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Using EJBs in Web Dynpro and others model tecnology patterns

I'm having difficults in order to implement the business logic in Java.

I did a simple application and I put all business rules inside de controller in the web dynpro. Everything is ok to users, but I know that this isn't indicate.

I tried to encapsulate de business rules and dao in a session bea, but I'm not sucessfull. I'd like to receive advices/tutorial about model, I found some treads in the forum, but almost all links in the sdn are browke. I was thinking in using hibernate and spring, but I don't know with it's a good choive to sap world.

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