I just want to run a simple app using superDevMode to know its benefits. The CodeServer is getting started successfully, but it is complaining there is no gwt modules to com
there is a really good explanation on how this works here: http://blog.ltgt.net/how-does-gwts-super-dev-mode-work/
you need to drag the booklets into your browser. Then start your application like normal. Open your app in the browser without the "?gwt.codesvr=127.0.0.1:9997" part. Now you can use the booklets to start the SuperDevMode.
Hope this helps.