title: warning: [options] bootstrap class path not set in conjunction with -source 1.5
body: <p>I get the warning message at Build time!</p>
  
  <blockquote>
    <p>warning: [options] bootstrap class path not set in conjunction with
    -source 1.5</p>
  </blockquote>
  
  <p>How can I fix it?</p>