In almost all examples on the home page, the imports are wrong.
It reads: "import wicket.xx.xx.xx" instead of "import org.apache.wicket.xx.xx.xx".
Please fix this, as otherwise everybody who copies the source code from your examples page gets an error.
In addition, the web.xml for the GuestBook example is not working at all.
It is not necessary to add a servlet mapping for the GuestBookApplication, it works very well without one.
The url-pattern is also misleading and does not match with the screenshot.