title: error while pushing an app to heroku
body: <p>I get an error while pushing my app from eclipse to heroku.</p>
  
  <p>it says 
   javac: invalid target release 1.7 </p>
  
  <p>how to rectify it</p>
  
  <p>this is my pom.xml plugin</p>
  
  <pre><code>                            &lt;plugin&gt;
              &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
              &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
              &lt;version&gt;2.3.2&lt;/version&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;
  </code></pre>