Spring关于我的项目中的findAll（）函数错误

Question

我的项目中基本上有用户和角色实体。

@Entity
@Table(name="`User`")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String name;
    private String username;
    private String password;
    @ManyToMany(fetch = EAGER)
    private Collection<Role> roles = new ArrayList<>();
}

@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Role {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String name;
    @ManyToMany(mappedBy = "roles")
    private List<User> users= new ArrayList<User>();

}

这是我的控制器课程

java prettyprint-override">@RestController
@RequestMapping("/api")
@RequiredArgsConstructor
public class UserResource {
    private final UserService userService;

     @GetMapping("/users")
    public ResponseEntity<List<User>> getUsers(){

        return ResponseEntity.ok().body(userService.getUsers());
    }

这是我的UserManager课程

@Service @RequiredArgsConstructor @Transactional @Slf4j
public class UserManager implements UserService {
    private final UserRepo userRepo;
    private final RoleRepo roleRepo;

     @Override
    public List<User> getUsers() {
        log.info("Fetching all users {}" );
        return userRepo.findAll() ;
    }
}

当我请求http://localhost:8080/api/users时，我得到了这样的错误数据

[{"id":5,"name":"Emirhan Ay","username":"emrhn1888","password":"1234","roles":[{"id":1,"name":"ROLE_USER","users":[{"id":5,"name":"Emirhan Ay","username":"emrhn1888","password":"1234","roles":[{"id":1,"name":"ROLE_USER","users":[{"id":5,"name":"Emirhan Ay","username":"emrhn1888","password":"1234","roles":[{"id":1,"name":"ROLE_USER","users":[{"id":5,"name":"Emirhan Ay","username":"emrhn1888","password":"1234","roles":[{"id"}]}]}]}]

我的错在哪里？提前感谢您的回答。

Answer 1

您有循环依赖关系。用户有角色，角色有用户，等等。您可能应该首先将实体映射到DTOS，然后添加@JsonManaged引用或@JsonBack引用。

或者你可以简单地把@JsonIgnore放在私有列表中