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Special Edition Using Enterprise JavaBeans™ 2.0 by Brian Keeton, Chuck Cavaness

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What Is an Entity Bean?

As you saw in Chapter 3, “EJB Concepts,” the EJB specification defines three types of enterprise beans: entity, session, and message-driven beans. As was pointed out there, the specification assigns distinct roles to each of these bean types. This chapter and the three that follow introduce you to the purpose behind entity beans and teach you how to implement and deploy them. Later chapters do the same for session and message-driven beans. The fact that four chapters are dedicated to entity beans should be your first indication that there’s plenty to learn about this first type of enterprise bean.

An entity bean represents a persistent object that usually corresponds to a row in a relational database table (or several ...

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