Possibly starting out as a "language" book versus a tool book.I'm finally beginning to understand AOP...Since my last attempt to get a book to learn about AspectJ wasn't very productive, I decided to try again with Eclipse AspectJ: Aspect-Oriented Programming with AspectJ and the Eclipse AspectJ Development Tools by Adrian Colyer, Andy Clement, George Harley, and Matthew Webster. Content: Part 1 - Introducing Eclipse, AspectJ, and AJDT: Getting Started; First Steps in AJDT; Extending The Application; More AJDT Part 2 - The AspectJ Language: An Overview Of AspectJ; Straight To The Point; Take My Advice; Inter-Type Declarations; Aspects; Using The AspectJ API Part 3 - Putting It All Together: Adopting AspectJ; Advanced AJDT; Aspect-Oriented Design; Command-Line AspectJ; AspectJ Language Quick Reference; Next Steps; AJDT Icons Reference; Index To give you an idea of how much better I liked this book... I'd definitely recommend this book for anyone wanting to delve into this area...Good Overall View of the Language and PotentialSub-Title: Aspect-Oriented Programming with AspectJ and the Eclipse AspectJ Development Tools If nothing else, the Java community is absolutely wonderful in coming up with new variations, add-ons, even concepts. I still haven't decided if I am going to actually do anything in AspectJ, but it seems to be gathering more attention. Finally in the last part of the book, called appropriately 'Putting It All Together' the book discusses the actual process to go through to begin adopting the language. On the other hand, in a fairly short while you can grasp the AspectJ language and begin thinking about it's usefulness for your project.Everything about AspectJ that you didn't know to askIn Part 1, "Introducing Eclipse, AspectJ and AJDT", we are led through the building of a prototype insurance application (SimpleInsurance). Along the way, we are introduced to Eclipse, the AspectJ language and the AspectJ Development Tools (AJDT). In Part 2, "The AspectJ Language", things calm down as we go back to the beginning and cover the AspectJ language in full detail. I couldn't help comparing this book to "AspectJ In Action", though the two are quite different in many ways. "Eclipse AspectJ" definitely contains the most in-depth information about AspectJ and the AJDT. Where "AspectJ In Action" spent some time explaining different patterns and showing where different aspects should be used and where they should not, "Eclipse AspectJ" presents the tools but leaves the rest up to us. While "Eclipse AspectJ" cannot be matched for sheer depth, it does not always provide enough context to be used by new AspectJ developers. It is a good resource for existing AspectJ developers and will give you a complete understanding of the language and the tooling, but will be standing beside "AspectJ In Action" on my bookshelf.