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Renaissance of EJB
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support EJB 3 annotation metadata specifying stateless session beans, interceptors, resource injection, and so on. Integrating the JPA into Spring Suppose that you find Spring is a good fit for your business-tier needs and you simply want to standardize your persistence layer. In this case, it is easy to integrate JPA directly into Spring, much like Spring/Hibernate or Spring/JDO integration. This scheme is shown in figure 1.9.
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Figure 1.9 Spring/JPA integration. Because JPA is a cleanly separable API, you can integrate Spring with JPA just as you would integrate Hibernate.
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In addition to using Spring with JPA, you may find yourself in a situation where you would like to use both Spring and EJB 3 session beans together. Let s examine the possibilities of such integration. Using Spring interfaces inside EJB 3 components Yet another interesting idea is to use some of the Spring interfaces like JDBCTemplate and JMSTemplate or even Spring beans inside EJB 3 components. You can do this either through direct instantiation or access through the Spring application context. Container vendors like JBoss, Oracle, and BEA are working to provide seamless support for integrating Spring beans into session beans and MDBs. This kind of integration is visualized in figure 1.10. We ll discuss combining the power of EJB 3 and Spring in chapter 16.
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Figure 1.10 In certain cases, it might be a good idea to use Spring from EJB 3. Although it is possible to do so today, such support is likely to be much better in the future.
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What s what in EJB 3
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You should now have a good idea of what EJB 3 is, what it brings to the table, and why you should consider using it to build server-side applications. We gave you an overview of the new features in EJB 3, including these important points:
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EJB 3 components are POJOs configurable through simplified meta-
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data annotations.
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Accessing EJBs from client applications has become very simple using dependency injection.
EJB 3 standardizes the persistence with the Java Persistence API, which defines POJO entities that can be used both inside and outside the container.
We also provided a taste of code to show how EJB 3 addresses development pain points that were inherent with EJB 2, and we took a brief look at how EJB 3 can be used with Spring. Armed with this essential background, you are probably eager to look at more code. We aim to satisfy this desire, at least in part, in the next chapter. Get ready for a whirlwind tour of the entire EJB 3 API that shows just how easy the code really is.
A first taste of EJB
This chapter covers
Metadata annotations Dependency injection The ActionBazaar application Code examples of session beans, MDBs, and entities
A first taste of EJB
In this age of hyper-competitiveness, learning a new technology by balancing a book on your lap while hacking away at a business problem on the keyboard has become the norm. Let s face it somewhere deep down you probably prefer this baptism by fire to trudging the same old roads over and over again. This chapter is for the brave pioneer in all of us, eager to peek over the horizon into the new world of EJB 3. The first chapter gave you a 20,000-foot view of the EJB 3 landscape from on board a hypersonic jet. We defined EJB, described the services it offers as well as the EJB 3 architectural vision, and listed the different parts of EJB 3. This chapter is a low-altitude fly-over with a reconnaissance airplane. Here, we ll take a quick look at the code for solving a realistic problem using EJB 3. The example solution will use all of the EJB 3 components types, a layered architecture, and some of the services we discussed in chapter 1. EJB 3 offers a wide range of features and services. To keep things sane, the examples in this chapter are designed to show you the high-level features and services of EJB 3, and to introduce you to the major players: the beans and clients. Thanks to the almost invisible way most EJB 3 services are delivered, this is pretty easy to do. You ll see exactly how easy and useful EJB 3 is and how quickly you could pick it up. We start by covering some basic concepts necessary for understanding the examples, and then we introduce the application that runs throughout the book: ActionBazaar. In the rest of the chapter, we illustrate each EJB type with an example from the ActionBazaar application. We implement business logic with session beans and then we add the power of asynchronous messaging by adding a messagedriven bean (MDB). Finally you ll discover the most powerful innovation of EJB 3 by looking at a simple example of a Java Persistence API (JPA) entity. If you aren t a big fan of views from heights, don t worry too much. Think of this chapter as that first day at a new workplace, shaking hands with the stranger in the next cubicle. In the chapters that follow, you ll get to know more about your new coworkers likes, dislikes, and eccentricities; and you ll learn how to work around these foibles. All you are expected to do right now is put names to faces.
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