why is activeMQ stalled?

[David Delbecq]

Hello, can someone explain me why my activeMQ client is stalled in such situation (i have 10 threads blocked like this having as consequence a complete blocking of my client application): "http-8081-Processor6" daemon prio=10 tid=00841c38 nid=512 lwp_id=2426611 waiting on condition [236f3000..236f153c]    java.lang.Thread.State: WAITING (parking)         at sun.misc.Unsafe.park(Native Method)         - parking to wait for  <40ae1828> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)         at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1889)         at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:317)         at org.apache.activemq.transport.FutureResponse.getResult(FutureResponse.java:40)         at org.apache.activemq.transport.ResponseCorrelator.request(ResponseCorrelator.java:80)         at org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1233)         at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1659)         - locked <40ae01e8> (a java.lang.Object)         at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:227)         at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:241)         at be.rmi.shark.JMSEventManager.sendEvent(JMSEventManager.java:146) considering that the activeMQ lists size, as referenced by activeMQ admin interface are as follow: Name   Number Of Pending Messages   Number Of Consumers   Messages Sent   Messages Received   Views   Operations   WF.Regraph 0 1 1714 1720 Browse Send To Purge Delete WF.Notify 0 1 1696 1742 Browse Send To Purge Delete WF.IncomingEvents 0 0 0 0 Browse Send To Purge Delete Is this to be considered normal that i must restart activeMQ producers on a regular basis because of those this stalling? Where can i find clear documentation on proper configuration of activeMQ to prevent this stalling? Thank you. -- David Delbecq ICT Institut Royal Météorologique Ext:557