Settings interface for application settings.
internalErrorPage - You can override this with your own page class to display internal errors in a different way.
pageExpiredErrorPage - You can override this with your own bookmarkable page class to display expired page errors in a different way. You can set property homePageRenderStrategy to choose from different ways the home page url shows up in your browser.
A Converter Factory - By overriding getConverterFactory(), you can provide your own factory which creates locale sensitive Converter instances.
@author Jonathan Locke