docs: public void marshall(UpdateAppRequest updateAppRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (updateAppRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(updateAppRequest.getAppId(), APPID_BINDING);
              protocolMarshaller.marshall(updateAppRequest.getName(), NAME_BINDING);
              protocolMarshaller.marshall(updateAppRequest.getDescription(), DESCRIPTION_BINDING);
              protocolMarshaller.marshall(updateAppRequest.getRoleName(), ROLENAME_BINDING);
              protocolMarshaller.marshall(updateAppRequest.getServerGroups(), SERVERGROUPS_BINDING);
              protocolMarshaller.marshall(updateAppRequest.getTags(), TAGS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }