[wildfly-dev] duel between JPA use of ClassFileTransformer and CDI implicit/explicit Bean Manager (why can't we just get along)...

[Emmanuel Bernard]

We can't do something as non user friendly :(

On Mon 2013-06-10  9:10, Jozef Hartinger wrote:
> Weld can be started before a JPA impl without a risk of suppressing 
> ClassFileTransformers under condition that all entities are annotated 
> with @Vetoed. We could document that as a requirement.
> 
> On 06/07/2013 06:20 PM, Scott Marlow wrote:
> > For application deployments that use ClassFileTransformer to
> > enhance/rewrite entity classes, we start the persistence unit service
> > (PersistenceProvider.createContainerEntityManagerFactory()) during the
> > Phase.FIRST_MODULE_USE (before any application classes have been loaded).
> >
> > For application deployments that have an explicit CDI Bean Manager,
> > there is a beans.xml that means the ClassFileTransformer will not work,
> > since the CDI Bean Manager will scan all of the application classes
> > (loading them), before the persistence unit service is started (so that
> > the persistence provider can use CDI in entity listeners).
> >
> > The same is also true for implicit CDI Bean manager support [1], expect
> > all application deployments that contain an ejb3 module, will be wired
> > for CDI (meaning JPA ClassFileTransformer support will work even less).
> >
> > I raised this on the JPA 2.1 EG [2] in response to an earlier
> > discussion, about switching to a two phase approach to address problems
> > like this (didn't discuss CDI implicit support then but am raising that
> > now).
> >
> > [3] talks about why we don't create the CDI bean managers before the
> > Install phase (would cause all application classes to be read which
> > breaks JPA ClassFileTransformer use).
> >
> > [4] is for adding implicit CDI support but is blocked currently by [5].
> >
> > We can add persistence unit flags (jboss.as.jpa.classtransformer=false)
> > for disabling JPA ClassFileTransformer support as a workaround but that
> > doesn't help enough since many deployments will have implicit CDI
> > support enabled (since they contain EJB modules).  We could add a way to
> > disable implicit CDI support as another workaround for deployments that
> > want to use ClassFileTransformer.
> >
> > I'm not yet seeing a proper fix for this.  Anyone else?
> >
> > Scott
> >
> > [1] http://docs.jboss.org/cdi/spec/1.1/cdi-spec.html#bean_archive
> > [2]
> > https://java.net/projects/jpa-spec/lists/jsr338-experts/archive/2013-06/message/0
> > [3] https://issues.jboss.org/browse/WFLY-1322
> > [4] https://issues.jboss.org/browse/WFLY-476
> > [5] https://issues.jboss.org/browse/WFLY-1463
> > _______________________________________________
> > wildfly-dev mailing list
> > wildfly-dev at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/wildfly-dev
> 
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