Instruct: Classify a given Amazon review as either positive or negative.
Query: Superb book for Persistence Layer

This book is simply superb. It leads a reader thro insights on how a persistence layer truly needs to be designed and perform when encountered with a foray of relational databases and the Object-Oriented Java programming language. I have been used to EJBs for many years and Hibernate has been a welcome change. The book explains how easily a simple POJO (Plain Old Java Object) can be extended to a transactional class. There's clarity, simplicity and ground-up coverage of the persistence layer - Hibernate. I am recommending the use of Hibernate in my work place, and this book has influenced the decision. I am glad Sun Microsystems' EJB 3.0 specification leverages on Hibernate.