Is it possible to use the Hibernate Annotation Extensions in the JBossAS server? I'm actually going to give it a try right now in our sample app, I just wanted to make sure there isn't a reason technical reason we should not do this (other than portability which isn't a concern right now)?

Specifically, our current application is based on Hibernate and we are migrating to JSF/Seam/Facelets which means we are going to start running in an App Server (so we are going to start with JBossAS 4.x).

We are using several extensions (@TypeDefs, @Index, and Criterias) heavily in our application. In the sample app we put together, we are using a HibernateSession instead of an EntityManager.

However, we would use the EntityManager if we could use the Hibernate Annotation extensions unless there is a reason to stick with the HibSession.

I saw that in JBossAS we could cast the em to a HibSession, and I wanted to make sure there isn't a reason we should not use the annotation extensions.

Thanks,
Chris....

Depends if you'll ever use your pojos in non-Hibernate environment ... like maybe BEA with Kodo, ...

As long as you're ok to use the Hibernate engine underneath, there is absolutly no problem. JBoss EJB3 works on top of Hibernate EntityManager and Annotations.