JPA合并错误："org.hibernate.瞬态属性值异常：对象引用未保存的瞬态实例-"

Question

更新父实体时出现以下错误：请注意，在持久化新的父子实体时没有错误，只有在合并操作时才会发生错误。

组织。冬眠TransientPropertyValueException:对象引用未保存的临时实例-在刷新之前保存临时实例：

以下是我的实体结构：

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通过网络向客户端发送数据，并使用Dozer映射工具将数据从实体复制到DTO。

下面是保存Vendor及其地址的EJB方法。Cascade选项设置为CascadeType。PERSIST，因此子实体供应商地址也与父实体供应商一起保存。//正在保存新供应商，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。“级联”选项设置为“级联类型”。合并，但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());
}

原因：java。lang.IllegalStateException:org。冬眠TransientPropertyValueException:对象引用未保存的临时实例-在刷新之前保存临时实例：com。是的。企业资源计划服务器达尔。实体。供应商地址。卖主-

因此，我检查集合VendorAddress是否为空，并且是否存在于父实体Vendor中。子实体供应商地址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\u id-

InventoryServiceImpl。java:265）-供应商详情待更新-

尝试使用级联选项CascadeType。所有，得到相同的例外。是什么导致异常将其标记为瞬态实体？




Answer 1

您在供应商和供应商地址之间有双向关联。将供应商地址添加到供应商时。供应商地址您还必须致电供应商地址。设置供应商。

public void addAddressToVendor(VendorAddress address){
   this.vendorAddresses.add(address);
   address.setVendor(this)
}