使用@OneToMany或@ManyToMany来定位未映射的类，但导入似乎很好

@Entity
public class Order {
    @Id
    private Long id;
    
    @OneToMany(mappedBy = "order")
    private List<OrderItem> items;
    
    // 其他属性和方法
}

@Entity
public class OrderItem {
    @Id
    private Long id;
    
    @ManyToOne
    @JoinColumn(name = "order_id")
    private Order order;
    
    // 其他属性和方法
}

@Entity
public class User {
    @Id
    private Long id;
    
    @ManyToMany
    @JoinTable(
        name = "user_role",
        joinColumns = @JoinColumn(name = "user_id"),
        inverseJoinColumns = @JoinColumn(name = "role_id")
    )
    private List<Role> roles;
    
    // 其他属性和方法
}

@Entity
public class Role {
    @Id
    private Long id;
    
    @ManyToMany(mappedBy = "roles")
    private List<User> users;
    
    // 其他属性和方法
}