Getting Started with WebSphere Application Server

5
Chapter 5 – Enterprise Java Beans
An Enterprise Java Bean (EJB) is a mechanism to encapsulate business logic of an
application. Community Edition supports the latest specification, EJB 3.0. This chapter
discusses the development of EJBs in Community Edition.
In this chapter you will learn about:
• How to develop session beans in Community Edition
• How to develop an application client in Community Edition
• How to develop JPA-based applications in Community Edition
5.1 Community Edition Enterprise Java Beans: The big picture
Figure 5.1 provides an overview of EJB development in Community Edition. In the figure,
there is an Admin Client on the right side which represents the Community Edition Admin
console or the Eclipse IDE from where a user is managing the EJB application. As shown
in (1), first, developers create EJBs and deploy them into the server. Then, developers
make use of the EJBs by invoking them in a servlet (2) or by JNDI naming in an application
client (3) or a Plain Old Java Object (POJO) client (4). As part of EJB specification, you can
also create JPA-based applications (5) and deploy them with Community Edition.