MDB's are designed for asynchronous + decoupled + parallel message processing !!!  

If your special use case does not fit into this scenario DO NOT abuse MDB's for 
something they are not designed for ! Even for a singleton MDB there is no guarantee 
for ordered (re-)delivery of messages and - even more worse- your application will not 
scale at all ! 

Rethink your application needs ! If you have to process multiple messages at once, put 
them all into one message instead of using separate messages. If this is not possible 
you might have to use a different application pattern (e.g. session\entity beans  )

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