Hi, for some particular project, I'd like to have a custom IdentifierGenerator, which could be thought of as an extension of the "native" IdentifierGenerator. Basically, it ought to take the id generated by the "native" generator, but then do some magic with it, for example add a prefix. (Yes, I know, don't push me on that, I have already lost my struggle against a "telling ID".) Such an IdGenerator is easily implemented: Create a class, which queries the IdentifierGeneratorFactory for the "native" IdentifierGenerator and use that. (Works fine.) The problem is, that the "native" generator is sometimes implementing PostInsertIdentifierGenerator. Of course, I can have my generator implement PostInsertIdentifierGenerator as well, but that means that it will break on systems without a sequence. OTOH, I can remove the interface, but then it won't work on the other systems. An alternative might be, to add a new "myNative" term to the IdentifierGeneratorFactory, but that class neither allows extension (it's final, for whatever reason) nor does it support extending the map of builtin types. Any ideas? Thanks, Jochen -- Germanys national anthem is the most boring in the world - how telling!