java - JPA OneToMany、ManyToOne 关系的无限递归引用

Question

我在下面创建了一些域。

@Entity
public class Conference {

    ...

    @OneToMany(
        targetEntity = ProgramDate.class,
        mappedBy = "conference",
        cascade = CascadeType.REMOVE,
        fetch = FetchType.EAGER
     )
     @JsonBackReference
     private List<ProgramDate> programDateList;
}

@Entity
public class Program {

    ...

    @ManyToOne
    @JoinColumn(name = "program_date_id")
    @JsonBackReference
    private ProgramDate date;

    @ManyToOne
    @JoinColumn(name = "room_id")
    private Room room;
    ...
}

@Entity
public class ProgramDate {

    ...

    @OneToMany(
            targetEntity = Program.class,
            mappedBy = "date",
            fetch = FetchType.EAGER
    )
    @JsonBackReference
    private List<Program> programList;

    @ManyToOne
    @JoinColumn(name = "conference_id")
    private Conference conference;
}

@Entity
public class Room {

        ...

    @OneToMany(
            targetEntity = Program.class,
            mappedBy = "room",
            fetch = FetchType.EAGER
    )
    @JsonBackReference
    private List<Program> programList;
}

我制作了像下面的代码一样的 freemarker。

     <#list conference.programDateList as date>
        ...
     </#list>

我遇到一个问题，即 JPA OneToMany、ManyToOne 关系的无限递归引用。我尝试添加 @JsonBackReference，但它只解决了 json 递归问题。

Answer 1

使用 json 忽略注释:

@OneToMany(
        targetEntity = Program.class,
        mappedBy = "date",
        fetch = FetchType.EAGER
)
@JsonIgnore
private List<Program> programList;