如何使用Spring Batch HibernateItemWriter来持久映射实体？

Question

我正在尝试编写一个Spring批处理作业来解析嵌套的XML，并使用Hibernate将数据保存到多个表中。我能够使用StaxEventItemReader解组xml。我尝试使用HibernateItemWriter来保存数据，但这只保存顶级实体'Shipment'，而不是映射实体'Party'。

这是我的xml

<Shipment>
<TransactionId>000551070008555</TransactionId>
<TransactionSetPurpose>Replace</TransactionSetPurpose>
<TransactionType>Customer</TransactionType>
<Parties>
 <Party>
   <PartyType>Account</PartyType>
   <PartyCode>933334</PartyCode>
   <Name>AT HOME</Name>
 </Party>
 <Party>
   <PartyType>Shipper</PartyType>
   <PartyCode>CVASIH</PartyCode>
   <Name>CV.WIDHI ASIH BALI EXPORT</Name>
 </Party>
<Parties>
</Shipment>

我的处理器类

public class ShipmentItemProcessor implements ItemProcessor<Shipment, 
Shipment> {

@Override
public Shipment process(Shipment result) throws Exception {
    System.out.println("Processing result :"+result);

    Set<Party> partySet = new HashSet<Party>();
    partySet.addAll(result.getParties().getParty());
    result.setPartySet(partySet);

    return result;
}
}

如何从处理器返回我的Party Set以及Shipment到HibernateItemWriter？

装运

@XmlRootElement(name = "Shipment")
@Entity
public class Shipment{

protected String transactionId;
protected String transactionSetPurpose;
protected String transactionType;
@Id
protected String fileNumber;
@Transient
protected Parties parties;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "shipment")
private Set<Party> partySet = new HashSet<Party>(0); 

--getters and setters

}

方

@Entity
@XmlRootElement(name = "Party")
public class Party {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
protected int id;
protected String partyType;
protected String partyCode;
protected String name;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "fileNumber", nullable = false)
protected Shipment shipment;
--getters and setters
}