title: How does Maven know where to find Java 1.5
body: <p>In <code>pom.xml</code> you can:</p>
  
  <pre><code>&lt;build&gt;
      &lt;plugins&gt;
          &lt;plugin&gt;
              &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
              &lt;configuration&gt;
                  &lt;source&gt;1.5&lt;/source&gt;
                  &lt;target&gt;1.5&lt;/target&gt;
              &lt;/configuration&gt;
          &lt;/plugin&gt;
      &lt;/plugins&gt;
  &lt;/build&gt;
  </code></pre>
  
  <p>How does Maven know where I have 1.5 version?</p>