title: Why doesn't my java compiler level match my installed project facet?
body: <p>I made a simple Java Google AppEngine application called Guestbook in Eclipse 3.7 and am trying to run it. However, I am encountering an error that lacks a quick fix:</p>
  
  <pre><code>Description Resource    Path    Location    Type
  Java compiler level does not match the version of the installed Java project facet.
  Guestbook       Unknown Faceted Project Problem (Java Version Mismatch)
  </code></pre>
  
  <p>I tried navigating to <i>Project | Properties</i> to change my project facet. However, I could not find a setting that dealt with "facet."</p>
  
  <p><img src="https://i.stack.imgur.com/2N4Mp.png" alt="enter image description here"></p>
  
  <p>What does "installed Java project facet" mean, and how do I fix this?</p>