Rating: 

This book is not intended for beginners but experts in the Java domain designing enterprise level systems or even maintaining them for system

performance and enhancements.

The book is well written and all the potential gotchas and the mistakes commonly done in application design and development are outlined with appropriate alternate solutions.

The book covers all aspects of java and ejb application development and their best practices.

Overall, this a good book to have and will be used by experienced java developers and the not so experienced.