Rating:  - very good book
Who is this book for?
1) Someone who is already familiar with the basics of distributed computing, like RMI or RPC (not strictly necessary but it helps a lot)
2) You can program in Java (J2SE).
3) You want to understand the overall distributed, multitier architecture supported by the J2EE platform. What the role of middleware is within this architecture. What an EJB is and how it fits into the overall picture. And most importantly, how to write the code for an EJB (starting from a simple hello world example).
This book is very good for understanding the big picture behind the J2EE platform. You'll know how it all works and how you can write and deploy server-side software components, aka EJBs. It will give you a solid foundation for understanding the basics so that you will be ready to tackle the more advanced topics. The book is well written. The ideas are clear, and diagrams are used extensively.
Rating: - good book
My first EJB book,simple to understand, good samples,good coverage.A must read ,especially for beginners.
Rating:  - This is a OK book
I was looking for an EJB 2.0 book. I was planning to buy either this one or Enterprise JavaBeans, 3rd Edition. So, I went to bookstore and read this one. (Explanation is ok, but it didn't cover the very simple and basic things, e.g. for CMP 2.0 about primary key stuff...this book has just assumed you've known what is cmp primary key before you read this book... If I don't remember it wrong, it didn't even mention about the primary key has to be either Object or String... So, I guess if you are not familiar with EJB 1.1, (like myself) you are gonna get confused... or may be just me.
But I did find the appendix was useful. So, I rate it "OK" with three stars... I guess I'm just a tough rate-er, I've never rated a book with 5 stars. I'm going to buy the O'Reilly one, cuz I didn't find it in bookstore. I hope it will be a good book...)
Rating: - This is a OK book
I was looking for an EJB 2.0 book. I was planning to buy either this one or Enterprise JavaBeans, 3rd Edition. So, I went to bookstore and read this one. (Explanation is ok, but it didn't cover the very simple and basic things, e.g. for CMP 2.0 about primary key stuff...this book has just assumed you've known what is cmp primary key before you read this book... If I don't remember it wrong, it didn't even mention about the primary key has to be either Object or String... So, I guess if you are familiar with EJB 1.1, (like myself) you are gonna get confused... or may be just me.
But I did find the appendix was useful. So, I rate it "OK" with three stars... I guess I'm just a tough rate-er, I've never rated a book with 5 stars. I'm going to buy the O'Reilly one, cuz I didn't find it in bookstore. I hope it will be a good book...)
Rating:  - Good introduction on EJB
One thing is that you won't become a master of EJB after you read this book. But you won't become a master of anything just after reading a book. :-)
The book provides in-depth introduction on EJB and related topics, such as different types of enterprise beans (Session/Entity/MessageDrivenBean), how EJBObject (EJB container) interacts with the actual bean object (strategies of intercepting the request and delegation), CMP and BMP, etc. The author did excellent job on these topics.
The author also tries to cover some advanced topics and best practices, sadly, this is where the book lost its shine. Except chapter 10 about transaction is good, the rest of the chapters are either too basic (e.g. lazy loading, aggregation vs. composition, wrap entity beans with session beans etc.) or too shallow (e.g. clustering) to provide any practical values. Some chapters, in my opinion, even are unnecessary (e.g. chapter 15 "Starting Your EJB Project on the Right Foot" and chapter 16 "Choosing an EJB Server") They are more or less related to the develop process instead of EJB.
One particular pitfall is that bean inheritance topic is not touched at all. Though EJB specs does not specify on this area, any serious EJB projects would inevitably touch/involve it. At least, the author should shed some lights on the best practices related to this topic.
Overall, as an introductory level book, it serves its purpose.
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