Minor Description
WicketSessionFilter currently only sets the Session ThreadLocal, but not the Application ThreadLocale.
This leads to WicketRuntimeException when trying to get the Application using Application#get or Session#getApplication.
It would be handy if the Application ThreadLocal would also be set in WicketSessionFilter.
see also:
http://old.nabble.com/Application-get-in-WicketSessionFilter-ts27862681.html#a27862681