On page 526, the workbook states that the downloadable example code is available from:
http://examples.oreilly.com/entjbeans5
This URL actually produces a File Not Found from the OReilly server.
Navigating from the top level of http://examples.oreilly.com took me to the home page for the book at http://www.oreilly.com/catalog/entjbeans5/ and hence on to the download location on Sourceforge:
http://sourceforge.net/project/showfiles.php?group_id=22866&package_id=187246
The page referenced in the manual should either redirect to this Sourceforge page or contain the link to this working download page.
This URL has been fixed to redirect to http://www.oreilly.com/catalog/entjbeans5/.