code: @Override
  	public void destroy() {
  		final String sourceMethod = "destroy"; //$NON-NLS-1$
  		boolean isTraceLogging = log.isLoggable(Level.FINER);
  		if (isTraceLogging) {
  			log.entering(AbstractAggregatorImpl.class.getName(), sourceMethod);
  		}
  
  		shutdown();
  		super.destroy();
  
  		if (isTraceLogging) {
  			log.exiting(AbstractAggregatorImpl.class.getName(), sourceMethod);
  		}
  	}
docs: /* (non-Javadoc)
  @see javax.servlet.GenericServlet#destroy()