message ordering wrong 4.2.0

[justkeys]

We use an mdb to process messages from a queue. If the messaages arrive fast in the queue, they are delivered in reverse order sometimes.

Do we have to specify that order is important somehow, when declaring the queue?

On the wiki http://wiki.jboss.org/wiki/Wiki.jsp?page=JMSPriority it says that they should be delivered in order, if messages are sent from the same session. We send messages from one single session, but the session is created in a different thread than the thread that sends the messages. Could that cause the ordering to break?

[justkeys]

The actual problem is that there are 2 instances of my MDB working. They may get the messages out in the right order, but then these threads get scheduled in such way that the processing order is no longer like the queue order.

[justkeys]

http://wiki.jboss.org/wiki/Wiki.jsp?page=HowDoIGetAnMDBSingleton

@ActivationConfigProperty(propertyName = "maxSession", propertyValue = "1")