code: protected URL getStylesheetURL() {
  		URL url = this.getClass().getClassLoader().getResource(getStylesheetLocation());
  		if (url == null) {
  			try {
  				if (getStylesheetLocation().startsWith("http://")) {
  					return new URL(getStylesheetLocation());
  				}
  				return new File(getStylesheetLocation()).toURI().toURL();
  			} catch (MalformedURLException mue) {
  				return null;
  			}
  		} else {
  			return url;
  		}
  	}
docs: Returns the URL of the stylesheet. You can override this operation to return a URL pointing to a stylesheet residing
  on a location that can be adressed by a URL. By default, it will return a stylesheet that will be loaded from the
  classpath, using the resource name returned by {@link #getStylesheetLocation()}.
  
  @return The URL of the stylesheet.