The web site for this book, www.oreilly.com/catalog/hibernate, offers some important materials you'll want to know about. All the examples for this book can be found there, organized by chapter.
The examples are available as a ZIP archive and a compressed TAR archive.
In many cases, the same files are used throughout a series of chapters, and they evolve to include new features and capabilities from example to example. Each chapter folder in the downloadable archive contains a snapshot of the state of the example system, reflecting all the changes and new content introduced in that chapter.