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Enterprise JavaBeans: Understanding Session Beans

Nov 29, 2002

📄 Contents

␡

What Is Conversational State?
What Are Session Beans?
Session Bean Files
Characteristics of Session Beans
Types of Session Beans
Session Bean Methods
Life Cycle of Session Beans
Comparing Stateless and Stateful Session Beans
Best Practices
Summary
Q&A
Quiz
Exercises

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Session Bean Files

Like other enterprise beans, a session bean consists of the home interface, the component interface, the bean class, and the deployment descriptor.

The home interface is either a remote home interface or local home interface. A remote home interface extends the javax.ejb.EJBHome interface, whereas a local home interface extends javax.ejb.EJBLocalObject. The home interface is used as the bean factory. The client uses the home interface to manage the life cycle of the session bean.
The component interface is either a remote interface or a local interface. The remote interface extends the javax.ejb.EJBObjectinterface and the local interface extends the javax.ejb.EJBLocalObject interface. The component interface defines all the methods that are callable by the client.
The bean class implements the javax.ejb.SessionBean interface. In addition, it implements all business methods listed in the remote interface.
The deployment descriptors define the session bean type, transaction, security, and run-time properties.

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