title: Eclipse IDE Shows Warnings On Project When None Exist
body: <p>I recently changed the JRE that one of my Java Projects use in Eclipse IDE from <code>JavaSE-1.8</code> to <code>JavaSE-11</code>. I restarted Eclipse. Now most of my Projects have warnings even though none of the files have warnings.</p>
  <p><a href="https://i.stack.imgur.com/1u6OZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1u6OZ.png" alt="enter image description here" /></a></p>
  <p>There also aren't any warnings in the build path libraries.
  I tried:</p>
  <ul>
  <li>refreshing Projects Explorer</li>
  <li>creating compile warning than removing it</li>
  <li>running project</li>
  <li>restarting Eclipse</li>
  </ul>
  <p>none have fixed the issue, all warnings remained.</p>
  <p>When I create a new Java Project, it also will have a warning on it. Hovering over the warning does not show anything.</p>
  <p>Though the Projects do run as normal, why are the warnings there and how can I remove them?</p>