title: JDT weaving is currently disabled
body: <p>I just installed Eclipse standard 4.4 Luna, and after installing the Scala IDE and friends I get</p>
  
  <pre><code>JDT Weaving is currently disabled. The Scala IDE needs JDT Weaving to be active,
  or it will not work correctly. 
  
  Activate JDT Weaving and Restart Eclipse? (Highly Recommended)
  
  [OK] [Cancel]
  </code></pre>
  
  <p>Does anyone know how to do this?</p>
  
  <p>Now my comments on this error message</p>
  
  <ul>
  <li>In general error messages that tell you what to do, but not how to do it are frustrating.</li>
  <li>The [OK] button implies that the dialog will enable it for me, but it does exactly the same as clicking the [Cancel] button. Consequently, the UI design is defective.</li>
  <li>The preferences dialog in Luna does not show anything under JDT or Weaving.</li>
  <li>The help search in Luna for "JTD Weaving" returns too much information to offer any simple solution.</li>
  <li>My search via Google turns up interesting discussion on the problem, but fails to simply state the solution, or if there is one.</li>
  </ul>
  
  <p><a href="https://groups.google.com/forum/#!msg/scala-ide-user/7GdTuQHyP4Q/aiUt70lnzigJ" rel="noreferrer">https://groups.google.com/forum/#!msg/scala-ide-user/7GdTuQHyP4Q/aiUt70lnzigJ</a></p>