Bugs item #879821, was opened at 2004-01-19 16:52
Message generated for change (Comment added) made by esriram
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Category: JBossMQ
Group: v3.2
Status: Open
Resolution: None
Priority: 5
Submitted By: E.Sriram (esriram)
Assigned to: Nobody/Anonymous (nobody)
Summary: SpyMessageConsumer.close() never returns
Initial Comment:
The close() method of SpyMessageConsumer never returns.
Thread dump shows that the close() method got stuck on
a Thread.join().
Thread dump attached.
Close Thread:
"Thread-0" prio=1 tid=0x0a3c3e68 nid=0x8bc in
Object.wait() [41bcc000..41bcd298]
at java.lang.Object.wait(Native Method)
- waiting on <0x4971d260> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1001)
- locked <0x4971d260> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1054)
at
org.jboss.mq.SpyMessageConsumer.close(SpyMessageConsumer.java:409)
at
com.adventnet.tree.notification.TreeViewNotificationHandler.cleanup(TreeViewNotificationHandler.java:81)
...
...
...
The close() method is waiting for a MessageListener
thread which is on an Object.wait().
MessageListenerThread:
"MessageListenerThread - TreeNotificationTopic" prio=1
tid=0x08711490 nid=0x8bc in Object.wait()
[607b4000..607b5098]
at java.lang.Object.wait(Native Method)
- waiting on <0x4971d2a8> (a java.util.LinkedList)
at java.lang.Object.wait(Object.java:429)
at
org.jboss.mq.SpyMessageConsumer.run(SpyMessageConsumer.java:495)
- locked <0x4971d2a8> (a java.util.LinkedList)
at java.lang.Thread.run(Thread.java:534)
The root cause is a threading issue between the threads
mentioned above.
The fix would be to move the listenerThread.join()
inside a synchronized block on messages.
--E.Sriram
----------------------------------------------------------------------
>Comment By: E.Sriram (esriram)
Date: 2004-01-19 17:34
Message:
Logged In: YES
user_id=694460
The fix I suggested (i.e) moving the Thread.join inside a
synchronized block on messages will not work.
Some other fix should be identified.
--E.Sriram
----------------------------------------------------------------------
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