When I extend UserType, I must override the returnedClass() method. My application use some domain objects witch are persisted with our home-made persistant framework. So I have to extends UserType for each of these objects (Just to override the returnedClass() method). So I do for my TypeSafeEnum. It seem the returnedClass value can be inffered from the persisted property by reflexion, so is it planed to solve this issue ?

What about interfaces