k">Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. This method
 is only called once all threads within the servlet's <code>service</code> method have exited or after a timeout
 period has passed. After the servlet container calls this method, it will not call the <code>service</code> method
 again on this servlet.

 <p>
 This method gives the servlet an opportunity to clean up any resources that are being held (for example, memory, file
 handles, thre