Question

我的问题是来自URI-String的实体的反序列化。当我使用by Spring Data Rest生成的HTTP接口时，一切正常。我可以针对我的端点/api/shoppingLists发布以下JSON，并将其反序列化为以admin为所有者的购物清单。

{
  "name":"Test", 
  "owners":["http://localhost:8080/api/sLUsers/admin"]

}

当我使用自定义RepositoryRestController时，这不再起作用了。如果我将完全相同的JSON发布到同一个端点，我会收到此响应。

{
  "timestamp" : "2015-11-15T13:18:34.550+0000",
  "status" : 400,
  "error" : "Bad Request",
  "exception" : "org.springframework.http.converter.HttpMessageNotReadableException",
  "message" : "Could not read document: Can not instantiate value of type [simple type, class de.yannicklem.shoppinglist.core.user.entity.SLUser] from String value ('http://localhost:8080/api/sLUsers/admin'); no single-String constructor/factory method\n at [Source: java.io.PushbackInputStream@9cad4d2; line: 1, column: 26] (through reference chain: de.yannicklem.shoppinglist.core.list.entity.ShoppingList[\"owners\"]->java.util.HashSet[0]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class de.yannicklem.shoppinglist.core.user.entity.SLUser] from String value ('http://localhost:8080/api/sLUsers/admin'); no single-String constructor/factory method\n at [Source: java.io.PushbackInputStream@9cad4d2; line: 1, column: 26] (through reference chain: de.yannicklem.shoppinglist.core.list.entity.ShoppingList[\"owners\"]->java.util.HashSet[0])",
  "path" : "/api/shoppingLists"
}

My RepositoryRestController：

@RepositoryRestController
@ExposesResourceFor(ShoppingList.class)
@RequiredArgsConstructor(onConstructor = @__(@Autowired ))
public class ShoppingListRepositoryRestController {

  private final ShoppingListService shoppingListService;

  private final CurrentUserService currentUserService;

  @RequestMapping(method = RequestMethod.POST, value = ShoppingListEndpoints.SHOPPING_LISTS_ENDPOINT)
  @ResponseBody
  @ResponseStatus(HttpStatus.CREATED)
  public PersistentEntityResource postShoppingList(@RequestBody ShoppingList shoppingList,
    PersistentEntityResourceAssembler resourceAssembler) {

    if (shoppingListService.exists(shoppingList)) {
        shoppingListService.handleBeforeSave(shoppingList);
    } else {
        shoppingListService.handleBeforeCreate(shoppingList);
    }

    return resourceAssembler.toResource(shoppingListService.save(shoppingList));
  }
}

有人可以告诉我为什么反序列化不再适用于自定义RepositoryRestController（由docs建议）？

要利用Spring Data REST的设置，消息转换器，异常处理等，请使用@RepositoryRestController注释而不是标准的Spring MVC @Controller或@RestController

有关完整的源代码，请查看GitHub repo

Answer 1

要使用HAL MessageConverter，您应该将Resource作为参数。尝试将代码更改为：

 public PersistentEntityResource postShoppingList(@RequestBody Resource<ShoppingList> shoppingList)

Answer 2

在我的情况下，问题是pojo的字段名称和json字段之间的差异。即：

@Entity
public class Pojo{

   @ManyToOne(fetch = FetchType.EAGER, cascade = { CascadeType.ALL })
   @JoinColumn(name = "fk_myother")
   public Other myOther;
...etc
}

POST -> /dao/pojos
{
   "myother":"http://localhost:8034/dao/others/50"
}

请注意json字段应该是“ myOther ”。

希望这对某人有帮助。

Spring Data Rest：来自URI的RepositoryRestController反序列化不起作用

2 个答案: