> Hi,
> I have a question about Entity Manager,
> does the wirte data opertion(such as persiste/remove)
> must
> be executed in a transaction?
Yes.
> In the BMT ejb bean, does the
> EntityManager.persiste() method
> must be a JTA transaction
Yes. Use UserTransaction in BMT session beans.
> or in the {
> em.getTransaction.begin
> ).....em.getTransaction.commit() }?
ONLY IF the entity manager uses resource local transaction, which is very rare in JavaEE environment.
> if not, does the EntityManager.persiste() will not
> wirte to data
> to database?
Exception
> I checked the JPA specification, did not find the
> instruction.
>
It's in the spec, but the JPA spec probably doesn't mention this particular usecase.
-cheng
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