Chapter 1. EJB Overview

Identify the use, benefits, and characteristics of Enterprise JavaBeans technology, for version 2.0 of the EJB specification.


Enterprise JavaBeans architecture is the standard component architecture for building distributed object-oriented business applications.

Enterprise JavaBeans architecture makes it possible to build distributed applications by combining components developed using tools from different vendors.

Application developers do not have to understand low-level transaction and state management details, multi-threading, connection pooling, and other complex low-level APIs.

Enterprise JavaBeans applications follow the Write Once, Run Anywhere™ philosophy of the Java programming language.

The Enterprise JavaBeans architecture addresses the development, deployment, and runtime aspects of an enterprise application’s life cycle.

Enterprise JavaBeans architecture defines the contracts that enable tools from multiple vendors to develop and deploy components

Enterprise JavaBeans architecture is compatible with the CORBA protocols. This allows remote invocations on session and entity beans from J2EE components that are deployed in products from different vendors.


Defines the integration of EJB with the Java Message Service. Introduces message-driven beans (MDB) - a stateless components that are invoked by the container as a result of the arrival of a JMS message (MDB does not have home/home-local or remote/local interfaces).

Provides a local client view and support for efficient, lightweight access to enterprise beans from local clients.

Provides improved support for the persistence of entity beans.

Provides improved support for the management of relationships among entity beans (Local CMP Beans only).

Provides a query syntax (EJB QL) for entity bean finder and select methods (CMP only).

Provides support for additional methods in the home interface (business logic methods via ejbHome<MethodName>().

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