java - 无法通过反射 hibernate 获取字段值

Question

我在jpa中更新对象时遇到问题

我有bean用户

public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Long id;
    @Column(name = "name", nullable = false)
    private String name;
    @OneToMany(fetch = FetchType.EAGER)
    @JoinColumn(name = "fk_program_rating")
    private List<Rating> ratingList = new ArrayList<Rating>();
}

和

public class Rating extends BaseModel {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Long id;
    @ManyToOne()
    @JoinColumn(name = "fk_program_rating", nullable = false)
    @ForeignKey(name = "FK_prog_rate")
    @OnDelete(action = OnDeleteAction.CASCADE)
    private Program program;
}

当尝试更新时出现异常:无法通过反射获取字段值当表格评分有行时会发生这种情况

ERROR TransactionInterceptor:434 - Application exception overridden by commit exception com.vodafone.visradio.dataaccess.exception.DataAccessException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of com.vodafone.visradio.dataaccess.model.Rating.id

关于这个问题的任何帮助
谢谢

Answer 1

尝试更改映射注释。从 ratingList 中删除 @JoinColumn 注释并添加 mappedBy 属性:

@OneToMany(fetch = FetchType.EAGER, mappedBy = "user") 
private List<Rating> ratingList = new ArrayList<Rating>();

其中 user 是 Rating 实体中的属性名称，它与 User 具有 @ManyToOne 关联。