Spring 2.5 Aspect-Oriented Programming by Massimiliano Dessì, is the first and unique book (332 pages) totally dedicated to Spring AOP, it was recently published by Packt Publishing.
Massimiliano Dessì works as Software Architect and Engineer for Sourcesense, who started developing JEE applications in 2000. In 2004 he discovered the Spring Framework 1.0, and since then he has been one of its most enthusiastic users.
This book is dedicated to developers that works every day on J2EE applications and they would like to know more about Aspect-Oriented Programming (AOP) and Spring AOP. I think that this book can be considered as a deep methodological documentation for Spring AOP.