@RequestMapping("/admin/ajax/product-variants/save-product-variant")
 @ResponseBody
 public Map<String, Object> saveProductVariant(VariantsGroupsVO data, HttpServletRequest request) {
   boolean success = productVariantService.saveProductVariant(data);
   String feedback =
       success
           ? getMessage(request, "ms_success_action_performed")
           : getMessage(request, "ms_error_action_not_performed");
   Map<String, Object> response = new HashMap<String, Object>();
   response.put("success", success);
   response.put("feedback", feedback);
   return response;
 }