public class MyDTO {
       @NotEmpty
       private String isKiosk;
       ...
}

http://localhost:1234/mvc/controllerUrl?isKiosk=false

@RequestMapping(method = RequestMethod.GET, produces = APPLICATION_JSON)
@ResponseBody
public ResponseEntity<List<?>> getRequestSupportKludge(@Valid final MyDTO myDTO, BindingResult bindingResult) {
    ...
}