[jboss-user] [Messaging, JMS & JBossMQ] - Re: Recover Exception after Rollback in JMS

[tpollak.ar]

Hello Elias,

Thanks for your answer. I had considered some similar approaches like the one you propose.

However, if I include a non-transactional component in the design, there is the possibility to introduce a race condition.

Imagine this scenario:
1) The JMS message is delivered for the first time, and starts transaction T1 to process Object A.
2) During the process, a business error is detected and an exception with the message is thrown.
3) As this exception is thrown, somewhere a handler sends also a non-transacitonal message to the process queue.
4) The JMS message is redelivered in T2, and the MDB has to flag this process as failed (and maybe update Object A to a new state?).
5) At the same time, the second message is processed in T3, that has to update Object A to attach the error message to it.

In this hypothetical case, it would be very unlikely that this race condition materializes to a real threat, because we would take care that T2 and T3 will not update the same objects. However, this is not valid for a more general case. Maybe if I don't find a better solution I will have to settle for this.

Regards,
Tomas

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