Hi, I have some questions regarding optimistic locking. 1) Can it happen in my container managed bean? 2) How can I deal with it? Can I find out if my container just started the transaction? Can I repeat the transaction it in this case? 3) As far as I would guess optimistic locking does not lock the database, so concurrent transaction can be executed on the same data without delay regardless if they write or read? I.e if a whole transaction will last 5 seconds where multiple services are involved, within these 5 seconds also other transactions from the same bean can be started and handled? Regards, Karsten