Jpa 没有为此实体层次结构定义ID

每次我想添加与另一个实体类的多通关系时，都会出现此错误消息

该类必须使用一致的访问类型（字段或属性）。没有为此实体层次结构定义ID

这是我的实体交易

@Entity
@Table(name = "CustomerTransaction")
public class CustomerTransaction  implements Serializable {//this is the line with the error message
    @Id


    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
         @ManyToOne //This generates the problem
    @JoinColumns({
            @JoinColumn(name = "CUS_ID", referencedColumnName = "IDCUSTOMER") })


    public Long getId() {
        return id;
    }

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





    private long transactionID;
    @Temporal(TemporalType.TIMESTAMP)
    private Date buyDate;

    public Date getBuyDate() {
        return buyDate;
    }

    public void setBuyDate(Date buyDate) {
        this.buyDate = buyDate;
    }



    public long getTransactionID() {
        return transactionID;
    }

    public void setTransactionID(long transactionID) {
        this.transactionID = transactionID;
    }







    public String getCarYear() {
        return carYear;
    }

    public void setCarYear(String carYear) {
        this.carYear = carYear;
    }

    public Date getTransactionDate() {
        return transactionDate;
    }

    public void setTransactionDate(Date transactionDate) {
        this.transactionDate = transactionDate;
    }
    private String carYear;
    @Temporal(TemporalType.TIMESTAMP)
    private Date transactionDate;

---

JPA注释应该全部放在字段或访问器方法上。您已将

@Id

和

@GeneratedValue

注释放置在字段（

专用长Id

）上，但将

@manytone

和

@JoinColumns

放置在getter（

公共长getId（）

）上。将后者也移动到场地上