Hello
Sometimes Hibernate (despite not launching "merge") update entity.
In application there is a few methods which changes record, and at the end of transaction (JBoss manages transaction) there is EJB component which calls em.merge.
But Hibernate sometimes save changes earlier. What is worse, some of this updates do nothing (sets previously setted value)
I know, thet Hibernate can do update whenever it wants. But is there possibility to forbid that?
I would like to force Hibernate to make updates only whene merge is called. Is it possible?

Any help?
Can FlushMode be used to do that?

Sounds like you are making your changes inside a container (JBoss), so your entities stay managed while doing this. Changes to managed entities are flushed automatically at transaction end.

You could avoid that by detaching them (((Session) entityManager.getDelegate()).evict()) which is not the nicest solution or by managing your Transactions manually (Look at the @TransactionAttribute annotation).