title: Why the class give bytecode version warning
body: <p>When ı open the class , i am getting this warning.
  I have no idea what it is should i download the source ?
  The class doing the scanning for the barcode</p>
  <p><a href="https://i.stack.imgur.com/xrRaO.jpg" rel="nofollow noreferrer">warning</a></p>