J2EE™ and JAX™: Developing Web Applications and Web Services

19.1. Introduction to Enterprise JavaBeans

If we were to move from a simple Java application, such as the one we began with in Chapter 2, and try to redesign it directly as an Enterprise JavaBean, the amount of new material we would have to absorb would probably seem overwhelming. Over the course of this book, however, we have introduced many of the changes needed to evolve our simple example application into an EJB. For example, we introduced the concept of a container in which application code is deployed beginning with servlets in Chapter 5. We introduced the separation of interface from implementation in Chapter 3, and specifically the use of remote interfaces in Chapter 15 (RMI). We've already made many of our classes Serializable, to facilitate ...