Chapter 8. Apache OpenJPA

In this chapter we discuss OpenJPA, an implementation of the Java Persistence API 1.0 specification. We will fill in our evaluation template and implement our common example with OpenJPA. We will discuss OpenJPA extensions to the specification and finish with a brief look forward at JPA 2.0.

Background

In Chapter 1, “A Brief History of Object-Relational Mapping,” we gave some history of the Java Persistence space. We discussed the development of the EJB spec from a persistence standpoint, how it grew in developer dissatisfaction over the years, and how open-source frameworks like Hibernate began to grow. We also discussed how this led to the creation of JPA.

As discussed in Chapter 1, by the time version 2 of the Enterprise ...

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