I have a MDB that listen on a queue. MDB is in charge to perform a time 
consuming tasks. It invokes another EJB session.

I have two problems:
- MDB is transaction required. My task exceed the default timeout. How can I 
configure by XML the timeout for the MDB ? I have try to add some stuff in 
jboss.xml, nut it looks to be ignored.

- Task is long, so MDB does not commit quick enough and the message is 
redelivered. I'd like to acknowledge the message at the beginning of my MDB as 
soon as I know that I will be able to process the message. I try 
message.acknowledge(). it looks to be ignored. Message is acknowlege only when 
onMessage method returns. Is it possible to programmatically acknowledge a 
message before MDB return ?

I have tried to move to a bean managed transaction. I start my own transaction 
and set the timeout on a UserTransaction. That's not a good solution because 
timeout is hardcoded in the bean. And I still have the redeliver problem.

Help will be appreciate

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