If you ever do want to try out a new app server, what I do is use embedded Jetty. It's not an app server that you deploy your web app to, but rather your web a

If you ever do want to try out a new app server, what I do is use embedded Jetty. It's not an app server that you deploy your web app to, but rather your web app becomes a runnable application. This makes deployment to something like EC2 completely trivial. Just copy your app there and hit run.