title: Eclipse chokes on enum, even though Compiler compliance level is 1.6
body: <p>I have set my Eclipse project's <code>Compiler compliance level</code> to 1.6</p>
  
  <p>But I get errors like in the screenshot below: <code>Syntax error, annotations are only available if source level is 1.5</code>.</p>
  
  <p>I have refreshed/cleaned/restarted Eclipse at least 10 times.<br>
  It compiles fine with Maven2. The Eclipse project has been generated by Maven2.<br>
  The project uses java-6-openjdk</p>
  
  <p><img src="https://i.stack.imgur.com/YNi3N.png" alt="enter image description here"></p>