我有一个使用JPA的Spring Boot 项目，所以我尝试使用两个表的ID将它们Map到第三个表中：例如，我有一个coupon类，我有一个customer类，我想把customer id和coupon id放到第三个表中。
我有优惠券：

@Entity
@Table(name = "coupons")
public class Coupon {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)

    private long coup_id;
    private String title;
    private String start;
    private String end; 
    private int amount; 
    private String type;
    private String message; 
    private double price;
    private String image;

    @ManyToMany(mappedBy = "coupons")
    private List<Customer> customers;

我有客户：

@Entity
@Table(name="customers")
public class Customer {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)

    private int cust_id;

    @Size(min=1,message="is required")
    private String cust_name;

    @Size(min = 1, message = "is required")
    private String password;
     @ManyToMany(cascade = { CascadeType.ALL })
        @JoinTable(
            name = "customer_coupon", 
            joinColumns = { @JoinColumn(name = "cust_id") }, 
            inverseJoinColumns = { @JoinColumn(name = "coup_id") }
        )
    private List<Coupon> coupons;

我有一个连接表customer_coupon：

这是我在启动项目时遇到的错误：

Caused by: org.hibernate.DuplicateMappingException: Table [coupons] contains physical column name [coup_id] referred to by multiple physical column names: [coupId], [coup_id]

我不知道它是从哪里来的，如果有人能帮助我，我会很高兴的！