How I would probably try to solve this - and I have not had time to really sit 
down and think it through fully - is to have an interceptor wrapped around my 
EJB that knows how to catch the exception and forward to the appropriate 
recovery mechanism. This is always either:

(1) A page that tells the user "someone else updated this, go back to the start 
and try again"
(2) A page that tells that user "heres the data that you entered, heres the 
current data in the database, you need to merge those changes together" - and 
then this work needs to be done in a new PC and txn.

To "get" a new PC/txn to work with, call a session bean in the context of a 
REQUIRES_NEW transaction (if it is stateful, it needs to be a newly 
instantiated SFSB).

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