title: eclipse - export runnable jar file not working, running works
body: <p>I made a game with libGDX 1-2 years ago, I can run it from eclipse and it works.
  When I want to export the jar file, I go to export - runnable jar file - 
  Here I select package required libraries, and export it.</p>
  
  <p>When I open the jar file nothing will happen.
  <a href="https://i.stack.imgur.com/fWlWt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fWlWt.png" alt="enter image description here"></a></p>