What is the Benefit of EJB2.0 CMP when using BC4J?

I see much being made of the ability to use BC4J in conjunction with EJB2.0 CMP, but I am unclear of the benefits of doing so as I had understood that BC4J can effectively take care of persistance? There must be more to it no?

The new feature we introduced in BC4J for 9.0.3 is the ability to use the BC4J "data model" components -- our View Object and Application Module -- against EJB 2.0 CMP entity beans. It is targeted for developers who have already decided, before coming to the BC4J framework, to implement their business domain classes as EJB 2.0 CMP entity beans with local interfaces, and allows them to take advantage of the "top-half" of the BC4J framework's major functionality related to client data-binding.
At present, there isn't really a benefit per se of using EJB 2.0 CMP entity beans, you actually lose a number of interesting application-building features that the simple BC4J entity object classes give you. The BC4J entity object saves you the trouble of having to worry about persistence, too, like the CMP entity bean, with a declarative deployment-descriptor-based approach, too. However if you have made the choice for using EJB 2.0 CMP entity beans, then there definitely IS benefit in combining them with the BC4J Data Model layer features because this saves you time in building your client user interfaces.
We are working for future releases with the OC4J team who are participating in the EJB specification's future editions to try and incorporate into an evolution of the entity beans spec, a number of the added value features that BC4J entity objects offer for simplifying common application-building tasks, but that will take some time to accomplish in practice.

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