<p>As the JavaDoc states, DateFormats are inherently unsafe for multithreaded use. 
The detector has found a call to an instance of DateFormat that has been obtained via a static
field. This looks suspicous.</p>
<p>For more information on this see <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6231579">Sun Bug #6231579</a>
and <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6178997">Sun Bug #6178997</a>.</p>