ModelJ Code Generator
ModelJ looks like an interesting tool if you're using Struts, EJBs and JBoss.
ModelJ is a RAD (Rapid Application Development) tool that uses code generation to create complete J2EE designs using the Struts and EJB frameworks. With ModelJ, you are only a few steps away from a complete application readily deployable to JBoss, the leading open-source J2EE Application Server. ModelJ uses proven design patterns to ensure a robust, easy-to-maintain design.