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

[Jozef Hartinger]

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
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