Question

我有两个实体：

@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Order {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Column(nullable = true)
    private String name;

    @OneToMany(mappedBy = "order",
                cascade = CascadeType.ALL)
    private List<Product> products = new ArrayList<>();

    public void addProduct(Product product) {
        products.setOrder(this);
        getProducts().add(product);
    }
}

第二个：

@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @ManyToOne(targetEntity = Order.class)
    @JoinColumn(name = "product_id", referencedColumnName = "id")
    private Order order;

}

控制器：

@RestController
@RequestMapping("/api")
public class PersistenceController {

    @Autowired
    private OrderRepository repository;

    @PostConstruct
    private void init() {
        Order order = new Order();
        order.setName("some_order");

        Product product = new Product();
        order.addProduct(product);

        repository.save(order);
    }

    @RequestMapping(value = "/getAll", method = RequestMethod.GET)
    @ResponseBody
    List<Order> getAll() {
        return repository.findAll();
    }
}

例外情况如下：

无法写入HTTP消息： org.springframework.http.converter.HttpMessageNotWritableException：无法写内容：无法设置字段值[Product（id = 1， order = null）]通过反射的值：[class model.entities.Product.order] setter of model.entities.Product.order（通过引用链：的java.util.ArrayList [0] - ＆GT; model.entities.RoomEntity [ “产品”]）;嵌套异常是com.fasterxml.jackson.databind.JsonMappingException：无法设置字段值[Product（id = 1，day = null，startHour = null， endHour = null，order = null）]通过反射的值：[class model.entities.Product.order] model.entities.Product.order的setter （通过参考链： java.util.ArrayList [0] - ＆gt; model.entities.Order [“products”]）2017-04-15 17：38：36.073 WARN 18200 --- [nio-8091-exec-1] o.h.e.loading.internal.LoadContexts：HHH000100：故障安全清理（集合）： org.hibernate.engine.loading.internal.CollectionLoadContext@3713fa6c 2017-04-15 17：38：36.073 WARN 18200 --- [nio-8091-exec-1] o.h.e.l.internal.CollectionLoadContext：HHH000160：开 CollectionLoadContext＃cleanup，localLoadingCollectionKeys包含 [1]条目

Spring：无法编写HTTP消息：org.springframework.http.converter.HttpMessageNotWritableException：

0 个答案: