“线程中的异常”；“主要”；org.hibernate.id.IdentifierGenerationException:为类iland.hbm.BillProductDetails生成的空id

我正在尝试将数据保存在不同的表中 为此，我将主要方法写成 在这里，我想保存BillDetails bd，以及CustomerDetails cd（如果存在，则更新，否则插入）和BillProductDetails bpd，同时保存它

线程“main”org.hibernate.id.IdentifierGenerationException中的异常：为类iland.hbm.BillProductDetails生成的空id

 public static void main(String[] s) {
        BillDetails bd = new BillDetails();
        bd.setPaymentType("Cash");
        DatenTime dnt = new DatenTime();
        bd.setAddDate(dnt.getTimeStamp());
        bd.setSubTotal(400f);
        bd.setVat(20f);
        bd.setTotal(420f);
        /*Customer details*/
        CustomerDetails cd = new CustomerDetails();
        cd.setId(107L);
        cd.setName("Nita");
        cd.setAddress("India");
        cd.setDob(new Date(2014, 11, 1));
        cd.setAnniversery(new Date(2014, 11, 1));
        bd.setCustomerDetails(cd);
        /*Bill Product Details*/
        BillProductDetails bpd = new BillProductDetails();
        bpd.setQty(4);
        bpd.setSellingPrice(420.0F);
        bpd.setUnitPrice(400.0F);
        bpd.setDiscountPercent(10);
        ProductDetails pd = new ProductDetails();
        pd.setBarcode("111");
        pd.setId(1001L);
        bpd.setProductDetails(pd);
        bpd.setBillDetails(bd);
        bd.getBillProductList().add(bpd);
        BillDAO dao = new BillDAO();
        dao.insert(bd);

    }

BillDetails.hbm.xml

<hibernate-mapping>
    <class name="iland.hbm.BillDetails" table="bill_details" catalog="retail_shop">
        <id name="billNo" type="java.lang.Long">
            <column name="bill_no" />
            <generator class="identity" />
        </id>
        <many-to-one name="customerDetails" class="iland.hbm.CustomerDetails" fetch="select" cascade="all">
            <column name="customer_id" not-null="true" />
        </many-to-one>
        <many-to-one name="client" class="iland.hbm.Client" fetch="select" cascade="all">
            <column name="cid" not-null="true" />
        </many-to-one>
        <property name="subTotal" type="big_decimal">
            <column name="sub_total" precision="15" />
        </property>
        <property name="vat" type="big_decimal">
            <column name="vat" precision="15" />
        </property>
        <property name="total" type="big_decimal">
            <column name="total" precision="15" />
        </property>
        <property name="paymentType" type="string">
            <column name="payment_type" length="30" not-null="true" />
        </property>
        <property name="status" type="string">
            <column name="status" length="20" />
        </property>
        <property name="addDate" type="timestamp">
            <column name="add_date" length="19" not-null="true" />
        </property>
        <bag name="billProductList" table="bill_product_details" inverse="true" lazy="false" fetch="join" cascade="all">
            <key>
                <column name="bill_no" not-null="true" />
            </key>
            <one-to-many class="iland.hbm.BillProductDetails" />
        </bag>
        <set name="billPaidDetailses" table="bill_paid_details" inverse="true" lazy="false" fetch="join" cascade="all">
            <key>
                <column name="bill_no" not-null="true" />
            </key>
            <one-to-many class="iland.hbm.BillPaidDetails" />
        </set>
    </class>
</hibernate-mapping>

<hibernate-mapping>
    <class name="iland.hbm.BillProductDetails" table="bill_product_details" catalog="retail_shop">
        <composite-id name="id" class="iland.hbm.BillProductDetailsId">
            <key-property name="productId" type="long">
                <column name="product_id" />
            </key-property>
            <key-property name="billNo" type="long">
                <column name="bill_no" />
            </key-property>
        </composite-id>
        <many-to-one name="client" class="iland.hbm.Client" fetch="select">
            <column name="cid" not-null="true" />
        </many-to-one>
        <many-to-one name="billDetails" class="iland.hbm.BillDetails" update="false" insert="false" fetch="select">
            <column name="bill_no" not-null="true" />
        </many-to-one>
        <many-to-one name="productDetails" class="iland.hbm.ProductDetails" update="false" insert="false" fetch="select">
            <column name="product_id" not-null="true" />
        </many-to-one>
        <property name="qty" type="long">
            <column name="qty" not-null="true" />
        </property>
        <property name="unitPrice" type="big_decimal">
            <column name="unit_price" precision="15" not-null="true" />
        </property>
        <property name="sellingPrice" type="big_decimal">
            <column name="selling_price" precision="15" not-null="true" />
        </property>
        <property name="discountPercent" type="java.lang.Integer">
            <column name="discount_percent" />
        </property>
    </class>
</hibernate-mapping>

例外情况：

  Exception in thread "main" org.hibernate.id.IdentifierGenerationException: null id generated for:class iland.hbm.BillProductDetails
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:123)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
    at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:685)
    at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:677)
    at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:252)
    at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:392)
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:335)
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:425)
    at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:362)
    at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:338)
    at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:204)
    at org.hibernate.engine.Cascade.cascade(Cascade.java:161)
    at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:475)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:353)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
    at iland.bill.BillDAO.insert(BillDAO.java:30)
    at iland.bill.BillNewAction.main(BillNewAction.java:76)

如何解决这个问题

编辑： My

BillDetails

Pojo

public class BillDetails implements java.io.Serializable {

    private Long billNo;
    private CustomerDetails customerDetails;
    private Client client;
    private BigDecimal subTotal;
    private BigDecimal vat;
    private BigDecimal total;
    private String paymentType;
    private String status;
    private Timestamp addDate;
    private Set billPaidDetailses = new HashSet(0);
    private List<BillProductDetails> billProductList = new ArrayList<BillProductDetails>();
    //getter setter

你需要：

session.close();

在insert（）方法的末尾也是

确保将Cascade.ALL设置为：

• billDetails.billProductList
• billProductDetails.productDetails
• billProductDetails.billDetails

确保所有id都设置了@id和@GeneratedValue

@Id @GeneratedValue
Integer getId() { ... };

您有：

<bag name="billProductList" table="bill_product_details" inverse="true" lazy="false" fetch="join" cascade="all">
        <key>
            <column name="bill_no" not-null="true" />
        </key>
        <one-to-many class="iland.hbm.BillProductDetails" />
</bag>

<many-to-one name="billDetails" class="iland.hbm.BillDetails" update="false" insert="false" fetch="select">
        <column name="bill_no" not-null="true" />
</many-to-one>

所以，如果你选择你的包是“反向”的，你需要让多对一方控制这个关联。因此，您需要删除：

• update=“false”
• insert=“false”

从 您还可以让一对多控制，这意味着删除“inverse”属性，但这是不可取的，因为每当您更改列表内容时，它将始终删除/重新插入

---

这样，此端将能够控制关联。

我已经完成了更改。我在我的问题中添加了POJO请参见，我仍然没有看到实际的映射注释，如onetomany和manytoone，以及级联设置。请检查我更新的回答。我认为你为了忽视这种联系而不择手段。

@Id @GeneratedValue
Integer getId() { ... };

<bag name="billProductList" table="bill_product_details" inverse="true" lazy="false" fetch="join" cascade="all">
        <key>
            <column name="bill_no" not-null="true" />
        </key>
        <one-to-many class="iland.hbm.BillProductDetails" />
</bag>

<many-to-one name="billDetails" class="iland.hbm.BillDetails" update="false" insert="false" fetch="select">
        <column name="bill_no" not-null="true" />
</many-to-one>