I'd like to thank Packt Publishing for giving me this unique opportunity to write a book about a great product like JBoss. All the staff I have worked with has been very cooperative at giving their time in the arduous publishing process. I'd also like to thank the external reviewers Peter Johnson and Edem Morny who have offered their professional expertise for many parts of this book. And last but not the least, I want to pay my tribute to my family, my father in particular who has transmitted me the virus of programming when I was just a boy, my wife Linda who was so patient with my late nights and with my missing housework, and my 2 years old baby Alessandro who hasn't actually helped in writing this book but has been the inspiration of it.