title: Launching standalone editor with "F3" key in eclipse
body: <p>I use "F3" key of eclipse for invoking the definition of class, method, or anything. </p>
  
  <p><img src="https://i.stack.imgur.com/yWqac.png" alt="enter image description here"></p>
  
  <p>When I click "F3" key on some class, instead of opening the class in eclipse, it opens the java file that contains the class.</p>
  
  <p><img src="https://i.stack.imgur.com/FFKhW.png" alt="enter image description here"></p>
  
  <p>What's wrong with my setup in eclipse? </p>