discusses EJB inheritance
in part 1 of a series on O'Reilly.
"Entity beans are objects that represent data coming from a persistent store, such as a database. The key word here is objects. Entity beans encapsulate the data and business logic. But what about the two other principles, inheritance and polymorphism?
The bad news is that entity beans do not easily enable the use of these principles. The good news is that if you follow certain restrictions and tricks, it can be done. This series of articles describes some techniques to put inheritance and polymorphism back into entity beans.
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