OneToMany PersistentBag

Question

我遇到了与Hibernate存储OneToMany关系的问题。

我得到的是AdvertisementData实体，如下所示：

@Entity
@Table(name = "advertisement_data")
public class AdvertisementData {

@Id
@Column(name = "order_id", unique = true, nullable = false)
@GeneratedValue(generator = "gen")
@GenericGenerator(name = "gen", strategy = "foreign", parameters = @Parameter(name = "property", value = "order"))
private Long id;

@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.MERGE, mappedBy = "advertisementData")
private List<KRPData> krpData;

//setters and getters
}

和KRPData定义如下：

@Entity
public class KRPData {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

private String description;

@Type(type = "org.hibernate.type.SerializableToBlobType")
private List<String> images;

private String section;

@Type(type = "org.hibernate.type.SerializableToBlobType")
private List<String> filenames;

@ManyToOne
private AdvertisementData advertisementData;

//getters and setters
}

我可以看到两个实体都存储了，但每次我获取AdvertisementData时，结果如下：

KRPData作为PersistentBag返回，没有任何数据。

Hibernate版本：4.2.2.Final

任何想法可能是什么情况？

提前谢谢你！