The Open Source Zone

This book is an excellent resource for learning AspectJ. It is perfectly organized to take you from beginner, novice, to expert as you move through each of the chapters, just as you might expect if you were taking a class in AspectJ.

The author's presentation of the material is straightforward and easy to follow, and his examples are not too involved that you lose track of what's going on. Furthermore, the author has an excellent grasp of the language and is really able to show off the power AspectJ has to offer.

What I really appreciate about the book is that he focuses not just on coding, but also on design; I'm a software engineer and am very pleased that the author discusses an aspect as something to be used elegantly, as part of a well-designed system, rather than just another tool that can be abused. He even discusses several new design patterns that AspectJ makes possible.

I truly recommend this book!

I loved this book, first of all the introduction is the most interesting presentation of AOP that I ever read.

The other chapters are very good too since based on use-cases very easy to reproduce on projects...

A book to have is you want to learn abour AOP (even if not interested by AspectJ per se...)

AspectJ In Action is a great book to use as an introduction to Aspect-oriented Programming. However, AOP is not for developers to whom Java and OO are still new. Without a comfortable understanding of classes, polymorphism, and encapsulation AOP will only further confuse things.

With that said, AspectJ In Action is a wonderful book filled with plenty of examples and explanations about the well-lit areas of AOP as well as many of the dark corners. I enjoyed reading this book because it starts out with the fundamentals and works its way to more and more complex uses of AOP without getting bogged down in language tangents. Also, the direct application of AOP in real Java design areas is very helpful in getting a better feel for when and how AOP can be applied.

I am looking forward to Ramnivas Laddad's next book!

I met the author of this book this weekend, and saw him give a presentation on this material. Finally, a book that shows real uses for AOP.
I have been watching AspectJ since I first saw it about a year ago. My first impression was that it was 'cool', but was worried about giving developers more rope with which to hang themselves. Yes, it was cool, but the most practical examples you would see in demos were thing like 'logging'. I was worried that it would just lead more more ways for junior engineers to 'convolute the code', without bringing much benefit for that risk.
The material in this book, ALONG WITH the support the author had from the Eclipse IDE changed my mind. Finally, there were some real examples involving transaction support, JAAS, exception handling, and more. Furthermore, he addressed these topics in the real-world sense of refactoring existing code to prove his points.
If you aren't using an IDE that gives you some support, then I still have my concerns about 'convoluting' your code; but I am more convinced than ever that AOP concepts are worth putting into my mental toolkit. I have no doubt that the way aspects 'inject' behavior into code will reduce our development time, and make our code behave more consistently (no errors because of inconsistencies in the way common things are handled). If you can add one more ball to the things you 'mentally juggle' while developing, add AOP concepts. This book will help.

I have got this book at local Austin Java User Group meeting. First impression: different cover. Most of Manning books are either greenish or almost black-and-white. This one is yellow.<p>Part 1 provides really good introduction into AOP. This is the first book I have read on AOP; all stuff I have seen before was online or magazine articles. One interesting fact is that this book took a while to consume, compared to the usual two-week cycle I have for technical books. I guess the reason is that the book has more substance than most of the techincal books and Mannigs does not try to pad their books with API references and other stuff that can be easily found online. After the chapter goes through AOP concepts, it explains AspectJ in application to those concepts. Basic syntax as well as some advanced techniques are explained.<p>Part 2 has examples of basic applications of AspectJ. Of course it starts with the mandatory logging implemented using AOP. Not a very good example in general, since logging is not really a cross-cutting concern, but works for illustration purposes. Other two application areas discussed in this part are implementation policy enforcement and optimization (pooling and caching examples). Policy enorcement part is really interesting, especially if you are into call patterns.<p>In general, every part follows the same pattern: first the author discusses the conventional approach, then explains challenges of the conventional solution, provides AspectJ-based solution, and gives one or two examples. Very clean language, easy to follow.<p>Part 3 discusses advanced applications of AspectJ. First it delves into design patterns and idioms of AOP; it's not by any means AspectJ-specific, so would be useful for any AOP implementation. Examples of patterns are providing thread-safe implementations using AspectJ, implementing security (very interesting discussion on JAAS), transaction management, and implementing business rules using AspectJ. The part ends with AspectJ usage in different development phases.<p>Two appendices: description of AspectJ compiler and Ant integration - only 15 pages for both. Useful as a reference.<p>Overall impression: an excellent book. Definitely worth reading, even if you are not into AOP yet.