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Enterprise Beans

Dale Green

Enterprise beans are the J2EE components that implement Enterprise JavaBeans (EJB) technology. Enterprise beans run in the EJB container, a runtime environment within the J2EE server (see Figure 1-5). Although transparent to the application developer, the EJB container provides system-level services such as transactions to its enterprise beans. These services enable you to quickly build and deploy enterprise beans, which form the core of transactional J2EE applications.

In This Chapter

What Is an Enterprise Bean?

Benefits of Enterprise Beans

When to Use Enterprise Beans

Types of Enterprise Beans

What Is a Session Bean?

State Management Modes

When to Use Session Beans

What Is an Entity Bean?

What Makes Entity Beans Different from Session Beans?

Container-Managed Persistence

When to Use Entity Beans

What Is a Message-Driven Bean?

What Makes Message-Driven Beans Different from Session and Entity Beans?

When to Use Message-Driven Beans

Defining Client Access with Interfaces

Remote Access

Local Access

Local Interfaces and Container-Managed Relationships

Deciding on Remote or Local Access

Performance and Access

Method Parameters and Access

The Contents of an Enterprise Bean

Naming Conventions for Enterprise Beans

The Life Cycles of Enterprise Beans

The Life Cycle of a Stateful Session Bean

The Life Cycle of a Stateless Session Bean

The Life Cycle of an Entity Bean

The Life Cycle of a Message-Driven Bean

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