What s what in EJB 3 in Java

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What s what in EJB 3
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One day, when God was looking over his creatures, he noticed a boy named Sadhu whose humor and cleverness pleased him. God felt generous that day and granted Sadhu three wishes. Sadhu asked for three reincarnations one as a ladybug, one as an elephant, and the last as a cow. Surprised by these wishes, God asked Sadhu to explain himself. The boy replied, I want to be a ladybug so that everyone in the world will admire me for my beauty and forgive the fact that I do no work. Being an elephant will be fun because I can gobble down enormous amounts of food without being ridiculed. I will like being a cow the best because I will be loved by all and useful to mankind. God was charmed by these answers and allowed Sadhu to live through the three incarnations. He then made Sadhu a morning star for his service to humankind as a cow. EJB too has lived through three incarnations. When it was first released, the industry was dazzled by its innovations. But like the ladybug, EJB 1 had limited functionality. The second EJB incarnation was just about as heavy as the largest of our beloved pachyderms. The brave souls who could not do without its elephant power had to tame the awesome complexity of EJB 2. And finally, in its third incarnation, EJB has become much more useful to the huddled masses, just like the gentle bovine that is sacred for Hindus and respected as a mother whose milk feeds us well. Many people have put in a lot of hard work to make EJB 3 as simple and lightweight as possible without sacrificing enterprise-ready power. EJB components are now little more than plain old Java objects (POJOs) that look a lot like code in a Hello World program. We hope you agree with us as you read through the next chapters that EJB 3 has all the makings of a star. We ve strived to keep this book as practical as possible without skimping on content. The book is designed to help you learn EJB 3 as quickly and easily as possible. At the same time, we won t neglect the basics where needed. We ll also dive into deep waters with you where we can, share with you all the amazing sights we ve discovered, and warn you about any lurking dangers. This book is about the radical transformation of an important and uniquely influential technology in the Java world. We suspect you are not picking this book up to learn too much about EJB 2. You probably either already know EJB or are completely new to the world of EJB. In either case, spending too much time on previous versions is a waste of your time you won t be surprised to learn that EJB 3 and EJB 2 have very little in common. If you are curious about the journey that brought us to the current point, we encourage you to pick up one of the many good books on the previous versions of EJB.
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EJB overview
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Our goal in this chapter is to tell you what s what in EJB 3, explain why you should consider using it, and, for EJB 2 veterans, outline the significant improvements the newest version offers. We ll then jump right into code in the next chapter to build on the momentum of this one. With these goals in mind, let s now start with a broad overview of EJB.
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1.1 EJB overview
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In very straightforward terms, Enterprise JavaBeans (EJB) is a platform for building portable, reusable, and scalable business applications using the Java programming language. Since its initial incarnation, EJB has been touted as a component model or framework that lets you build enterprise Java applications without having to reinvent services such as transactions, security, automated persistence, and so on that you may need for building an application. EJB allows application developers to focus on building business logic without having to spend time on building infrastructure code. From a developer s point of view, an EJB is a piece of Java code that executes in a specialized runtime environment called the EJB container, which provides a number of component services. The persistence services are provided by a specialized framework called the persistence provider. We ll talk more about the EJB container, persistence provider, and services in section 1.3. In this section, you ll learn how EJB functions as both a component and a framework. We ll also examine how EJB lends itself to building layered applications. We ll round off this section by listing a few reasons why EJB might be right for you.
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