更新父实体时出现以下错误：
请注意，在保留新的父子实体时没有错误，仅在合并操作时发生错误。
org.hibernate.TransientPropertyValueException：对象引用了一个未保存的临时实例-在刷新之前保存该临时实例：
这是我的实体结构：
public class Vendor implements Serializable {
private static final long serialVersionUID = 4681697981214145859L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "vendor_id")
private Long vendorId;
@Column(name = "biz_type")
private String bizType;
...
@OneToMany(mappedBy = "vendor", fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST, CascadeType.MERGE })
private Set<VendorAddress> vendorAddresses;
}
> public class VendorAddress implements Serializable {
private static final long serialVersionUID = 227762450606463794L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "vendor_adrs_id")
private Long vendorAdrsId;
@Column(name = "vend_adrs_ordinal")
private Integer vendAdrsOrdinal;
// bi-directional many-to-one association to City
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "city_id")
private City city;
// bi-directional many-to-one association to State
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "state_id")
private State state;
// bi-directional many-to-one association to Country
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "country_id")
private Country country;
....
// bi-directional many-to-one association to Vendor
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "vendor_id")
private Vendor vendor;
}
使用DTO通过网络将数据发送到客户端和推土机映射工具，以将数据从实体复制到DTO。
这是用于保留供应商及其地址的EJB方法。 Cascade选项设置为CascadeType.PERSIST，因此子实体VendorAddress也将与父实体Vendor一起保存。
//新的供应商一直存在，没有任何错误。
@Override
public VendorTO saveVendor(VendorTO vendorTo) throws ErpMiniAppException {
if (vendorTo.getVendorAddresses() != null) {
Iterator<VendorAddressTO> iter = vendorTo.getVendorAddresses().iterator();
if (iter.hasNext()) {
VendorAddressTO addressTo = iter.next();
addressTo.setVendAdrsOrdinal(1); // for new Vendor, address ordinal starts with 1
} else
throw new ErpMiniAppException("Address details no associated with Vendor.");
} else {
throw new ErpMiniAppException("Address details no associated with Vendor.");
}
Vendor vendor = (Vendor) ErpMiniMapper.getEntity(vendorTo, new Vendor());
Vendor persistedVendor = daoFactory.getVendorDAO().insert(vendor);
_logger.debug("InventoryServiceImpl :: saveVendor() new Entity inserted success!");
return (VendorTO) ErpMiniMapper.getTO(persistedVendor, new VendorTO());
}
更新供应商及其地址的EJB方法。 Cascade选项设置为CascadeType.MERGE，但是在提交事务期间引发异常。
@Override
public VendorTO updateVendor(VendorTO vendorTo) throws ErpMiniAppException {
_logger.debug("VendorTO details to be updated -> " + vendorTo.toString());
Vendor vendor = (Vendor) ErpMiniMapper.getEntity(vendorTo, new Vendor());
Vendor updatedVendor = daoFactory.getVendorDAO().update(vendor);
_logger.debug("Entity updated success!");
return (VendorTO) ErpMiniMapper.getTO(updatedVendor, new VendorTO());
}
造成原因：
java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.itsys.erp.server.dal.entities.VendorAddress.vendor -> com.itsys.erp.server.dal.entities.Vendor.因此，我检查集合VendorAddress是否为空，并且是否存在于父实体Vendor中。子实体VendorAddress存在于父实体供应商中，因为您可以看到两个主键都存在：
vendor_id-> 9 and vendor_address_id-> 28.这是日志调试信息：
InventoryServiceImpl.java:265) - VendorTO details to be updated -> vendor_id-> 9 name-> Tetra Pak India Pvt. Ltd. email -> [email protected] phone -> 02135 678 101 / 1800 1555 4488 biz type-> MFG vendor code-> tetrapak Address Details ->19:14:46,860 INFO [stdout] (default task-1) vendor_address_id-> 28 ordinal-> 1 vendor Address Type-> Manufacturing address_1-> Plot No 53, MIDC Chakan Phase 2, address_2-> Village Vasuli, Tal Khed, contact-> 02135 678101 / 02135 661801 vendor email ID-> [email protected] vendor info->尝试使用级联选项CascadeType.ALL来获得相同的异常。
是什么导致异常将其标记为临时实体？
最佳答案
您在Vendor和VendorAddresses之间具有双向关联。将VendorAddress添加到Vendor.vendorAddresses时，还必须调用VendorAdress.setVendor。
public void addAddressToVendor(VendorAddress address){
this.vendorAddresses.add(address);
address.setVendor(this)
}