That's actually where I first came across BCE ... during the analysis phase of a large RUP project. We had some coaching from Rational (as they were at the time) to help us take our use cases through to BCE style diagrams. It was then a "simple" transformation from controllers to J2EE session beans and from entities to J2EE entity beans. I seem to remember that Rational Rose even had a set of icons for the appropriate EJB stereotypes. Ah, good times. ;-)
But yes, the devil is indeed in those annoying details!
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