In your case NetBeans is probably right. Injecting entity manager directly makes
it a container-managed entity manager.
See JPA spec sections:
5.5 Controlling Transactions
...
A container-managed entity manager must be a JTA entity manager.
5.2.1 Obtaining an Entity Manager in the Java EE Environment
A container-managed entity manager is obtained by the application through
dependency injection, or direct lookup of the entity manager in the JNDI namespace.
You can use UserTransactions to control JTA entity manager, but you need to call
em.joinTransaction() after you started it.
regards,
-marina
Ryan de Laplante wrote:
> I don't know if NetBeans is buggy or not.. I don't understand what I'm
> supposed to do to solve this problem.
> I inject the entity manager like this:
>
> @PersistenceContext(unitName="MyPU")
> private EntityManager em;
>
>
> Thanks,
> Ryan
>
>
> Marina Vatkina wrote:
>
>> Hi Ryan,
>>
>> Removing transaction-type doesn't make a difference - it's JTA by
>> default in a Java EE environment. If NetBeans doesn't work correctly,
>> please file a bug with NetBeans directly.
>>
>> How do you get a hold of EM? Do you
>> a) call Persistence.createEMF()
>> b) inject or look up EMF
>> c) inject or look up EM
>>
>> thanks,
>> -marina
>>
>> Ryan de Laplante wrote:
>>
>>> Hi,
>>>
>>> I have a Java 5 web application who's only purpose is to provide a
>>> web service. The web service uses JPA to read an entity from the
>>> database, make a change and save it back into the db. Because this
>>> is not an EJB, I have to manually begin and commit a transaction for
>>> persist() to work.
>>>
>>> When I do the following, the app server throws an
>>> IllegalStateException ("Cannot use an EntityTransaction while using
>>> JTA.")
>>>
>>> EntityTransaction trans;
>>> trans = em.getTransaction();
>>>
>>>
>>> I opened my persistence.xml in NetBean's visual editor, unchecked
>>> "Use Java Transaction APIs", then saved and redeployed. This did not
>>> make a difference. I noticed a transaction-type="JTA" attribute was
>>> still on the <persistence-unit> element so I removed it, saved and
>>> redeployed. I still get an exception.
>>>
>>>
>>> Thanks,
>>> Ryan
>>>
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