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POHow can I work around this apparent EhCache deadlock?
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  1. POHow can I work around this apparent EhCache deadlock?
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    copied!<p>Using ehCache 2.4.4, I seem to have gotten into a deadlock on the ehCache Segment object. From other logging, I know that the 'waiting thread', 1694 last ran anything 9 hours before this stack trace was generated. In the meantime, 1696 has gone and done a lot of other work, so this lock is definitely being held errantly.</p> <p>I'm pretty confident that I am not directly locking any Segment instances directly, so I assume this is some kind of issue internal to the library. Any ideas?</p> <pre><code>"Model Executor - 1696" Id=1696 in TIMED_WAITING on lock=java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@92eb1ed at sun.misc.Unsafe.park(Native Method) at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source) at java.util.concurrent.PriorityBlockingQueue.poll(Unknown Source) at com.rtrms.application.modeling.local.BlockingTaskList.takeTask(BlockingTaskList.java:20) at com.rtrms.application.modeling.local.ModelExecutor.executeNextTask(ModelExecutor.java:71) at com.rtrms.application.modeling.local.ModelExecutor.run(ModelExecutor.java:46) Locked synchronizers: count = 1 - java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@4a3d767f "Model Executor - 1694" Id=1694 in WAITING on lock=java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync@4a3d767f owned by Model Executor - 1696 Id=1696 at sun.misc.Unsafe.park(Native Method) at java.util.concurrent.locks.LockSupport.park(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(Unknown Source) at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(Unknown Source) at net.sf.ehcache.store.compound.Segment.unretrievedGet(Segment.java:248) at net.sf.ehcache.store.compound.CompoundStore.unretrievedGet(CompoundStore.java:191) at net.sf.ehcache.store.compound.impl.DiskPersistentStore.containsKeyInMemory(DiskPersistentStore.java:72) at net.sf.ehcache.Cache.searchInStoreWithStats(Cache.java:1884) at net.sf.ehcache.Cache.get(Cache.java:1549) at com.rtrms.amoeba.cache.DistributedModeledSecurities.get(DistributedModeledSecurities.java:57) at com.rtrms.amoeba.modeling.AssertPersistedModeledSecurities.get(AssertPersistedModeledSecurities.java:44) at com.rtrms.application.modeling.tasks.ExpandableModelingTask.getNextUnexecutedTask(ExpandableModelingTask.java:35) at com.rtrms.application.modeling.local.BlockingTaskList.takeTask(BlockingTaskList.java:36) at com.rtrms.application.modeling.local.ModelExecutor.executeNextTask(ModelExecutor.java:71) at com.rtrms.application.modeling.local.ModelExecutor.run(ModelExecutor.java:46) Locked synchronizers: count = 0 </code></pre>
 

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