Hardy Ferentschik: I'm starting to wonder about the test set up, though. As per the annotation on the embedding entity Location, field access type is to be used. Still in coordinates.xml two attributes are configured for ZeroCoordinates which actually don't exist with the required access type. Does this configuration make sense at all?

That is the question again whether it is the annotations processor's tasks to verify these type of things. IMO that is related to the METAGEN-96 discussion. The problem here is really this lazy initialization.