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I'm having trouble deploying a Vaadin 7 app to GAE. I followed the instructions given here, but when deploying, I get an Error: NOT_FOUND in browser at myprojectid.appspot.com. If I modify the project's web.xml settings and map a servlet to the main UI class, I get another error in my browser which is: 500 Server Error: The server encountered an error and could not complete your request. How can I get my Vaadin 7 project to run on GAE?