title: Stop Eclipse/Java running multiple instances
body: <p>I'm not a java expert or a eclipse expert.
  Currently I'm working on a project and i need to debug/test often. I use the eclipse run Button for it. But when I don't close the Program eclipse/java opens it again(second window).
  It's an gui app with swing jframe.</p>
  
  <p>Is there a function in eclipse or java to terminate the previous build and opens the new one when you run it?</p>