Java Data Objects

I was expecting something better from the JSR lead for JDO. Before you buy this book, go to oreilly website for this book and go through the Chapter 1 available online. That chapter could have been fit in half as many pages without loss of information. Now refer to the errata and README available on the oreilly website, download the JDO reference implementation and see if you can run the examples. The examples don't work even if you follow the directions from the errata and README. By now you would have wasted a few valuable hours. If the Chapter 1 "An Initial Tour" is a waste of time, there is no reason to expect something better in the rest of the book. So the books sucks, but you want to learn JDO! What can you do? Download an evaluation edition of Kodo JDO from Solarmetric. Install it and you will get a JDO Developers Guide. Go through that. It is significantly better than this book. While you are at it, you can play with Kodo and get a feel for a real implementation of JDO, rather than Sun's reference implementation.