java Spring Data REST：“没有从字符串值反序列化的字符串参数构造函数/工厂方法”
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原文地址: http://stackoverflow.com/questions/40986738/
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Spring Data REST: "no String-argument constructor/factory method to deserialize from String value"
提问by Jan Nielsen
When I use Lombok in my Spring Data REST application to define complex types like:
当我在 Spring Data REST 应用程序中使用 Lombok 来定义复杂类型时，例如：
@NoArgsConstructor
@AllArgsConstructor
@Data
@Entity
@Table(name = "BOOK")
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(nullable = false)
private Long id;
private String title;
@ManyToOne(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH})
private Person author;
// ...
}
with a Spring Data REST controllers like:
使用 Spring Data REST 控制器，例如：
@RepositoryRestController
public class BookRepositoryRestController {
private final BookRepository repository;
@Autowired
public BookRepositoryRestController(BookRepository repository) {
this.repository = repository;
}
@RequestMapping(method = RequestMethod.POST,value = "/books")
public @ResponseBody PersistentEntityResource post(
@RequestBody Book book,
PersistentEntityResourceAssembler assembler) {
Book entity = processPost(book);
return assembler.toResource(entity);
}
private Book processPost(Book book) {
// ...
return this.repository.save(book);
}
}
I get an ugly error:
我收到一个丑陋的错误：
no String-argument constructor/factory method to deserialize from String value
from Spring Data REST's use of Hymanson with a Book POST like:
来自 Spring Data REST 使用 Hymanson 与 Book POST 类似：
curl -X POST
-H 'content-type: application/json'
-d '{"title":"Skip Like a Pro", "author": "/people/123"}'
http://localhost:8080/api/books/
The de-serialization error happens when Hymanson tries to resolve the /people/123local URI which should resolve to a single, unique Person. If I remove my @RepositoryRestController, everything works fine. Any idea what's wrong with my REST controller definition?
当 Hymanson 尝试解析/people/123应该解析为单个唯一Person. 如果我删除 my @RepositoryRestController，一切正常。知道我的 REST 控制器定义有什么问题吗？
回答by Jan Nielsen
In the @RepositoryRestController, change the type of the @RequestBodyargument from Bookto Resource<Book>:
在 中@RepositoryRestController，将@RequestBody参数的类型从更改Book为Resource<Book>：
import org.springframework.hateoas.Resource;
// ...
@RequestMapping(method = RequestMethod.POST,value = "/books")
public @ResponseBody PersistentEntityResource post(
@RequestBody Resource<Book> bookResource, // Resource<Book>
PersistentEntityResourceAssembler assembler) {
Book book = bookResource.getContent()
// ...
}
and in the Bookentity definition modify the AllArgsConstructorannotation to be: @AllArgsConstructor(suppressConstructorProperties = true).
并在Book实体定义中将AllArgsConstructor注释修改为：@AllArgsConstructor(suppressConstructorProperties = true)。
See Spring Data REST #687for more information.
有关更多信息，请参阅Spring Data REST #687。
