You can find the full source code for this website in the Seam package in the directory /examples/wiki. It is licensed under the LGPL.
Sometimes, especially when you change JPA/Hibernate entities or mappings, we need to force the web application to redeploy manually. Just click the
hand pressing a button icon in the toolbar of the Seam perspective (The one with Change Timestamp of... as the tooltip).
Alternatively, edit the toplevel deployment descriptor (the application.xml file of an EAR, or web.xml file of a WAR).