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Hibernate PreUpdateEvent does not provide old state of the entity  RSS feed

remyvrs vredestein
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i am trying to obtain the minimum between the old value and the new one during an entity update

yet, using the PreUpdateEventListener with the arg : PreUpdateEvent
Object[] getOldState()
The old state of the entity at the time it was last loaded from the database; can be null in the case of detached entities.
the old state does come null...

could someone please advice about how to obtain the old state?

btw, i have tried to add a line of
session.buildLockRequest(LockOptions.NONE).lock() , hopping that this will reattach it before the update
yet, in this case, there seems to be problem because the event listener is not triggered anymore
It is sorta covered in the JavaRanch Style Guide.
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