EJB 3.0 introduces a standard O/R mapping specification and moves to POJO based persistence. PowerDesigner provides support for EJB 3 through an extension file.
To enable the EJB 3 extensions in your model, select Attach an Extension tool, select the EJB 3.0 file (on the O/R Mappingtab), and click OK to attach it.
, click theEJB 3.0 persistence provides a lightweight persistence solution for Java applications. It supports powerful, high performance and transparent object/relational persistence, which can be used both in container and out of container.
EJB 3.0 persistence lets you develop persistent objects using POJO (Plain Old Java Object). All the common Java idioms, including association, inheritance, polymorphism, composition, and the Java collections framework are supported. EJB 3.0 persistence allows you to express queries in its own portable SQL extension (EJBQL), as well as in native SQL.