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This new book presents concise and complete coverage of Java Persistence API 2.0, the latest Java technology on persisting Java objects to relational databases. JPA 2.0 is part of Java EE 6.0 standards, but can be used in both Java SE and Java EE applications. This is a new Java persistence standard based on object-relational mapping and utilizing object-oriented features of Java. It is expected to gradually replace JDBC and proprietary object-relational mapping frameworks/libraries for most Java applications with database access. JPA makes software development fun and leads to improved productivity.The book introduces concepts, techniques, and application trade-offs in a manner that is easy to understand and provides many code examples for an online book ordering system. The Java source code and database DDL are freely downloadable from the author%u2019s web site. The book contains instructions on how to run the code examples so that the reader can easily learn the concepts through running the code. The book is suitable for Java developers and architects who want to learn this new and standard technology, but have no prior knowledge of JPA. This book is also aimed at experienced JPA developers who may use this book as a reference, by providing complete coverage of JPA 2.0. It has a special chapter on JPA design patterns and performance tuning. This book will prove to be valuable for novice and experienced JPA developers.