title: Spoon: No more handles [Could not detect registered XULRunner to use]
body: <p>I am using Pentaho Data Integration tool 4.4.0 on my Ubuntu 14.04</p>
  
  <pre><code>uname -a
  Linux LT0124 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  </code></pre>
  
  <p>When I am closing PDI I am getting pop up window with following error:</p>
  
  <pre><code>An unexpected error occurred in Spoon:
  No more handles [Could not detect registered XULRunner to use]
  org.eclipse.swt.SWTError: [Could not detect registered XULRunner to use]
  ...
  
  ![Spoon pop up window with an error][1]
  </code></pre>
  
  <p>I am using following version of java:</p>
  
  <pre><code>java version "1.8.0_05"
  Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
  Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)
  </code></pre>
  
  <p>Please do let me know how can I get rid of this error.</p>