Hbm.xml e xdoclet

Do url http://www.hibernate.org/102.html

CodeGenerator (hbm2java): This tool is part of the separate Hibernate Extensions download. It reads Hibernate mapping XML files and generates Java code for your domain/business and persistence layer (finder method generation). It is extremely flexible and can even be customized with Velocity templates. A nice trick is to automatically generate XDoclet Javadoc tags, so you will have a full roundtrip cycle starting from the top again. See the Hibernate reference documentation for more information.

Veja mais em http://www.hibernate.org/30.html e faça o download em http://prdownloads.sourceforge.net/hibernate/?sort_by=date&sort=desc

Até.