Hi Dmitry, Ok. Sure - but since these are properties/components you need to look for more than just the RootClass. RootClass is only used for *entities* not for *values* which components and are an example of. Here you need to look for the property type as shown in Cfg2Java. hbm.xml supports these two ways of defining subclasses: <class name="Person"> ... <subclass name="Student"> ... </subclass> </class> OR <class name="Person"> ... </class> <subclass name="Student" extends="Person"> ... </subclass> First one will always be in the same file. Second one can be in the same or different files. Please write unittests for it before doing that. Should be trivial to test your lookup methods with sample hbm.xml and annotated classes. Doesn't need any UI setup to verify that. /max -- -- Max Rydahl Andersen callto://max.rydahl.andersen Hibernate max(a)hibernate.org http://hibernate.org JBoss a division of Red Hat max.andersen(a)jboss.com