If you're looking for a kick-off point in documentation form for BC4J and the J2EE framework here is the place to go. There are four links to articles which give good background information on these topics:
Ten Key Benefits of Oracle Business Components for Application Developers
Simplify J2EE and EJB Development with BC4J
Building a Web Store with Struts and BC4J Frameworks
Business Rules in BC4J
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