java - 使用mappedby属性时出现Hibernate异常

Question

我正在尝试在 pojo 类中的表之间进行映射。但我收到一个属性的异常。Pojo 类

用户:

@Entity
@Table(name = "Users")
public class Users implements java.io.Serializable {

    private int userId;
    private Role role;
    private Groups groupId;
    private UserType userType;
    private String userName;
    private Boolean isActive;



    public Users() {
    }

    public Users(int userId, Role role, Groups groupId ,UserType userType, String userName, boolean isActive) {
        this.userId = userId;
        this.role = role;
        this.groupId = groupId;
        this.userType = userType;
        this.userName = userName;
        this.isActive = isActive;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "UserID", unique = true, nullable = false)
    public int getUserId() {
        return this.userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "RoleID", nullable = false)
    public Role getRole() {
        return this.role;
    }

    public void setRole(Role role) {
        this.role = role;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "GroupId", nullable = false)
    public Groups getGroup() {
        return this.groupId;
    }

    public void setGroup(Groups group) {
        this.groupId = group;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "UserTypeID", nullable = false)
    public UserType getUserType() {
        return this.userType;
    }

    public void setUserType(UserType userType) {
        this.userType = userType;
    }

    @Column(name = "UserName", nullable = false)
    public String getUserName() {
        return this.userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    @Column(name = "IsActive", nullable = false, columnDefinition = "BIT")
    public Boolean isIsActive() {
        return this.isActive;
    }

    public void setIsActive(Boolean isActive) {
        this.isActive = isActive;
    }

    }

群组:

@Entity
@Table(name = "Groups")
public class Groups implements java.io.Serializable{

    private int groupId;
    private String groupName;
    private String groupDesc;

    private Set<Users> users = new HashSet<Users>(0);

    public Groups (){

    }

    public Groups(int groupId, String groupName, String groupDesc){
        super();
        this.groupId = groupId;
        this.groupName = groupName;
        this.groupDesc = groupDesc;
    }

    public Groups(int groupId, String groupName, String groupDesc, Set<Users> users) {
        super();
        this.groupId = groupId;
        this.groupName = groupName;
        this.groupDesc = groupDesc;
        this.users = users;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name ="GroupID", nullable = false)
    public int getGroupId() {
        return groupId;
    }

    public void setGroupId(int groupId) {
        this.groupId = groupId;
    }

    @Column(name = "GroupName", nullable = false)
    public String getGroupName() {
        return groupName;
    }

    public void setGroupName(String groupName) {
        this.groupName = groupName;
    }

    @Column(name = "GroupDesc", nullable = false)
    public String getGroupDesc() {
        return groupDesc;
    }

    public void setGroupDesc(String groupDesc) {
        this.groupDesc = groupDesc;
    }

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "groupId") //Error
    public Set<Users> getUserse() {
        return this.userse;
    }

    public void setUserse(Set<Users> users) {
        this.users = users;
    }


}

我正在映射 Users 类的正确成员变量。但我遇到了这样的异常

org.hibernate.AnnotationException: mappedBy reference an unknown target     entity property: com.project.pojo.Users.groupId in com.project.pojo.Groups.users

在用户 pojo 中，我有像角色、用户类型这样的属性，它们的映射没有任何异常。而对于组，我得到了这个异常。有人可以帮我解决这个异常吗？

谢谢:)

Answer 1

您的类用户和组的成员变量有问题将Users.pojo的变量名groupId更改为group，并将ma​​ppedby属性更改为group 在groups类中设置方法。

这将解决您的问题。