I think the only real way to solve this is to pass in a BM proxy to JPA, that delegates to the real BM once it becomes available. As long as JPA does not attempt to use the BM during startup this should be fine.

Stuart

On Sat, Jun 8, 2013 at 2:20 AM, Scott Marlow <smarlow@redhat.com> 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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