Issue

• Java threads are blocked waiting for a lock that is not held by any threads ie. a lock that has already been released.
• server.log entries similar to

http-/0.0.0.0:8080-12" daemon prio=10 tid=0x00007f5f0403f800 nid=0x1739 waiting on condition [0x00007f5efd157000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000006e4c568f8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)
    at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
    at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
    at org.hibernate.internal.util.collections.BoundedConcurrentHashMap$Segment.attemptEviction(BoundedConcurrentHashMap.java:1576)
    at org.hibernate.internal.util.collections.BoundedConcurrentHashMap$Segment.get(BoundedConcurrentHashMap.java:1299)
    at org.hibernate.internal.util.collections.BoundedConcurrentHashMap.get(BoundedConcurrentHashMap.java:1860)
    at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:165)
    at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:219)
    at org.hibernate.internal.AbstractSessionImpl.getNamedQuery(AbstractSessionImpl.java:138)
    at org.hibernate.internal.SessionImpl.getNamedQuery(SessionImpl.java:1344)
    at org.hibernate.ejb.AbstractEntityManagerImpl.createNamedQuery(AbstractEntityManagerImpl.java:613)
    at org.jboss.as.jpa.container.AbstractEntityManager.createNamedQuery(AbstractEntityManager.java:79)
    at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
    at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
    at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:263)
    at org.jboss.weld.bean.builtin.CallableMethodHandler.invoke(CallableMethodHandler.java:52)
    at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56)
    at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:105)