I created a template project that uses embedded jetty with SpringMVC.. This is one I came up with after trial and error embedding Jetty in a few different ways. I've always run into problems with JSP/JSTL. Anyways, this template started with the SpringMVC template project created by STS. It has a few additions that I always do, like logback instead of log4j, but that should matter much..
In its current form its basically a wrapper around a classic style web application. My main use for SpringMVC is bolting on a web interface to an existing application, so it will migrate that way in the next little while. Should still be useful.
If all you really want to do is make an executable jar out of an existing war you might want to checkout the tomcat7 plugin:
I make a example to redirect any request to port 8080 and redirect to a new location.
First "mvn package" and goto target folder to run "java -jar redirector.jar".