Chapter 9 Generating Persistent Objects for Java and JSF Pages
In EJB 3.0, Mapped superclasses are used to define state and mapping information that is common to multiple entity classes. They are not mapped to separate tables of their own. You cannot currently define Mapped superclasses in PowerDesigner. However, the MappedSuperclass annotation for classes that are not leaf classes in the hierarchy when you apply the TABLE_PER_CLASS strategy (see the O/R Mapping chapter).
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