Dependency problems upgrading Guice with Warp-Persist

Question

We have an application that uses Guice 1.0 with warp-servlet and warp-persist, and we'd like to upgrade to Guice 2 or 3. However, we're hitting a web of dependencies that is making it complicated.

Does anyone know of a simple way (as close as possible to drop-in replacement) to either make warp-persist work with newer Guice, or make Guice-persist work with straight Hibernate?

• Warp-persist requires warp-servlet
• Warp-servlet and warp-persist only support Guice 1.0
• Guice-persist appears to be a replacement for warp-persist, but it only supports JPA, whereas we use Hibernate directly (with a significant legacy of criteria-based code that makes porting to JPA non-trivial).
• Guice-persist also claims to have a way of supporting non-JPA data access, but there doesn't appear to be any documentation of this.
• Warp-persist doesn't seem to support Hibernate 4, so we can't upgrade Hibernate either.

Answer 1

you can access the hibernate session from a JPA entity manager. This allows you to use migrate away from warp.

@Singleton
public class SessionProvider implements Provider<Session> {

    /** The entity manger to retrieve the session from. */
    @Inject
    private Provider<EntityManager> entityManagerProvider;

    /**
    * @return the Hibernate session, being the delegate of the entity manager provided by the injected entity manager provider.
    */
    @Override
    public Session get() {
        final Session session = (Session) entityManagerProvider.get().getDelegate();
        return session;
    }
}

All you need to do is configure Hibernate to be you JPA implementation. Also I would recommend to use onami persist. Guice persist seems to be abandoned.