1 Understanding Enterprise JavaBeans

The Java 2 Enterprise Edition(J2EE) Enterprise JavaBeans (EJB) are a component architecture that you use to develop and deploy object-oriented, distributed, enterprise-scale applications. An application written according to the Enterprise JavaBeans architecture is scalable, transactional, and secure. The component types that you can create are commonly referred to as Enterprise JavaBeans.

This chapter describes the following:

• What are Enterprise JavaBeans?

• What is a Session Bean?

• What is an EJB 3.0 Entity?

• What is an EJB 2.1 Entity Bean?

• What is a Message-Driven Bean?

• Which Type of EJB Should You Use?