在Spring Rest应用中，“Content type 'application/json;charset=UTF-8'不受支持”。

当我在localhost:8080/api/users上进行POST请求以创建一个新用户时，我收到以下错误：

{

这是请求的主体，选择了JSON（application/json）。

即使我删除了Roles并将其保持为null，它仍然会给出相同的错误。

头部的内容类型也是application/json。

这是我的控制器：

@PostMapping("/api/users" )
public User createUser(@Valid @RequestBody User user) {
    securityService.autologin(user.getUsername(), user.getPassword());
    return userService.createUser(user);
}

UserService中的createUser函数：

public User createUser(@Valid @RequestBody User user) {
    user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
    user.setRoles(new HashSet<>(roleRepository.findAll()));
    return userRepository.save(user);
}

这是我的User类：

@Entity
@Table(name = "user")
@EntityListeners(AuditingEntityListener.class)
@JsonIgnoreProperties(value = {"createdAt", "updatedAt"}, allowGetters = true)
public class User implements Serializable{
    private static final long serialVersionUID = 1L;
    public User() {
        super();
        // TODO Auto-generated constructor stub
    }
    @Id
    @Column(name = "user_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    @Column(name = "user_name")
    private String name;
    @Column(name = "user_email")
    private String email;
    @Column(name = "user_password")
    @NotBlank
    private String password;
    @Column(name = "user_status")
    private String status;
    @Column(name = "user_tel")
    private String tel;
    @Column(name = "user_confirmation")
    private String confirmation;
    @Column(name = "user_birth_date")
    @Temporal(TemporalType.DATE)
    private Date birth_date;
    @Column(nullable = false, updatable = false)
    @Temporal(TemporalType.TIMESTAMP)
    @CreatedDate
    private Date createdAt;
    @Column(nullable = false)
    @Temporal(TemporalType.TIMESTAMP)
    @LastModifiedDate
    private Date updatedAt;
    @JsonManagedReference
    @ManyToMany
    @JoinTable(name = "user_role", joinColumns = @JoinColumn(name = "user_id"), inverseJoinColumns = @JoinColumn(name = "role_id"))
    private Set roles;
    @Column(name = "username")
    @NotBlank
    private String username;
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    public String getTel() {
        return tel;
    }
    public void setTel(String tel) {
        this.tel = tel;
    }
    public String getConfirmation() {
        return confirmation;
    }
    public void setConfirmation(String confirmation) {
        this.confirmation = confirmation;
    }
    public Date getBirth_date() {
        return birth_date;
    }
    public void setBirth_date(Date birth_date) {
        this.birth_date = birth_date;
    }
    public Date getCreatedAt() {
        return createdAt;
    }
    public Date getUpdatedAt() {
        return updatedAt;
    }
    public void setUpdatedAt(Date updatedAt) {
        this.updatedAt = updatedAt;
    }
    public Set getRoles() {
        return roles;
    }
    public void setRoles(Set roles) {
        this.roles = roles;
    }
}