询问休眠：错误：mappedBy 引用未知的目标实体属性答案

【问题标题】：ASK HIBERNATE: ERROR: mappedBy reference an unknown target entity property询问休眠：错误：mappedBy 引用未知的目标实体属性
【发布时间】：2014-12-26 22:37:02
【问题描述】：

这是我的 sql

CREATE TABLE room
(
    room_id INT,
    primary key (room_id)
) ENGINE=InnoDB;
CREATE TABLE people
(
    people_id INT,
    live_in INT,
    primary key (people_id),
    foreign key (live_in) references room(room_id)
) ENGINE=InnoDB;

这是我的第二个实体

@Entity
@Table(name="room")
public class RoomClass{
    private int RoomIdMember;
    private Set<PeopleClass> Peoples = new HashSet<PeopleClass>(0);

    @Id
    @Column(name="room_id")
    public int getRoomIdMember() {
        return RoomIdMember;
    }
    public void setRoomIdMember(int roomIdMember) {
        RoomIdMember = roomIdMember;
    }

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "LiveInMem")
    public Set<PeopleClass> getPeoples() {
        return Peoples;
    }
    public void setPeoples(Set<PeopleClass> peoples) {
        Peoples = peoples;
    }   
}

@Entity
@Table(name="people")
public class PeopleClass {
    private int PeopleIdMem;
    private RoomClass LiveInMem;

    @Id
    @Column(name="people_id")
    public int getPeopleIdMem() {
        return PeopleIdMem;
    }
    public void setPeopleIdMem(int peopleIdMem) {
        PeopleIdMem = peopleIdMem;
    }
    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    //@ManyToOne
    @JoinColumn(name="live_in", referencedColumnName="room_id")
    public RoomClass getLiveInMem() {
        return LiveInMem;
    }
    public void setLiveInMem(RoomClass liveInMem) {
        LiveInMem = liveInMem;
    }
}

在主函数中，当我写的时候

Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
...

Eclipse 说

mappedBy reference an unknown target entity property: quang.entity.PeopleClass.LiveInMem in quang.entity.RoomClass.peoples

为什么会出现这个错误？

【问题讨论】：

尝试使用小写的peoples作为变量名
哦，它工作，:) 非常感谢你

标签： java hibernate runtime-error hibernate-onetomany

【解决方案1】：

尝试将Peoples 和所有其他类变量设为小写。
这是通常/标准的Java 代码约定。
我不确定，但我强烈怀疑这与您的问题有关。

【讨论】：