title: Modify existing GWT application
body: <p>I have a WAR file of some GWT application. No source project.
  I need to do some modifications in this application like adding new buttons to the actionbar etc.</p>
  
  <p>I've unrared WAR file and inside WEB-INF/classes there are .classes and .java files as well.
  So the source code of Java classes is available.
  JavaScript files under deferredjs folder are obfuscated.</p>
  
  <p>Sadly I'm not a GWT expert.
  So the question is: is it possible to modify existing GWT application having WAR with .java files?
  And how to do it?</p>
  
  <p>Thanks.</p>