java - 错误 org.hibernate.property.BasicPropertyAccessor - IllegalArgumentException

Question

我正在使用 XML 映射。我尝试在发票和产品之间建立多对多关联(一张发票可以包含许多产品，一个产品可以属于许多发票)。我的方法是建立一个名为“InvoiceLine”的关联，其中包含单个产品、其数量和总数，并且该 InvoiceLine 将属于单个发票。 - 一张发票有很多个invoiceLines - InvoiceLine 有许多产品，并且有一个属性，该属性是与发票对应的发票 ID 在寻找进行此映射的方法时，我发现您无法与额外的列建立多对多关联，并且我需要建立 2 个一对多关联来替换该多对多关联。 这是我尝试过的，但我不断收到错误:

19359 [http-nio-8088-exec-3] ERROR org.hibernate.property.BasicPropertyAccessor - IllegalArgumentException in class: model.InvoiceLine, getter method of property: Product
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of model.InvoiceLine.Product
    at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:195)
    at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:87)
    at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:93)
    at org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:109)
    at org.hibernate.type.serComponentType.getPropertyValues(ComponentType.java:376)
    at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:207)
    at org.hibernate.engine.EntityKey.generateHashCode(EntityKey.java:126)
    at org.hibernate.engine.EntityKey.<init>(EntityKey.java:70)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:184)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:144)
    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:562)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:546)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:342)
    at com.sun.proxy.$Proxy5.save(Unknown Source)
    at dao.GenericDaoHibernateImpl.add(GenericDaoHibernateImpl.java:49)
    at dao.InvoiceLineDaoImpl.ajouter(InvoiceLineDaoImpl.java:12)
    at services.InvoiceLineServiceImpl.ajouter(InvoiceLineServiceImpl.java:25)
    at controller.InvoiceLineServlet.doPost(InvoiceLineServlet.java:123)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:169)
    ... 50 more

这是我的映射类、关联实体和 servlet。 InvoiceLine.hbm.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD//EN"
 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="model.InvoiceLine" table="INVOICE_LINE">

            <composite-id name="id" class="model.InvoiceLine">

            <key-many-to-one name="Product" entity-name="model.Product"
                column="CODE_PRODUCT" />
            <key-many-to-one name="Invoice" entity-name="model.Invoice"
                column="ID_INVOICE"/>


        </composite-id>

        <property name="qte" column="quantity" />
        <property name="total" column="TOTAL" />


    </class>
</hibernate-mapping>

产品.hbm.xml:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD//EN"
 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping>
   <class name="model.Product" table="PRODUCT">
      <meta attribute="class-description">
      </meta>
      <id name="codeProduct" column="CODE_PRODUCT">
         <generator class="native"/>
      </id>
      <property name="name" column="NAME" />
      <property name="description" column="DESCRIPTION" />
      <property name="price" column="PRICE" />
      <property name="quantityStock" column="QUANTITY_STOCK" />
      <many-to-one name="category" class="model.category" fetch="select" update="true">
            <column name="CODE_CATEGORY" not-null="true" />
      </many-to-one>


                  <set name="invoiceline" table="INVOICE_LINE" inverse="true"
            fetch="select" cascade="all">
            <key>
                <column name="CODE_PRODUCT" not-null="true" />
            </key>
            <one-to-many class="model.InvoiceLine" />
        </set>


   </class>
</hibernate-mapping>

发票.hbm.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD//EN"
 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping>
   <class name="model.Invoice" table="INVOICE">
      <meta attribute="class-description">
      </meta>
      <id name="id" column="ID_INVOICE">
         <generator class="native"/>
      </id>
      <property name="date" column="DATE" />
            <property name="total" column="TOTAL" />

      <many-to-one name="client" class="model.Client" fetch="select" update="true">
            <column name="ID_CLIENT" not-null="true" />
      </many-to-one>

                  <set name="InvoiceLine" table="INVOICE_LINE" inverse="true"
            fetch="select" cascade="all">
            <key>
                <column name="ID_INVOICE" not-null="true" />
            </key>
            <one-to-many class="model.InvoiceLine" />
        </set>


   </class>
</hibernate-mapping>

这是SERVLET

protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        if ((request.getParameter("addInvoiceLine")) != null) {

            RequestDispatcher dispatcher = request.getRequestDispatcher("/View/AddInvoiceLine.jsp");
            dispatcher.forward(request, response);
            //get the InvoiceId from a select list
            String[] invoice = request.getParameterValues("invoice");
            int codeInvoice = Integer.parseInt(invoice[0]);

            //get the ProductId from a select list
            String[] product= request.getParameterValues("product");
            int codeProd = Integer.parseInt(product[0]);
            //get the quantity from a textField and convert it to integer
            String stringQuantity = request.getParameter("quantity");
            int quantity= Integer.parseInt(stringQuantity);

            InvoiceServiceImpl InvoiceService = new InvoiceServiceImpl();
            Invoice invoice= invoiceService.return(codeInvoice);

            ProductServiceImpl productService = new ProductServiceImpl();
            Product product = productService.return(codeProd);


                InvoiceLineServiceImpl invoiceLineServiceImpl = new InvoiceLineServiceImpl();
                InvoiceLine invoiceLine= new InvoiceLine(quantity);

                invoiceLine.setProduct(product);

                invoiceLine.setInvoice(invoice);

                invoiceLineServiceImpl.add(invoiceLine);

抛出错误的行是:

        invoiceLineServiceImpl.add(invoiceLine);

方法add继承自这个GenericDao:

package dao;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

@SuppressWarnings("unchecked")
public abstract class GenericDaoHibernateImpl<E, PK extends Serializable> implements GenericDao<E, PK> {
    /**
     * By defining this class as abstract, we prevent Spring from creating
     * instance of this class If not defined as abstract,
     * getClass().getGenericSuperClass() would return Object. There would be
     * exception because Object class does not hava constructor with parameters.
     */
    protected Class<? extends E> daoType;
    public static SessionFactory sessionFactory;

    @SuppressWarnings("rawtypes")
    public GenericDaoHibernateImpl() {
        Type t = getClass().getGenericSuperclass();
        ParameterizedType pt = (ParameterizedType) t;
        daoType = (Class) pt.getActualTypeArguments()[0];
    }

    static {
        try {
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

    public static SessionFactory getSession() {
        return sessionFactory;
    }

    protected Session currentSession() {
        return getSession().getCurrentSession();
    }

    @Override
    public void add(E entity) {
        currentSession().beginTransaction();
        currentSession().save(entity);
        currentSession().getTransaction().commit();

    }

    @Override
    public void update(E entity) {
        currentSession().beginTransaction();
        currentSession().update(entity);
        currentSession().getTransaction().commit();
    }

    @Override
    public void remove(E entity) {
        currentSession().beginTransaction();
        // E oldEntity = (E) currentSession().l;
        currentSession().delete(entity);
        currentSession().getTransaction().commit();
    }

    @Override
    public E find(PK key) {
        currentSession().beginTransaction();
        return (E) currentSession().get(daoType, key);
    }

    @Override
    public List<E> getAll() {
        currentSession().beginTransaction();
        return currentSession().createCriteria(daoType).list();
    }

}

请注意，add 方法对于 Product 等其他实体非常有效，因此我认为问题在于 InvoiceLine 的 xml 映射，而不是 java 代码

这是我的InvoiceLine 实体

package model;

import java.io.Serializable;

public class InvoiceLine implements Serializable{
    private long id;
    private double total;
    public double getTotal() {
        return total;
    }
    public void setTotal(double total) {
        this.total = total;
    }
    public long getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    private Product product;
    private Invoice invoice;
    private int quantity;

    public InvoiceLine() {
        super();
    }
    public InvoiceLine(int quantity) {
        super();

        this.quantity= quantity;
    }

    public Product getProduct() {
        return product;
    }
    public void setProduct(Product product) {
        this.product = product;
    }
    public Invoice getInvoice() {
        return invoice;
    }
    public void setInvoice(Invoice invoice) {
        this.invoice= invoice;
    }
    public int getQuantity() {
        return quantity;
    }
    public void setQuantity(int quantity) {
        this.quantity= quantity;
    }



}

产品实体

package model;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

public class Product implements Serializable{

    private int codeProduct;
    private String name;
    private String description;
    private Double price;
    private int quantityStock;
    private Category category;
    private Set<InvoiceLine> invoiceLine= new HashSet<InvoiceLine>();

    public Set<InvoiceLine> getInvoiceLine() {
        return invoiceLine;
    }

    public void setInvoiceLine(Set<InvoiceLine> invoiceLine) {
        this.invoiceLine= invoiceLine;
    }

    public Product() {
    }

    public Product(String name, String description, Double price, int quantityStock) {
        this.name = name;
        this.description = description;
        this.price = price;
        this.quantityStock = quantityStock;
    }

    // getters and setters
    public int getCodeProduct() {
        return codeProduct;
    }

    public void setCodeProduct(int codeProduct) {
        this.codeProduct = codeProduct;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name= name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price= price;
    }

    public Category getCategory() {
        return category;
    }

    public void setCategory(Category category) {
        this.category = category;
    }

    public int getQuantityStock() {
        return quantityStock;
    }

    public void setQuantityStock(int quantityStock) {
        this.quantityStock = quantityStock;
    }

}

Answer 1

尝试使用 <many-to-one name="category" class="model.Category" fetch="select" update="true">在product.hbm.xml中 和

 <key-many-to-one name="product" entity-name="model.Product"
                column="CODE_PRODUCT" />

在 InvoiceLine.hbm.xml 中