This book is for Java developers who want to use JBoss on their projects. If you're new to J2EE, this book will serve as a gentle introduction. But don't mistake this book for a true J2EE reference manual. There is a reason those books are 1,000+ pages longthey cover each technology in exhaustive detail. This book gives you enough to get a simple example up and running quickly.
If you've worked on J2EE projects but are new to JBoss, this book covers familiar concepts, introduces you to key J2EE 1.4 issues including Web Services, and shows you how to make them work with JBoss. If you've worked with JBoss before, this book will get you up to speed on JBoss 4, JBoss WS (Web Services), and Hibernate 3.