code: private URL getStaticFileFromMetaInfResourcesDir(String fileName) {
          String finalNameWithoutLeadingSlash 
                  = assetsControllerHelper.normalizePathWithoutLeadingSlash(fileName, true);
          URL url = null; 
          url = this.getClass().getClassLoader().getResource("META-INF/resources/webjars/" + finalNameWithoutLeadingSlash);
          return url;
      }
docs: Loads files from META-INF/resources directory.
  This is compatible with Servlet 3.0 specification and allows
  to use e.g. webjars project.