JPA OneToMany，ManyToOne Relationship的无限递归引用

Question

我在下面制作了一些域名。

> VM188:30554 WARNING: Tried to load angular more than once.

我制作了像下面的代码一样的freemarker。

@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;
}

我遇到的问题是JPA OneToMany，ManyToOne Relationship的无限递归引用。我尝试添加 <#list conference.programDateList as date> ... </#list> ，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;

Answer 2

为什么要包括Room＆amp;参加大会的计划，然后在计划中添加会议室和会议室。一个应该已经包含在会议中的计划日期？然后在ProgramDate中你有另一个对...会议和程序列表的引用......

基本上你不应该尝试用一些花哨的注释来“破解”这些循环，但你应该处理你的数据模型。会议看起来还不错，计划可能只是一个会议清单，计划日期应该是......约会。