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.
Here are a few style guidelines for writing code:
public void foo() { log.info("foo"); }
And most importantly, take a look at some existing files, and be consistent!
You can find an Eclipse code format template in the SVN checkout (eclipse-code-formatter-profile.xml); apply it by going to the project's Properties -> Java Code Style -> Formatter -> Import.