我在被注释的对象中建立一对多关系时遇到问题。

我有以下几点：

@MappedSuperclass
public abstract class MappedModel
{
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id",nullable=false,unique=true)
    private Long mId;

然后这个

@Entity
@Table(name="customer")
public class Customer extends MappedModel implements Serializable
{

    /**
   * 
   */
  private static final long serialVersionUID = -2543425088717298236L;


  /** The collection of stores. */
    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
  private Collection<Store> stores;

和这个

@Entity
@Table(name="store")
public class Store extends MappedModel implements Serializable
{

    /**
   * 
   */
  private static final long serialVersionUID = -9017650847571487336L;

  /** many stores have a single customer **/
  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn (name="customer_id",referencedColumnName="id",nullable=false,unique=true)
  private Customer mCustomer;

我在这里做错了什么