JPA 获取数据时堆栈溢出错误

Question

我有 2 个实体，即教师和俱乐部，我需要检索教师数据及其相关的俱乐部和/或运动。 我对JPA有点陌生，所以在调试我在 Teacher 存储库上使用findAll方法时遇到的堆栈溢出错误时遇到了麻烦。 我曾尝试将@JsonIgnore注释添加到我的一对多注释中，以处理一些类似问题中建议的递归问题，但仍然遇到问题，并且不确定它应该如何解决问题。

教师实体：

  @Entity
@Table(name = "TEACHER")
public class Teacher {
    private String id;
    private String name;
    private Collection<ClubTeacher> clubTeachersById;
  

    @Id
    @Column(name = "Id", nullable = false, length = 10)
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @Basic
    @Column(name = "NAME", nullable = true, length = 25)
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Teacher teacher = (Teacher) o;

        if (id != null ? !id.equals(teacher.id) : teacher.id != null) return false;
        if (name != null ? !name.equals(teacher.name) : teacher.name != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = id != null ? id.hashCode() : 0;
        result = 31 * result + (name != null ? name.hashCode() : 0);
        return result;
    }

    @OneToMany(mappedBy = "TICClub" ,fetch = FetchType.EAGER)
    public Collection<ClubTeacher> getClubTeachersById() {
        return clubTeachersById;
    }

    public void setClubTeachersById(Collection<ClubTeacher> clubTeachersById) {
        this.clubTeachersById = clubTeachersById;
    }

}

俱乐部实体：

@Entity
@Table(name = "CLUB_TEACHER", schema = "abbc", catalog = "")
@IdClass(ClubTeacherPK.class)
public class ClubTeacher implements Serializable {
    private String tic;
    private String clubkey;
    private Teacher teacherByTic;

    @Id
    @Column(name = "TIC", nullable = false, length = 10)
    public String getTic() {
        return tic;
    }

    public void setTic(String tic) {
        this.tic = tic;
    }

    @Id
    @Column(name = "CLUBKEY", nullable = false, length = 25)
    public String getClubkey() {
        return clubkey;
    }

    public void setClubkey(String clubkey) {
        this.clubkey = clubkey;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        ClubTeacher that = (ClubTeacher) o;

        if (tic != null ? !tic.equals(that.tic) : that.tic != null) return false;
        if (clubkey != null ? !clubkey.equals(that.clubkey) : that.clubkey != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = tic != null ? tic.hashCode() : 0;
        result = 31 * result + (clubkey != null ? clubkey.hashCode() : 0);
        return result;
    }

    @ManyToOne
    @JoinColumn(name = "TIC", referencedColumnName = "Id", nullable = false,insertable=false, updatable=false)
    public Teacher getTeacherByTic() {
        return teacherByTic;
    }
    public void setTeacherByTic(Teacher teacherByTic) {
        this.teacherByTic = teacherByTic;
    }
}

堆栈跟踪：

2021-02-17 21:42:56.516 ERROR 20546 --- [nio-3005-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.StackOverflowError] with root cause

java.lang.StackOverflowError: null
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.6.jar:na]
    at com.google.gson.Gson$FutureTypeAdapter.write(Gson.java:1027) ~[gson-2.8.6.jar:na]
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.6.jar:na]
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:127) ~[gson-2.8.6.jar:na]
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:245) ~[gson-2.8.6.jar:na]
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[gson-2.8.6.jar:na]
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:97) ~[gson-2.8.6.jar:na]
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:61) ~[gson-2.8.6.jar:na]
....