docs: public void validateCreate(AppNewForm appNewForm) {
  
          // trim
          if (appNewForm.getApp() != null) {
              appNewForm.setApp(appNewForm.getApp().trim());
          }
          if (appNewForm.getDesc() != null) {
              appNewForm.setDesc(appNewForm.getDesc().trim());
          }
  
          App app = appMgr.getByName(appNewForm.getApp());
          if (app != null) {
              throw new FieldException(AppNewForm.APP, "app.exist", null);
          }
      }