Java POST方法中存在不支持的媒体类型错误

我对控制器中的post方法有问题

应用程序获得了2个模型类：

public class MovieGenre {

   @Id
   @Column(name = "genre_id")
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long genreId;

   @Column(name = "genre_name")
   private String genreName;

   @ManyToMany(mappedBy = "genres")
   @JsonBackReference
   private Set<Movie> movies = new HashSet<>();

// getters and setters

现在是控制器类

@RestController
@RequestMapping(value = "api/v1/movie", produces = MediaType.APPLICATION_JSON_VALUE)
public class MovieController {

   private final MovieService movieService;

   public MovieController(MovieService movieService) {
       this.movieService = movieService;
   }

   @GetMapping
   public ResponseEntity<Resources<Resource<Movie>>> getAll() {
       Resources<Resource<Movie>> resources = new Resources<>(
               movieService.findAll()
                       .map(this::createResource)
                       .collect(Collectors.toList())
       );
       resources.add(linkTo(methodOn(MovieController.class).getAll()).withSelfRel());
       return ResponseEntity.ok().body(resources);
   }



   @PostMapping(value = "/add", consumes = MediaType.APPLICATION_JSON_VALUE)
   public ResponseEntity<?> addNewMovie(@RequestBody Movie newMovie) {
       Movie addedMovie = movieService.save(newMovie);
       return ResponseEntity
               .created(URI.create(createResource(addedMovie).getLink("self").getHref()))
               .build();
   }

// some other code

我在InteliJ控制台中获取：

2019-10-28 16:51:43.206  WARN 29729 --- [nio-8080-exec-3] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class com.progresspoint.movieapi.model.Movie]]: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot handle managed/back reference 'defaultReference': back reference type (java.util.Set) not compatible with managed type (com.progresspoint.movieapi.model.Movie)
2019-10-28 16:51:43.212  WARN 29729 --- [nio-8080-exec-3] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class com.progresspoint.movieapi.model.Movie]]: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot handle managed/back reference 'defaultReference': back reference type (java.util.Set) not compatible with managed type (com.progresspoint.movieapi.model.Movie)
2019-10-28 16:51:43.217  WARN 29729 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported]

邮递员

{
   "timestamp": "2019-10-28T15:51:43.225+0000",
   "status": 415,
   "error": "Unsupported Media Type",
   "message": "Content type 'application/json;charset=UTF-8' not supported",
   "path": "/api/v1/movie/add"
}

我在stackoverflow上看到了许多关于产品/消费的问题——这在这里没有帮助

---

我做错了什么

当您将

@RequestBody

与控制器中的一个方法参数一起使用时，无需指定consumes键@RequestBody建议它是

application/json

。您可以尝试删除它。

删除

consumes=MediaType.APPLICATION\u JSON\u VALUE

对于

@PostMapping

，您不必提及这一点。

@Deadpool我在电影和电影类型之间有双向关系，我想创建联接表-这就是我使用这些注释的原因。我还能怎么做？谢谢。我不知道。我把它拿走了。这对你没有帮助：）你能分享你调用服务url的方式吗。是否提供了所有标题、参数等？

@RestController
@RequestMapping(value = "api/v1/movie", produces = MediaType.APPLICATION_JSON_VALUE)
public class MovieController {

   private final MovieService movieService;

   public MovieController(MovieService movieService) {
       this.movieService = movieService;
   }

   @GetMapping
   public ResponseEntity<Resources<Resource<Movie>>> getAll() {
       Resources<Resource<Movie>> resources = new Resources<>(
               movieService.findAll()
                       .map(this::createResource)
                       .collect(Collectors.toList())
       );
       resources.add(linkTo(methodOn(MovieController.class).getAll()).withSelfRel());
       return ResponseEntity.ok().body(resources);
   }



   @PostMapping(value = "/add", consumes = MediaType.APPLICATION_JSON_VALUE)
   public ResponseEntity<?> addNewMovie(@RequestBody Movie newMovie) {
       Movie addedMovie = movieService.save(newMovie);
       return ResponseEntity
               .created(URI.create(createResource(addedMovie).getLink("self").getHref()))
               .build();
   }

// some other code

{
    "title": "Toy story 3",
    "year": "2014",
    "producer": "Pixar",
    "genres": [
        {
            "genreId": 1,
            "genreName": "action"
        },
        {
            "genreId": 2,
            "genreName": "animation"
        },
        {
            "genreId": 3,
            "genreName": "comedy"
        }
    ]}

2019-10-28 16:51:43.206  WARN 29729 --- [nio-8080-exec-3] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class com.progresspoint.movieapi.model.Movie]]: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot handle managed/back reference 'defaultReference': back reference type (java.util.Set) not compatible with managed type (com.progresspoint.movieapi.model.Movie)
2019-10-28 16:51:43.212  WARN 29729 --- [nio-8080-exec-3] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class com.progresspoint.movieapi.model.Movie]]: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot handle managed/back reference 'defaultReference': back reference type (java.util.Set) not compatible with managed type (com.progresspoint.movieapi.model.Movie)
2019-10-28 16:51:43.217  WARN 29729 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported]

{
   "timestamp": "2019-10-28T15:51:43.225+0000",
   "status": 415,
   "error": "Unsupported Media Type",
   "message": "Content type 'application/json;charset=UTF-8' not supported",
   "path": "/api/v1/movie/add"
}