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Using and Understanding Java Data Objects
by David Ezzio

1 edition
June 2003
456 pages

Reviewed by Ernest Friedman-Hill, January 2004
  (6 of 10)

This book is loosely divided into three parts: a conceptual overview, an API tour, and some application case studies. The overview is dense and would be scary for someone new to persistence.

The API section is the largest. One chapter is devoted to each key JDO interface. These chapters read like heavily annotated Javadocs; the subheads roughly correspond to the interface methods. Each chapter is accompanied by a UML diagram of a single class; a listing would be more useful.

The case studies are the best part of the book. Each is filled with practical advice for using JDO in a particular environment (servlets, EJBs, Swing). This material could save you countless hours of frustration.

One thing this book lacks is code. When code does appear, it's an Ant build file, or a class showing how to use the "transient" keyword, or something else peripheral to the main topic. There is essentially no real JDO code at all until the case studies at the end of the book.

Also noticeably missing is an introductory tutorial. There's no "Hello, JDO" program here. Many programmers want to see a basic program like this; its absence is disappointing.

This would make a good second book on JDO -- a reference you could turn to for details after you already knew your way around. You may also want a book with more code and tutorial content, and the writing is rough, but the case studies are full of great advice.

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