code: public static ResourceUtils getResourceUtils() {
      if (resourceUtils == null) {
        try {
          Class clazz = Class.forName(RESOURCE_UTILS);
          resourceUtils = (ResourceUtils) clazz.newInstance();
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
          LOGGER.warn("Cannot instanciate util: {}", e.getMessage());
          throw new IllegalStateException(e);
        }
      }
      return resourceUtils;
    }
docs: Retrieve ResourceUtils implementation
  @return ResourceUtils instance