As others have already mentioned, there is an utter dearth of documentation out there about Spring Web Services, a technology which, in my opinion, should be a very rich environment for documentation and texts. As such, this book gets an extra star for simply existing.
The problem with this book is that there are too many things which are just plain missing. For starters, while there aren't errors of gross negligence (it was clearly run through a spellchecker so that there aren't blatantly misspelled words), there are sentences which are incomplete and that makes the material hard to comprehend.
However, to me, the bigger issue is that the "recipes" which are included seem to be missing instructions. Not the kind of omissions like forgetting to include the eggs in a recipe for brownies, more like failing to mention that you need to grease the pan first. Put another way, it's as if the authors have made the assumption that any developer using this reference will automatically infer the items that have failed to be documented.
Purchase the book and use, but beware that it might not offer the quick start that you have come to expect from other reference books on the market today.