如何解决DTO的modelMapper错误？

如何解决如何解决DTO的modelMapper错误？

我正在使用modelmapper，但有一个问题，就是DTO没有映射。

modelmapper mapping errors:

1) Error mapping domain.Order to domain.dto.order.OrderResponseInfo

1 error
org.modelmapper.MappingException: modelmapper mapping errors:

1) Error mapping domain.Order to dto.order.OrderResponseInfo

1 error
    at org.modelmapper.internal.Errors.throwMappingExceptionIfErrorsExist(Errors.java:374)
    at org.modelmapper.internal.MappingEngineImpl.map(MappingEngineImpl.java:69)
    at org.modelmapper.modelmapper.mapInternal(modelmapper.java:497)
    at org.modelmapper.modelmapper.map(modelmapper.java:340)
    at net.class101.homework.service.OrderService.orders(OrderService.java:74)

OrderService

    @Transactional  // it's okay
    public OrderResponseInfo order(OrderRequestInfo dto) {

        Product product = productRepository.findOneByNaturalKey(dto.getProduct().getNaturalKey())
                .orElseThrow(NotExistProductException::new);

        OrderProduct orderProduct = OrderProduct.createOrderProduct(product,product.getPrice(),dto.getCount());

        Order order = Order.createOrder(orderProduct);
        orderRepository.save(order);

        return modelmapper.map(order,OrderResponseInfo.class);
    }

    @Transactional // it's modelmapperError
    public OrderResponseInfo orders(List<OrderRequestInfo> orderRequests) {

        List<OrderProduct> orderProducts = new ArrayList<>();

        for(OrderRequestInfo order : orderRequests){
            orderProducts.add(OrderProduct.createOrderProduct(order.getProduct(),order.getorderPrice(),order.getCount()));
        }

        Order order = Order.createOrder(orderProducts.toArray(new OrderProduct[0]));
        orderRepository.save(order);

        return modelmapper.map(order,OrderResponseInfo.class);
    }

DTO

@Getter
@Setter
@NoArgsConstructor
public class OrderResponseInfo {

    private Long id;
    private Order order;
    private BigDecimal totalOrderPrice;
    private BigDecimal shippingCharge;
    private BigDecimal requirePaymentPrice;
    private List<OrderProduct> orderProducts;

    public OrderResponseInfo(Long id,Order order) {
        this.id = id;
        this.order = order;
        this.totalOrderPrice = order.getTotalPrice();
        this.shippingCharge = order.getShippingCharge();
        this.requirePaymentPrice = order.getRequirePaymentPrice();
        this.orderProducts = order.getorderProducts();
    }
}

Order和OrderProduct之间存在“一对多”的关系，我们认为一个订单可以有多个OrderProducts。

当我现在测试一个订单时，modelmapper正常工作。

但是，modelmapper处理多个订单时出错，但是我不确定为什么。

单个订单（OrderService.order()）和多个订单（OrderService.orders()）之间的唯一区别是因素和通过for循环产生的OrderProduct之间的区别。 / p>

已编辑

使用return modelmapper.map (order,orderResponseInfo.class);代替return new OrderResponseInfo(order.getId(),order);来确认映射正常工作。

为什么会这样？