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Java Data Objects Review by J. David Beutel
good introduction to JDO
I just started using JDO. This book was a good introduction. Altho it lacks some of the details of the specification, it was much easier to understand. At just over 200 pages of text, it was easy to read cover to cover.
Some books elaborate beyond their relevant specification, e.g., The Java Class Libraries series. That's fine for a reference book, but I wouldn't want to read the whole thing all at once. Robin Roos' book abstracts some of the complexity from JDO to explain it in a way that I think a lot of people will find easier to understand.
Coming from a JDBC and home-grown persistence layer background, I can appreciate how complex the issues are. So I was impressed with how simple Robin's explanations were. I doubt it will be the last JDO book that I buy, but I'm glad that it was the first.
This book is not a big comparison of the major persistence layer technology choices today, nor an analysis of the application of JDO to a major project. If you're trying to evaluate JDO against the other technologies, then you'll need to look at the online debates. But if you want to try JDO for yourself, then this is a good start.