On Mar 30, 2009, at 9:32 PM, Scott Hernandez wrote:
> Well, I have configured a test app to use hibernate and I have a few
> problems (and a bit of success):
>
> I was able to get the same code working from a servlet, but when
> trying to get data I get an exception when running from a @Service (in
> the @PostConstruct method):
>
> [21:26:06.430] {main} java.lang.IllegalStateException:
> EntityManagerTransactionProxy[test,null]: @PersistenceContext
> EntityManager may not be used outside of a transaction
> [21:26:06.430] {main} at
>
> trying to use entityManager.getTransaction().begin got me this
> exception:
> java.lang.IllegalStateException: Container-manager @PersistenceContext
> may not use getTransaction.
>
> I'm guessing that the problem is that the @Service post construction
> is happened too soon, maybe.
It's a different issue, I believe. The EntityManager is intended to
be used inside a UserTransaction, i.e. a container-managed
transaction. The JavaEE model is that you're running inside a Session
bean, although that's not strictly necessary as long as it's inside a
transaction.
If you're managing transactions with the EntityManager, you need to
use EntityManagerFactory, not EntityManager. (It's been a little
while since I've read that part of the spec, though.)
-- Scott
>
>
> [snip]
>
>
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