java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync: This exception has no message.

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java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync:
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:964)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)
at org.drools.common.UpgradableReentrantReadWriteLock.readLock(UpgradableReentrantReadWriteLock.java:48)
at org.drools.common.AbstractRuleBase.readLock(AbstractRuleBase.java:500)
at org.drools.impl.StatelessKnowledgeSessionImpl.newWorkingMemory(StatelessKnowledgeSessionImpl.java:124)
at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:335)

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