How easy/difficult is it to move from EJB 2.0 to EJB 3.0. Does EJB 2 provide any foundation or EJB 3 is a totally new dimension?
posted 9 years ago
Migration from EJB 2 to EJB 3 is easy but a mechanical task. The most challenging task is to migrate CMP entity beans. You would probably want to remodel your persistence tier when you want to migrate to EJB 3 JPA instead of just migrating the code.
We have a complete chapter on migration in my book EJB 3 In Action. I had a presentation at JavaZone Norway on this topic