ISBN: 1861005083

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Reviews : Java Books :
Professional EJB : The EJB 2.0 Entity Model

What does this book cover?

The fundamentals of EJB development, including session beans, entity beans (BMP and CMP), and message-driven beans EJB services such as resource management, transactions, and security Designing EJB applications using patterns, strategies, and UML Improving EJB design through testing and performance Integrating EJBs with J2EE, COM, and CORBA Deployment instructions for leading application servers

Book overview

Enterprise JavaBeans (EJB) are a container-based component architecture that allow you to easily create secure, scalable and transactional enterprise applications. Developed as session beans, entity beans, or message-driven beans, EJBs are the critical business objects in any J2EE application.

Professional EJB shows how to develop and deploy EJB applications using both the 1.1 and the new 2.0 specification. The addition of container-provided services, such as container-managed persistence, and security and transaction management, are covered in detail. As well as implementation details, the book also provides a number of strategies and patterns that can be applied when designing your EJB applications. Subsequently, it also suggests steps for taking existing EJBs and improving their performance.

Finally, the book recognizes that one of the most difficult areas of EJB development is the deployment process. Thus it demonstrates how to deploy your EJB applications to some of the leading EJB containers including BEA WebLogic, IBM WebSphere and Sybase EAServer.

Who is this book for?

Professional EJB is for professional Java developers who wish to build secure, scalable and transactional components. No knowledge of EJB is required, but a good knowledge of the Java programming language, and some familiarity with its server side aspects would be an advantage.

Introduction
The EJB 2.0 Entity Model
Container-Managed Persistence Comparison
The Bean-Managed Persistence Alternative
Problems with the EJB 1.1 CMP Model
EJB 2.0 Solutions
EJB 2.0 Container-Managed Persistence
Abstract Methods in EJB 2.0 CMP: Abstract Methods and Relationships; Abstract ejbSelect() Methods

Part 2

Local and Remote Client Views of the Object Model: Local Interfaces, Remote Interfaces, and the Client View; Local Interfaces, Remote Interfaces, and the Client View (Cont.)
How Relationships are Represented: Relationship Descriptions; Relationship Collection Classes

Part 3

The EJB 2.0 Query Language
The Structure of the Deployment Descriptor
Section Summary

Part 4

EJB 2.0 Changes to Bean-Managed Persistence

Rules for Using Home Interface Business Methods

The Database Table

Summary

The EJB 2.0 Entity Model

The 2.0 version of the specification for Enterprise JavaBeans introduces important improvements to the bean-managed and container-managed models for entity persistence. Programmers writing entities with bean-managed persistence (BMP) may benefit from the addition of local interfaces and home-interface methods to the specification. Programmers writing entities with container-managed persistence (CMP) can choose to take advantage of an entirely new CMP model.

This new EJB 2.0 persistence model is not just a fine-tuning of features that were available in the EJB 1.1 specification. Instead, EJB 2.0 persistence is a revolutionary addition of a standards-based object- relational mapping framework to Enterprise JavaBeans technology. This chapter will concentrate on the new CMP persistence model, although it will also give an example of the new features available to entities using BMP persistence.

Some of the important points we will be covering in this chapter include:

The differences between EJB 1.1 CMP and EJB 2.0 CMP
Abstract methods and their role in EJB 2.0 CMP
Local interfaces, relationships, and the client view
The representation of relationships between entities
The EJB 2.0 query language
Home interface methods

As the changes the entity beans are so significant, this chapter will primarily provide an overview of the EJB 2.0 persistence model, and then look at BMP entities under the new specification. In the next chapter we will drill down in the 2.0 CMP model in greater depth.

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