org.hibernate.PropertyAccessException: 无法通过反射为字符串设置字段值 [STRING] 值

Question

用于 @ManyToMany 关系和附加列的 @Embeddable 是否适用于 String？我不使用 @Generated Value for @Id 因为我的实体 ApplikationUser

@Id
@Column(length = 128)
private String applikationUserId;

根据业务逻辑总是 Id

这是我的代码：

@EmbeddedId
private ApplikationUserPopupMessageId applikationUserPopupMessageId;

@ManyToOne(fetch = FetchType.EAGER)
@MapsId("applikationUserId")
private ApplikationUser applikationUser;

@ManyToOne(fetch = FetchType.EAGER)
@MapsId("popupMessageId")
private PopupMessage popupMessage;

@Column(name = "gelesen")
private boolean gelesen = false;

@Embeddable
public class ApplikationUserPopupMessageId implements Serializable {

    @Column(name = "applikation_user_id")
    private String applikationUserId;

    @Column(name = "popup_message_id")
    private Long popupMessageId;

@Entity
@Table
public class PopupMessage {

    @Id
    @GeneratedValue
    @Column(length = 128)
    private Long messageId;

    private String title;
    private String message;

    @OneToMany(
            mappedBy = "applikationUser",
            cascade = CascadeType.ALL,
            orphanRemoval = true
    )
    private List<ApplikationUserPopupMessage> applikationUserPopupMessages = new ArrayList<>();

@Entity
public class ApplikationUser implements UserDetails {

    /**
     *
     */
    private static final long serialVersionUID = -5517804528054972083L;

    @Id
    @Column(length = 128)
    private String applikationUserId;

    @Column
    private String password;

    @ManyToOne
    @JoinColumn(name = "idRole")
    private Role role;

    private boolean enabled = true;

    @OneToMany(
            mappedBy = "popupMessage",
            cascade = CascadeType.ALL,
            orphanRemoval = true
    )
    private List<ApplikationUserPopupMessage> applikationUserPopupMessages = new ArrayList<>();

编辑 - 2020 年 11 月 23 日 关于缺乏兴趣，我们似乎可以 @Embeddable 和 String?

Answer 1

只需将相应属性的 getter 和 setter 放入 @Embeddable。

Answer 2

如果您将实体 class 注释为字段的访问级别

会有帮助吗

@Entity(access = AccessType.FIELD)

Answer 3

实例化applikationUserPopupMessageId:

@Entity
public class ApplikationUserPopupMessage {
  @EmbeddedId
  private ApplikationUserPopupMessageId applikationUserPopupMessageId = new ApplikationUserPopupMessageId();
}

那是known issue

org.hibernate.PropertyAccessException: 无法通过反射为字符串设置字段值 [STRING] 值

org.hibernate.PropertyAccessException: Could not set field value [STRING] value by reflection for String

java

many-to-many

jpa