springboot restcontroller requestparam 설정 @GetMapping(value = "/test") public Map accounts( @RequestParam(value = "code") String code, @RequestParam(value = "page" , required = false, defaultValue = "0") int page, @RequestParam Map req) throws Exception { @RequestParam 필수값 exception handler 잘못된 예 @ControllerAdvice @RestController public class ResponseExceptionHandler extends ResponseEntityExcept..