Threads parked waiting for EJB instance causing slowness in application in EAP 6
Issue
Lot of threads found in TIMED_WAIT parked state waiting for EJB instance to get free. Below is observed in thread stack trace from thread dumps:
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000007026c4098> (a java.util.concurrent.Semaphore$FairSync)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1011)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1303)
at java.util.concurrent.Semaphore.tryAcquire(Semaphore.java:383)
at org.jboss.as.ejb3.pool.strictmax.StrictMaxPool.get(StrictMaxPool.java:107)
at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:47)
Environment
Red Hat Enterprise Application Platform (EAP) 6.x
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