@Getter
public class ServiceException extends RuntimeException {

    private HttpStatus status;
    private ResultCode resultCode;
    private Object     errorData;

    private ServiceException(HttpStatus status, ResultCode resultCode, Object errorData){
        this.status     = status;
        this.resultCode = resultCode;
        this.errorData  = errorData;
    }

    public static ServiceException badRequest(ResultCode resultCode, Object errorData){
        return new ServiceException(HttpStatus.BAD_REQUEST, resultCode, errorData);
    }
}

@Getter
public enum ResultCode {
    // errorCode
    SUCCESS(0, "SUCCESS"),
    INVALID_PARAMETER(600, "invalid parameter");

    private final int errorCode;
    private final String errorData;

    ResultCode(int errorCode, String errorData){
        this.errorCode = errorCode;
        this.errorData = errorData;
    }
}

@ControllerAdvice
public class GlobalErrorHandler {

    @ExceptionHandler(ServiceException.class)
    public ResponseEntity<ErrorResponse> handleServiceException(ServiceException ex){
        return ResponseEntity
                .status(ex.getStatus())
                .body(ErrorResponse.failed(ex.getResultCode(), ex.getErrorData()));
    }
}


@ApiModel
@Getter
public class ErrorResponse<T> implements Serializable {

    private static final long serialVersionUID = -2254339918462802230L;

    private final int errorCode;
    private final String errorMsg;
    private final T errorData;

    private ErrorResponse(ResultCode resultCode, T errorData) {
        this.errorCode = resultCode.getErrorCode();
        this.errorMsg  = resultCode.getErrorData();
        this.errorData = errorData;
    }

    public static <T> ErrorResponse<T> failed(ResultCode resultCode, T data){
        return new ErrorResponse(resultCode, data);
    }
}

@RestController
public class OrderController {

    @GetMapping(value = "/v1/orders/{order_id}"/*, produces = {"application/toString", "application/json"}*/)
    public Order getOrder(@PathVariable("order_id") @NotBlank String orderId){

        Order order = new Order();
        BigDecimal total = new BigDecimal(-1.00, new MathContext(2, RoundingMode.HALF_UP));

        if (total.compareTo(BigDecimal.ZERO) <= 0){
            throw ServiceException.badRequest(ResultCode.INVALID_PARAMETER,
                    "Total is less than zero!");
        }
        order.setOrderId(orderId);
        order.setTotal(total);
        return order;
    }
}