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Part V
Developing
Enterprise Scale Software
Chapter 21
Introduction to Enterprise JavaBeans
This chapter will serve as an almost criminally brief introduction to Enterprise JavaBeans, their varieties, and their uses.
21.1 WHAT YOU WILL LEARN
You will learn the basics of Enterprise JavaBeans and the Java Naming and Directory Interface, which is how applications and EJB’s meet up with one another.
21.2 EXPANDING TO EJBS
All right, we’ll admit it. It is a bit of a stretch to expand our sample application to the J2EE Enterprise JavaBean component model. The truth is, given the small data requirements and simplicity of our application, the Web front end that we put on our application in the previous chapters is probably sufficient to scale our application to even very large organizations.
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That confessed, we still think our example is the best way to address our topic. Why? Because EJBs are a large topic, worthy of several books (and we encourage you to read some of them, such as Enterprise JavaBeans Component Architecture by Gail Anderson and Paul Anderson (ISBN 0-13-035571-2). We simply cannot teach you all about EJBs in our book. Our goal here is to intro- duce the concepts, provide a working example, and explain how to deploy and maintain an EJB system on Linux using JBoss. Believe us, we’ll have enough to cover to achieve that modest goal.
21.2.1 EJB Concepts
21.2.2 Bean Types
Stateless Session Beans
Stateful Session Beans
21.2.3 Under the Hood
21.3.1 Naming and Directory System Concepts
21.3.2 Common Directory Services
21.3.3 Putting a Face to a Name: JNDI
21.3.4 Using JNDI with JBoss
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