Instruct: Classify the given review as either positive or negative.
Query: Extremely disappointing

I was extremely disappointed by this book. I thought it was a book about how to architect Java applications. It is not. While I appreciate the book's goal of providing practical examples, it is nothing but an example of building one particular application. It's not much more than a tutorial. I want a book of principles, guidelines, best practices for building Java applications - a series of general principles that I can apply to any situation. O'Reilly books are normally great; I bought this book largely because it was from O'Reilly. Big mistake. If you want a book of general principles for how to design a Java enterprise app, Core J2EE Patterns is excellent and much better than this one.