurrentDataCache.writeUnlock(ConcurrentDataCache.java:108)
at
org.apache.openjpa.datacache.DataCacheStoreManager.cacheStateManager(DataCacheStoreManager.java:382)
at
org.apache.openjpa.datacache.DataCacheStoreManager.initialize(DataCacheStoreManager.java:353)
at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
at org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:998)
at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:956)
... 43 more
At first glance it seemed impossible that this exception was happening...
Everywhere that CacheMap.writeUnlock() is called there is a corresponding
CacheMap.writeLock() prior to that call.
I discovered that the bug is in
org.apache.openjpa.datacache.ConcurrentDataCache.removeAllInternal(Class<?>
cls, boolean subs). The problem is that this method modifies the underlying
cache, but doesn't obtain a writeLock first.
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