Vaadin with Scala

Hi All,

Can anyone give me a step by step instruction list or point me at a good resource on how to set up a scala class/application
and get it running on Tomcat. I have created a Vaadin 7 project, added the Scala nature to it and created a very simple class but I cant get it to run - I just get http status 404. Do I need a web deployment descriptor?

Many Thanks
Chris