code: <A extends Annotation> A findAnnotation(TypeElement element, Class<A> anno) {
  
      final A annotation = element.getAnnotation(anno);
      if (annotation != null) {
        return annotation;
      }
      final TypeMirror typeMirror = element.getSuperclass();
      if (typeMirror.getKind() == TypeKind.NONE) {
        return null;
      }
      final TypeElement element1 = (TypeElement)typeUtils.asElement(typeMirror);
      return findAnnotation(element1, anno);
    }
docs: Find the annotation searching the inheritance hierarchy.