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the EntityManager API standardizes ORM CRUD operations. But standardization isn t the only benefit of the simplified API: another great feature is that it can run outside the container. The cleanly separated Java Persistence API As we touched on in section 1.2.3, API persistence isn t just a solution for serverside applications. Persistence is a problem that even a standalone Swing-based desktop application has to solve. This is the realization that drove the decision to make JPA a cleanly separated API in its own right, that can be run outside an EJB 3 container. Much like JDBC, JPA is intended to be a general-purpose persistence solution for any Java application. This is a remarkably positive step in expanding the scope of EJB 3 outside the traditional realm of server applications. Better persistence-tier OO support Because EJB 2 entity beans were record oriented, they didn t support rich OO features like inheritance and polymorphism, and they didn t permit the mixing of persistent state and domain logic. As you saw in section 1.1.3, this made it impossible to model the domain layer in DDD architecture. EJB 3 entities have robust OO support, not just because they are POJOs but also because the JPA ORM mapping scheme is designed with OO in mind. JPQL has robust support for OO as well. Getting impatient to learn more about JPA Stick with us and we ll have many discussions on JPA throughout the book; part 3 is devoted to discussions on JPA. Test-driven development has become quite popular because it can dramatically improve performance of software applications. Let s see how EJB 3 improves the testability of applications.

The event syntax discussed so far is called trivial event. Similar to the trivial properties syntax, the compiler provides the backing storage field and the accessor methods automatically.

Being able to unit-test component state or logic in response to simulated input is a critical technique in increasing code quality. In EJB 2, only functional testing of components was possible since components had to be deployed to the container to be executed. While functional testing simulating user interactions with the system is invaluable, it is not a good substitute for lower-level unit testing. Because all EJB 3 components are POJOs, they can easily be executed outside the container. This means that it is possible to unit-test all component business logic using testing frameworks such as JUnit or TestNG. These are just the primary changes to EJB 3; there are many more that we ll cover throughout the book.

Just in case you thought you had to choose between Spring and EJB 3, we thought we d mention why they don t necessarily need to be regarded as competing technologies.

As we mentioned earlier, EJB 3 and Spring are often seen as competitors; however, if you look more closely, you can see that they can also be complementary. Spring has some particularly strong points: support for inversion of control (IoC) for components with simple lifecycles such as singletons; feature-heavy (but slightly more complex) aspect-oriented programming (AOP) support; a number of simple interfaces such as JDBCTemplate and JMSTemplate utilizing common usage patterns of low-level Java EE APIs; and so on. EJB 3, on the other hand, provides better support for transparent state management with stateful session beans, pooling, thread-safety, robust messaging support with MDBs, integrated support for distributed transaction management, standardized automated persistence through JPA, and so on. From a levelheaded, neutral point of view, EJB 3 and Spring can be complementary technologies. The good news is that parts of both the Spring and Java EE communities are working diligently to make Spring/EJB 3 integration a reality. This is particularly good news if you have a significant investment in Spring but want to utilize the benefits of EJB 3. We ll talk about Spring/EJB 3 integration in more detail in chapter 16. However, we d like to list the possibilities now. Treating EJB 3 business-tier components as Spring beans It is possible to treat EJB 3 business-tier components as Spring beans. This translates into an architecture shown in figure 1.8. In this architecture, Spring is used for gluing together the application that contains EJB 3 business-tier components. The Spring Pitchfork project, part of Spring 2, is meant to make such an integration scenario completely transparent. The Spring framework plans to

Figure 1.8 Spring/EJB 3 integration strategy. It is possible to use EJB 3 business-tier components as if they were Spring beans. This allows you to use the complementary strengths of both technologies in a hybrid fashion.