AppFoundation in Vaadin7 (without web.xml)

I’m still new in Vaadin and Java Servlets.
I’d like to test and possibly use the AppFoundation add-on, I found it great.
It is clear to me how to create a project using AppFoundation in Vaadin 6.
In Vaadin 7 there is no web.xml and I’m not good enoght to understand how to set-up AppFoundation without it.
Can anybody give me a hint?