code: private URL buildUrl(final String styleSheetPath, final boolean skipStylesFolder) {
  
          URL cssResource = null;
  
          final List<String> stylePaths = skipStylesFolder ? Collections.singletonList("") : ResourceParameters.STYLE_FOLDER.get();
  
          for (int i = 0; i < stylePaths.size() && cssResource == null; i++) {
  
              String stylePath = stylePaths.get(i);
              if (!stylePath.isEmpty()) {
                  stylePath += Resources.PATH_SEP;
              }
              cssResource = Thread.currentThread().getContextClassLoader().getResource(stylePath + styleSheetPath);
          }
  
          if (cssResource == null) {
              LOGGER.error("Style Sheet : {} not found into base folder: {}", styleSheetPath, ResourceParameters.STYLE_FOLDER.get());
          }
          return cssResource;
      }
docs: Get a style sheet URL.
  
  @param styleSheetPath the path of the style sheet, path must be separated by '/'
  
  @param skipStylesFolder skip stylesFolder usage
  
  @return the stylesheet url