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> ## Persistence in the EJB Tier

> This chapter describes how to use the Java Persistence API from enterprise beans. The material here focuses on the source code and settings of two examples. The first example called `order` is an application that uses a stateful session bean to manage entities related to an ordering system. The second example is `roster`, an application that manages a community sports system. This chapter assumes that you are familiar with the concepts detailed in Chapter 24, "Introduction to the Java Persistence API."