Hi there.
I've been using Hibernate + JPA for a few months. I use application managed transactions, which means that I manually start and commit(or rollback) transactions.
Now, I want to use Glassfish EntityManager instead of Hibernate and thus I want it to automatically manage transactions; to achieve this I understand that I have to change a setting in the persistence unit to JPA. But what I really need to understand is how Glassfish+JTA manages transactions: how does it know when to begin them? How does it know where to end them?
This is not clear to me; I would be very grateful if you could point to any good documentation on this topic.
Thank you very much,
Donato
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