title: How do I change the Java version of my "installed project facet" in Eclipse?
body: <p>I just installed Eclipse 3.7 and the Google Plugin for Eclipse because I want to teach myself how to use Google App Engine.</p>
  
  <p>When I create a new web application and run, I got an error that noted that annotations were not allowed in my JRE version (1.4). Hence, I set my JRE to 1.6 and my compiler compliance level to 1.6.</p>
  
  <p>However, I now get this new error.</p>
  
  <pre><code>Description Resource    Path    Location    Type
  Java compiler level does not match the version of the installed Java project facet.
  Myprojectname       Unknown Faceted Project Problem (Java Version Mismatch)
  </code></pre>
  
  <p>How do I change "the version of the installed Java project facet"?</p>
  
  <p>There is no item called "Project Facet" to the left of my project's properties menu.</p>