title: AWT-Shutdown and AWT-EventQueue do not terminate after plotting a 2D graph with JFreeChart
body: <p>I am trying to do something really basic;
  Plot an array of integers as time-series data using JFreeChart. Previously the code was working perfectly fine. That is the point that drives me crazy.
  However, now it fails to terminate after doing everything it is supposed to do. Active threads are as follows;</p>
  
  <pre><code>Thread[AWT-Shutdown,5,main]
  Thread[AWT-EventQueue-0,6,main]
  Thread[main,5,main]
  </code></pre>
  
  <p>I am using a Macbook with Mac OS 10.6.8 on it, and got a set of recent software updates.</p>
  
  <p>Does anybody have any clue about where to start, and what to look for?</p>