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AppFuse uses Spring for its dependency injection capabilities, as well as because it simplifies Java EE development and testing. To learn more about Spring and how it works, please read Introduction to the Spring Framework by Rod Johnson. If you have Spring experience, but haven't worked with Spring 2.0, you'll want to read Spring 2.0: What's New and Why it Matters by Rod Johnson. For a condensed version, see What's New in Spring 2.0 from Spring's documentation.
There are a number of books written on Spring. The best ones are Spring Live, Spring in Action and Pro Spring. Spring in Action is currently being updated for Spring 2.0. If you're interested in the history of Spring more so than how to develop with it, you'll want to read J2EE Design and Development by Rod Johnson.
Useful Spring documentation:
Spring Live was written by Matt Raible, AppFuse's founder. This book was written for Java developers with some web development experience. If that fits your profile, there's a good chance you'll enjoy this book. Chapter 2 is available as a free download.