After struggling for a few days with asynchronous continuations with the following
configuration:
Weblogic 10.3
jBPM 3.3.1.GA
we could finally make them work.
Although we followed configuration instructions from the manual thoroughly, things
didn't work as expected. The most weird thing was that the very same configuration
worked fine in JBoss 4.2.3.GA. We finally detected that the problem was that the messages
sent to JobListenerBean were not being commited. The reason for this is that JBoss and
Weblogic handle Non-transacted JMS sessions within a JTA transaction just in the opposite
way.
For details please read:
Weblogic
http://e-docs.bea.com/wls/docs103/jms/trans.html#wp1025537
and
JBoss
http://www.odi.ch/prog/jms-tx.php
Unfortunately the kind of session (transacted vs. non-transacted) that jBPM uses is not
configurable: it is hardcoded in JmsMessageService.java
| /*
| * If the connection supports XA, the session will always take part in the global
transaction.
| * Otherwise the first parameter specifies whether message productions and
consumptions
| * are part of a single transaction (TRUE) or performed immediately (FALSE).
| * Messages are never meant to be received before the database transaction
commits,
| * hence the transacted is preferable.
| */
| session = connection.createSession(true, Session.SESSION_TRANSACTED);
|
so we had to change that line to:
| session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE) ;
|
Let me emphasize that the change in the first parameter value (true -> false) is NOT
meant to achieve different behaviors in both application servers. It's just that they
both interpret it in the opposite way. (If you don't trust me read the above links :-)
)
Hope that this can save other people's time ;-)
BTW: I don't know if future releases of jBPM are going to deal with asynchronous
continuations in the same way, but if they are, it could be good idea to make this
behavior configurable.
Best regards,
Claudio
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