Member member = memberRepository.findById(request.getUserId())
                /*.orElseThrow(() -> new ApiException(ErrorType.USER_NOT_FOUND));*/
                .orElse(null);
        if(member == null){
            webSocketErrorController.handleChatMessage(ErrorType.USER_NOT_FOUND);
            throw new ApiException(ErrorType.USER_NOT_FOUND);
        }

// 유저 정보
User user = userRepository.findById(request.getUserId())
                .orElseThrow(() -> {
                    webSocketErrorController.handleChatMessage(ErrorType.USER_NOT_FOUND);
                    return new ApiException(ErrorType.USER_NOT_FOUND);
                    }
                );