It's pretty good. It's got the main concepts down, plus it's got OperationDemarcation. OperationDemarcation is the new bacon. I wish I'd thought of it years ago. Plus a few utility classes like UserMessages, BeanUtils, and real unit tests instead of the toy examples on ATG mockobjects.

I would like to give a shout out to Enterprise Architect. EA has done the impossible: it makes creating UML diagrams fun. It's also at least 25 times cheaper than Together/J or Rational Rose. And it doesn't crash like Rational Rose either.

The javadoc comments provide more detail about the purpose of each class. Note that the benefit of the manager class is not that you can replace the repository entirely, but that you have the flexibility to decide when and how to use it. You might want to cache some data, make some remote calls somewhere else, consult an authentication service... who knows. Putting a layer in from the beginning ensures that any changes to the repository don't have to propagate to other areas of the application.

Let me know what you think, and I'll update the project as needed.