docs: private static String convertResourceName(Class<?> klass, String resource) {
          if (resource.startsWith("/")) {
              // "absolute" resource, chop the slash
              return resource.substring(1);
          } else {
              String className = klass.getName();
              int i = className.lastIndexOf('.');
              if (i < 0) {
                  // no package
                  return resource;
              } else {
                  // need to be relative to the package
                  String packageName = className.substring(0, i);
                  String packagePath = packageName.replace('.', '/');
                  return packagePath + "/" + resource;
              }
          }
      }