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Title: Could be a "must have", but...
Review: I wish the author spent more time on the quality of the book and its contents, as opposed to just getting it out the door for JavaOne. I found it really annoying when I downloaded the errata of the book, it needed an errata itself too....Even if you only want to learn the reference implementation (which is what most of the book is all about), you'll have to compile/deploy the examples by trial-and-error. Correction for most of the technical errors have not made it to the errata either.
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