Blocking jms access after sudden death of openjms server

Unter certain circumstances I experience a very strange behaviour of our openjms application.

A JMS-Server and at least two clients are running on the same WinXP-PC and are exchanging regularely 
a few messages per second (All openjms 0.7.6.1, using TcpConfiguration and Topics).

If I kill the jms server process deliberately or deactivate the network connection I experience very 
often that one or more active threads hang at the following method (Stacktrace from Eclipse, where 
the problem can be reproduced, sometimes):

Thread [AN1] (Suspended)
	owns: ObjectChannel  (id=104)
	owns: JmsTopicSession  (id=123)	
	waiting for: LinkedList  (id=122)
	Object.wait(long) line: not available [native method]
	LinkedList(Object).wait() line: 429
	Queue.remove() line: 93
	QueueInputStream.receive() line: 93
	ObjectChannel.receive() line: 141
	IpcJmsSessionStub.checkReply(String) line: 841
	IpcJmsSessionStub.createSubscriber(JmsTopic, String, long, String, boolean) line: 451
	JmsTopicSession.addSubscriber(JmsTopicSubscriber, String) line: 313
	JmsTopicSession.createSubscriber(Topic, String, boolean) line: 160
	JmsTopicSession.createSubscriber(Topic) line: 123
	JMSManager.sendQuestion(Object, Topic, Topic, String, Serializable, long) line: 393
	JMSManager.sendQuestion(Object, Topic, Topic, String, Serializable) line: 734
	SystemProxy.executeMethodWithRet(Serializable[]) line: 462
	SystemProxy.checkAlive() line: 521
	SystemProxy.workAtIdle() line: 669
	SystemProxy(MyThread).run() line: 631


It seems that no other thread feels responsible to call notifyAll() to get out of the wait(). 
Unfortunately, the classes ObjectChannel, QueueInputStream and Queue are part of 
exolabcore-0.3.7.jar that is not available as source code, so my debugging possibilities are very 
limited.

Question: Which thread ist responsible for waking up the waiting "Queue" and why does it not happen? 
Shurely there is a kind of timeout in the helper thread when the tcp connection is broken? There 
seem to be several helper threads on the client side (EventManagerThread, Multiplexer-xx, 
MessageCopier-0) but I am not able to evaluate the right one.

Any help would be appreciated,

Andreas Schiefke
email: [email protected]



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