I was finally able to get a simple example working on Apache Karaf using 
container-managed Enterprise OSGi JPA.

Pull request:
https://github.com/hibernate/hibernate-orm/pull/465/files

I would really appreciate it if some of you could grab the following fork and 
try it out in your own environments – feedback is definitely needed:
https://github.com/brmeyer/hibernate-orm/tree/4.2-osgi

A simple test client bundle is available as a reference. Something like this 
will eventually wind up in the doc examples. Instructions are in the README 
(rough draft).
https://github.com/brmeyer/HibernateOSGi

There's a few caveats to ORM at this point:
1.) I have not yet tested a bundle creating and maintaining it's own 
EntityManagerFactory or SessionFactory. Only container-managed has been used so 
far.
2.) Only basic support for persistence units is available. We have not handled 
the use of OSGi services to register Integrators, etc.
3.) IMPORTANT: We can currently handle only annotated classes explicitly listed 
in your persistence unit. There's a few roadblocks preventing us from scanning 
for mapping files, classes, etc.
4.) The provided feature.xml files are fairly order-specific.  Comments within 
them (and the proposal wiki) outline the issue.

The proposal wiki is updated with more info and questions:
https://github.com/hibernate/hibernate-orm/wiki/Proposal:-OSGi

We're not comfortable releasing this until the community is able to help 
confirm the fork.  Any help is sincerely appreciated!

Brett Meyer
Red Hat Software Engineer, Hibernate
+1 260.349.5732

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