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The book starts with a chapter that explains distributed objects, components, server-side components, and transaction monitors in a way that makes total sense and is fun to read.
The next couple of chapters give you an in-depth look at the EJB architecture removing all the mystery from the technology -- these chapters are pure gold.
Chapters 3 through 7 show how to develop stateless, stateful, CMP and BMP entity beans. These chapters explain how to write beans and how to use them. The examples are very excellent.
Chapter 8 is a very long but necessary chapter on transactions and how they work in EJB. I'm glad they saved this for after Chapters 3 -7 because it's complicated.
Chapter 9 is a priceless Design Strategies chapter that gives you more punch in the first 10 pages then most books give in 100. Even experienced EJB developers will learn new tricks from this chapter.
Chapter 10 is on XML deployment descriptors. This is an excellent reference and the way its organized makes it much simpler to understand.
Chapter 11 covers J2EE. It's short but excellent. The author tells you exactly how EJB fits into J2EE, which is all I wanted to know.
Appendix A - D are an invaluable reference for developers. They include a complete class reference, UML state diagrams and charts, vendor listing and finally a summary of the changes from EJB 1.0 to EJB 1.1.
This is the best EJB book available and will continue to be the best for a long time. Its too solid and too well organized not to be.
The first three chapters of the book explain the purpose, architecture, and implementation of EJB servers. This really helps our people to understand what was going on under the hood and why beans behave the way they do. Without this material, EJB would be a mysterious black box. We now understand EJB at it lowest levels, which makes our people more productive.
The rest of the book provides a detailed explanation of how to develop each kind of bean (stateless, stateful, and entity beans) using an example application. As the book proceeds it builds on the example increasing the complexity incrementally. What's especially appealing is that example is not so large that it's distracting. The book is very focused and the examples add rather then detract from the book.
One of the books greatest strengths is the way it covers Enterprise JavaBeans in detail. Chapter 8, for example, goes into detail about transactions, database locking, isolation levels, and how transactions are propagated. In addition, the same chapter explains how exceptions impact transactions -- a very real issue when developing large-scale projects.
There is also a great chapter on "design strategies" which introduces ideas like the business interface and bulk accessors. While these designs strategies are invaluable to our project, we would like to see a lot more of them. In particular a section on design patterns in EJB would be very helpful. Hopefully this kind of material will be added in a future edition.
EJB is fairly complex, so a good book like this one is a gold mine. We now have about 20 developers working on our EJB project. Every time we add a developer to our project, they are handed a new copy of this book and told to read it. Without out this book most of our new developers would be hopelessly lost. If you are going to use EJB in your project, then you absolutely must have this book -- its essential.
