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In the latest digital edition of JavaPro (requires registration), Oracle's Debu Panda highlights some of the differences between EJB 2.x and EJB 3.0 and gives advice on what you can do with all that old boiler plate code (for example turning create methods into constructors).
Obviously you don't have to do any migration from EJB 2.x to EJB 3.0 (older applications should just continue to work) but if you want the radical simplification available in Java EE 5 then some degree of refactoring might be worth while.
