>
> On 11/07/2011, at 4:07 AM, Mark Struberg wrote:
>
> > Hi folks!
> >
> > While reviewing an OWB bug report, 2 questions came
> up:
> >
> > a.) EnvironmentUtils#isEEEnvironment() relies on the
> absence of 'javax.ejb.Stateless' to decide if a
> PersitenceUnit gets injected or if you need to do it
> yourself. I think this is an unrelieable assumption. E.g.
> there are a few Extensions which emulate Stateless Session
> beans via a CDI Extension by morphing them into
> @ApplicationScoped.
>
> This is not ideal, but I don't think there is really any
> portable way to detect if the environment is an EE
> environment or not. I was originally planning to add a
> method for configuring this, but it appears I did not get
> around to it.
>
> >
> > b.) in
> ManagedPersistenceContextExtension#registerManagedPersistenceContext
> you register the bean for the EntityManager as
> passivationCapable. This is never _never_ NEVER true. The
> EntityManager is not Serializable! There is imo no way to
> have an EntityManager in a bean scoped other than
> @RequestScoped or shorter (e.g. @TransactionalScoped). Any
> other trick is not working in a portable way. This is mainly
> caused by JPA still supporting pessimistic locking (_real_
> locks in the database) as first class citizens.
> >
>
> Without this it is not possible to have a conversation
> scoped entity manager. The hibernate EntityManager is in
> fact Serializable. Locks should not be a problem as long as
> you do not attempt to serialise the EM in the middle of a
> transaction.
>
> Stuart
>
>
> > But I'd be happy if anyone could enlighten me and tell
> us how it works ;)
> >
> > LieGrue,
> > strub
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> >
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> >
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>
>
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