title: Spring tool suite java perspective shows blank
body: <p>This keeps happening to me very often these days. </p>
  
  <p>I can't see any of my classes in my <kbd><strong>Java perspective</strong></kbd> unless I change perspective to say debug/spring. The workspace is completely gray. When I do <code>window --&gt;show view --&gt; package explorer</code>, nothing shows up either. </p>
  
  <p>I have no clue what is causing this. I would really appreciate your help here.</p>
  
  <p>Screenshot attached.</p>
  
  <p><img src="https://i.stack.imgur.com/MNZl2.png" alt="enter image description here"></p>