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MDBs and Transactions

 
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Ok,
I am bit confused with how exactly MDBs work with Transactions.

For example,
suppose we have a simple standalone java message producer which sends a message to a Queue. A MDB's onMessage() picks it up.
Let's say the MDB makes some updates to the database and then invokes a method on a stateless session bean which also updates a database.

By default the transaction attribute of the MDB and stateless session bean would be REQUIRED.

If the stateless session bean database update fails, I presume the MDB's database updates also get rolled back.
But, does the message get rolled back? If not when would the message be rolled back?

Does it make any difference if the MDB is a topic or a queue? Does it make any difference if the message producer is a standalone client or
a stateless session bean with it's own transactional behaviour?

Any help appreciated.

Thanks.

 
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