CHAPTER 3
Entities and the Java Persistence API
Now that you have explored how EJB provides business services through session beans, we’ll turn your attention to a different kind of component called entities, which are classes that represent tables in a database, and whose instances represent rows in those tables. Whereas session beans provide services to a client application, entities represent the business data. A common pattern is for a session bean to provide a convenient interface for manipulating entities in the context of transactional, security, access control, and other enterprise services. Methods to perform Create, Retrieve, Update, ...
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