This is the deadlock: ReceiverAspect.handleReceive is trying to communicate back to the server, and the aspect is holding its communication (as it's supposed to do), while handleFailoverOnConsumer is trying to change MessageCallbackHandler properties. "LocalThreadConsumer-1" prio=1 tid=0x8b9cf568 nid=0x228e in Object.wait() [0x8a66f000..0x8a66feb0] | at java.lang.Object.wait(Native Method) | - waiting on <0x91652838> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock) | at java.lang.Object.wait(Object.java:474) | at EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock.acquire(WriterPreferenceReadWriteLock.java:240) | - locked <0x91652838> (a EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock$WriterLock) | at org.jboss.jms.client.container.ValveAspect.invoke(ValveAspect.java:107) | at org.jboss.jms.client.delegate.ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.invokeNext(ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.java) | at org.jboss.jms.client.container.ClosedInterceptor.invoke(ClosedInterceptor.java:177) | at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:117) | at org.jboss.jms.client.delegate.ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.invokeNext(ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.java) | at org.jboss.jms.client.container.ExceptionInterceptor.invoke(ExceptionInterceptor.java:68) | at org.jboss.jms.client.delegate.ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.invokeNext(ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.java) | at org.jboss.jms.client.container.ClientLogInterceptor.invoke(ClientLogInterceptor.java:107) | at org.jboss.jms.client.delegate.ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.invokeNext(ClientSessionDelegate$acknowledgeDelivery_N3172014476730533936.java) | at org.jboss.jms.client.delegate.ClientSessionDelegate.acknowledgeDelivery(ClientSessionDelegate.java) | at org.jboss.jms.client.container.SessionAspect.ackDelivery(SessionAspect.java:453) | at org.jboss.jms.client.container.SessionAspect.handlePostDeliver(SessionAspect.java:283) | at org.jboss.aop.advice.org.jboss.jms.client.container.SessionAspect7.invoke(SessionAspect7.java) | at org.jboss.jms.client.delegate.ClientSessionDelegate$postDeliver_5319211143798977162.invokeNext(ClientSessionDelegate$postDeliver_5319211143798977162.java) | at org.jboss.jms.client.container.ClosedInterceptor.invoke(ClosedInterceptor.java:177) | at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:117) | at org.jboss.jms.client.delegate.ClientSessionDelegate$postDeliver_5319211143798977162.invokeNext(ClientSessionDelegate$postDeliver_5319211143798977162.java) | at org.jboss.jms.client.container.ExceptionInterceptor.invoke(ExceptionInterceptor.java:68) | at org.jboss.jms.client.delegate.ClientSessionDelegate$postDeliver_5319211143798977162.invokeNext(ClientSessionDelegate$postDeliver_5319211143798977162.java) | at org.jboss.jms.client.container.ClientLogInterceptor.invoke(ClientLogInterceptor.java:107) | at org.jboss.jms.client.delegate.ClientSessionDelegate$postDeliver_5319211143798977162.invokeNext(ClientSessionDelegate$postDeliver_5319211143798977162.java) | at org.jboss.jms.client.delegate.ClientSessionDelegate.postDeliver(ClientSessionDelegate.java) | at org.jboss.jms.client.remoting.MessageCallbackHandler.receive(MessageCallbackHandler.java:419) | - locked <0x91652338> (a java.lang.Object) | at org.jboss.jms.client.container.ReceiverAspect.handleReceive(ReceiverAspect.java:63) | at org.jboss.aop.advice.org.jboss.jms.client.container.ReceiverAspect25.invoke(ReceiverAspect25.java) | at org.jboss.jms.client.delegate.ClientConsumerDelegate$receive_N8299950230150603585.invokeNext(ClientConsumerDelegate$receive_N8299950230150603585.java) | at org.jboss.jms.client.container.ClosedInterceptor.invoke(ClosedInterceptor.java:177) | at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:117) | at org.jboss.jms.client.delegate.ClientConsumerDelegate$receive_N8299950230150603585.invokeNext(ClientConsumerDelegate$receive_N8299950230150603585.java) | at org.jboss.jms.client.container.ExceptionInterceptor.invoke(ExceptionInterceptor.java:68) | at org.jboss.jms.client.delegate.ClientConsumerDelegate$receive_N8299950230150603585.invokeNext(ClientConsumerDelegate$receive_N8299950230150603585.java) | at org.jboss.jms.client.container.ClientLogInterceptor.invoke(ClientLogInterceptor.java:107) | at org.jboss.jms.client.delegate.ClientConsumerDelegate$receive_N8299950230150603585.invokeNext(ClientConsumerDelegate$receive_N8299950230150603585.java) | at org.jboss.jms.client.delegate.ClientConsumerDelegate.receive(ClientConsumerDelegate.java) | at org.jboss.jms.client.JBossMessageConsumer.receive(JBossMessageConsumer.java:86) | at org.jboss.test.messaging.jms.clustering.ValveTest$LocalThreadConsumer.run(ValveTest.java:94) | | | "Thread-6" daemon prio=1 tid=0x08183840 nid=0x22d2 waiting for monitor entry [0x8aefc000..0x8aefd030] | at org.jboss.jms.client.remoting.MessageCallbackHandler.copyState(MessageCallbackHandler.java:500) | - waiting to lock <0x91652338> (a java.lang.Object) | at org.jboss.jms.client.container.HAAspect.handleFailoverOnConsumer(HAAspect.java:605) | at org.jboss.jms.client.container.HAAspect.performClientSideFailover(HAAspect.java:451) | at org.jboss.jms.client.container.HAAspect.handleConnectionFailure(HAAspect.java:337) | at org.jboss.jms.client.container.ValveAspect.handleConnectionFailure(ValveAspect.java:202) | at org.jboss.jms.client.container.ValveAspect$ConnectionFailureListener.handleConnectionException(ValveAspect.java:241) | at org.jboss.jms.client.remoting.ConsolidatedRemotingConnectionListener.handleConnectionException(ConsolidatedRemotingConnectionListener.java:83) | at org.jboss.remoting.ConnectionValidator$1.run(ConnectionValidator.java:139) | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996294#... 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