Ошибка org.hibernate.property. basicpropertyaccessor - illegalargumentexception

---

Я использую XML-отображение. Я попытался создать связь "многие ко многим" между счетом-фактурой и продуктом (счет-фактура может содержать много продуктов, а продукт может принадлежать многим счетам-фактурам). Мой подход состоял в том, чтобы создать ассоциацию под названием "InvoiceLine", которая будет содержать один продукт, его количество и общую сумму, и эта InvoiceLine будет принадлежать одному счету-фактуре.
- Счет-фактура имеет много линий счетов-фактур
- Строка счета-фактуры имеет много продуктов и имеет атрибут, который является идентификатором счета-фактуры, соответствующим счету-фактуре
В поисках способа сделать это сопоставление я пришел к выводу, что вы не можете сделать ассоциацию "многие ко многим" с дополнительным столбцом и что мне нужно сделать 2 ассоциации "один ко многим", чтобы заменить эту ассоциацию "многие ко многим".

Что я уже пробовал:

Это то, что я пытался, но я продолжаю получать ошибку:

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

Вот мои классы отображения, сущность ассоциации и сервлет.
**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>

**Product.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>

**Invoice.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>

А это и есть * * сервлет**

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);

Строка, которая выдает ошибку, такова:

invoiceLineServiceImpl.add(invoiceLine);

**метод add наследуется от этого 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();
    	}
    
    }

**Обратите внимание, что метод add отлично работает для других сущностей, таких как Product, так что это заставило меня подумать, что проблема заключается в xml-отображении Invoiceline, а не в java-коде**

Это моя сущность * * InvoiceLine**

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;
    	}
    	
    	
    
    }

** Сущность продукта**

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;
    	}
    
    }

---