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> ## Container-Managed Persistence Examples

> An entity bean with container-managed persistence (CMP) offers important advantages to the bean developer. First, the EJB container handles all database storage and retrieval calls. Second, the container manages the relationships between the entity beans. Because of these services, you don't have to code the database access calls in the entity bean. Instead, you specify settings in the bean's deployment descriptor. Not only does this approach save you time, but also it makes the bean portable across various database servers.

> This chapter focuses on the source code and deployment settings for an example called `RosterApp`, an application that features entity beans with container-managed persistence. If you are unfamiliar with the terms and concepts mentioned in this chapter, please consult the section Container-Managed Persistence.

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