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EJB 2 to EJB 3.0

 
Patrick Mugabe
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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?
 
Debu Panda
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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

http://www2.java.no/web/show.do?page=92&articleid=4472

-Debu
 
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