休眠多个表的一对多映射

Roopam：

@Entity
@Table(name="Visit")
public class Visit {
    @Id
    @XmlTransient
    @JsonIgnore
    @SequenceGenerator(name = "v_id_seq", sequenceName = "v_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "v_id_seq")
    @Column(name = "id")
    private Long id;

    @OneToMany(mappedBy = "Visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
    private List<directions> directions;

    @OneToMany(mappedBy = "Visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
    private List<Test> Test;

@Entity
@Table(name="test")
public class Test {
    @Id
    @XmlTransient
    @JsonIgnore
    @SequenceGenerator(name = "t_id_seq", sequenceName = "t_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "t_id_seq")
    @Column(name = "id")
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JsonBackReference
    @JoinColumn(name = "vid", updatable = false, insertable = true,referencedColumnName = "id")
    private Visit visit;

@Entity
@Table(name="direction")
public class directions {
    @Id
    @XmlTransient
    @JsonIgnore
    @SequenceGenerator(name = "d_id_seq", sequenceName = "d_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "d_id_seq")
    @Column(name = "id")
    private Long id;
    @ManyToOne(fetch = FetchType.LAZY)
    @JsonBackReference
    @JoinColumn(name = "vid", updatable = false, insertable = true,referencedColumnName = "id")
    private Visit Visit;

您好，我刚进入休眠状态，我试图映射OneToMany Visit-> Test and Visit-> direction但出现错误 Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property:

一次访问可以有多个方向，并测试如何实现此目的？

请帮我！

乔治：

批注中的mappedBy字段值@OneToMany引用Java实例变量名称，并且区分大小写。您将其设置为Visit，但是在directions和test类中，变量名是visit。

解决方案是将属性mappedBy从更改Visit为visit（小写V）：

@OneToMany(mappedBy = "visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
private List<directions> directions;

@OneToMany(mappedBy = "visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
private List<Test> Test;

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