<pre>Author/s : David Jordan and Craig Russell Publisher : O'Reilly Category :Miscellaneous Java Review by : Chris Mathews Rating : 8 horseshoes</pre> The first thing to note about this book, is that it was written by David Jordan and Craig Russell, who happen to be key members of the JDO Expert Group (Craig was also the Specification Lead). This obviously built up my expectations for the book and I am happy to say that I was not disappointed. This book does a great job explaining JDO in a vendor independent and portable manner. The first few chapters provide a high level overview of the JDO API and Architecture, read these if you just want to know what all the hype is about. The rest of the book is dedicated to describing all aspects of JDO in detail and clearly explaining how to apply them. JDO concepts are demonstrated throughout with the use of a single problem domain, which makes the numerous code examples flow easily and consistently. My only major complaint deals with the final two chapters of the book, which focus on how to use JDO in application server environments. They are easily the weakest chapters of the book. I found myself questioning much of the advice given in these chapters and some of the terminology used was outdated. Ultimately, I feel that this book would have been better served without the final two chapters. Despite some minor flaws, I would consider Java Data Objects is the definitive book on JDO. Anyone that is interested in JDO shouldn't miss this book.
<pre> Review by : Ernest J Friedman-Hill Rating : 8 horseshoes </pre> Java Data Objects is simple and straightforward, and solves a real problem in an elegant way. Conveniently, this also serves as a description of this enjoyable book from some of the key JDO specification team members. JDO is a recently standardized API for transparent object persistence. A standalone reference implementation is available, as are quite a few commercial and open-source versions that piggyback on relational databases and other storage solutions. JDO's popularity is growing rapidly because of its simplicity, ease of use, and scalability. "Java Data Objects" is a timely and practical treatment of this new API. After a clear and accessible overview, this book first presents JDO in a tutorial style using a simple but nontrivial example application. Later chapters fill in the details where needed: for instance, a whole chapter is dedicated to the difficult topic of object identity. The motivations behind JDO's development are explained well, and comparisons to other object-persistence solutions, including EJB container-managed persistence, are fair and balanced. One of this book's few flaws is that despite the authors' important roles on the standards committee, the rationale behind some of JDO's more puzzling properties are left unexplained. In particular, JDO requires that only a small subset of the standard Collections be supported by a JDO implementation, but this book doesn't explain how this subset was chosen. All in all, an excellent tutorial and reference that will have you up and running with JDO in no time.