title: "Faceted Project Problem (Java Version Mismatch)" error message
body: <p>Eclipse's "problems" tab is displaying this error:</p>
  
  <blockquote>
    <p>Description: Java compiler level does not match the version of the installed Java project facet.<br>
    Resource: groupping<br>
    Path: [blank]<br>
    Location: Unknown<br>
    Type: Faceted Project Problem (Java Version Mismatch)</p>
  </blockquote>
  
  <p>My <code>pom.xml</code> has this setting:</p>
  
  <pre><code>&lt;plugins&gt;
      &lt;plugin&gt;
          &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
          &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
          &lt;configuration&gt;
              &lt;source&gt;1.6&lt;/source&gt;
              &lt;target&gt;1.6&lt;/target&gt;
          &lt;/configuration&gt;
      &lt;/plugin&gt;
  &lt;/plugins&gt;
  </code></pre>
  
  <p>Where else could the settings be mismatched?</p>