title: How do I add a build.xml to an existing GWT project in Eclipse?
body: <p>I have a running Java GWT application, that I can compile using Eclipse.</p>
  
  <p>Now I wan't to also be able to build this application from the command line using ant.</p>
  
  <p>As of my understanding I therefore need a build.xml file.
  I used the <a href="http://code.google.com/webtoolkit/doc/1.6/RefCommandLineTools.html#webAppCreator" rel="noreferrer">webAppCreator tool</a>, that comes with the SDK to create this build.xml file and adapted it to my needs and got it working.</p>
  
  <p>But how do I tell Eclipse now to automatically update the build.xml file upon code changes?</p>
  
  <p>I know it is possible for it works in projects created with webAppCreator. But I just copied the build.xml to another project. So what do I need to adapt? Or where do I need to set up the link to the build.xml?</p>