Debutant probleme many to one

**taieb84** · 10/01/2010, 19h54

slt j'ai un probleme avec le many to one voici mes classes:

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package contexte;
 
public class Ecole {
private int id;
private String nom;
public Ecole() {
	super();
}
public Ecole(String nom) {
	super();
	this.nom = nom;
}
public int getId() {
	return id;
}
public void setId(int id) {
	this.id = id;
}
public String getNom() {
	return nom;
}
public void setNom(String nom) {
	this.nom = nom;
}
 
}

classe etudiant:

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package contexte;
 
public class Etudiant {
	private int id;
	private String nom;
	private Ecole ecole;
	public Etudiant() {
		super();
	}
	public Etudiant(String nom, Ecole ecole) {
		super();
		this.nom = nom;
		this.ecole = ecole;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getNom() {
		return nom;
	}
	public void setNom(String nom) {
		this.nom = nom;
	}
	public Ecole getEcole() {
		return ecole;
	}
	public void setEcole(Ecole ecole) {
		this.ecole = ecole;
	}
 
 
}

les fichiers xml de l'etudiant

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="contexte">
    <class name="Etudiant" table="ETUDIANT">
        <meta attribute="class-description">This class contains the student's address
            details.</meta>
        <id name="id" type="int" column="ETU_ID">
            <generator class="native" />
        </id>
        <property name="nom" column="ETU_NOM" type="string" length="250" />
        <many-to-one name="id" class="Ecole" not-null="true"></many-to-one>
    </class>
</hibernate-mapping>

le fichier xml de l'ecole:

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="contexte">
    <class name="Ecole" table="ECOLE">
        <meta attribute="class-description">This class contains the student's address
            details.</meta>
        <id name="id" type="int" column="ECO_ID">
            <generator class="native" />
        </id>
        <property name="nom" column="ECO_NOM" type="string" length="250" />
 
 
    </class>
</hibernate-mapping>

la classe ManageSession:

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package Session;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
 
	public class ManageSession {
		private static Session session;
		private static SessionFactory sf;
		private ManageSession()
		{
		 sf = new Configuration().configure().buildSessionFactory();
		sf.openSession();
		}
 
		public static Session getInstance(){
			if(session==null)
			{
				new ManageSession();
				session =sf.getCurrentSession();
				return session;
			}
			else 
				return session;
		}
	}

la classe test:

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package contexte;
 
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
 
import Session.ManageSession;
 
public class Test {
 
	/**
         * @param args
         */
	public static void main(String[] args) {
		Session ss=ManageSession.getInstance();
		Transaction tx=null;
		try
		{
		tx=ss.beginTransaction();
		Ecole e1 =new Ecole("e");
		Etudiant e=new Etudiant("hh",e1);
 
 
		ss.save(e);
		tx.commit();
 
		} catch (HibernateException e) {
            tx.rollback();
            e.printStackTrace();
        } finally {
            ss.close();
        }
}
}

le fichier xml de configuration hibernate.cfg.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
		"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
		"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">root</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/base</property>
        <property name="hibernate.connection.username">root</property>
 
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
 
        <property name="hbm2ddl.auto">create</property>		
<property name="hibernate.show_sql">true</property>	
	<property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
		<property name="current_session_context_class">thread</property>
 
 
	<mapping resource="contexte/Etudiant.hbm.xml"/>
	<mapping resource="contexte/Ecole.hbm.xml"/>
			</session-factory>
		</hibernate-configuration>

apres l'execution il me genere ces erreurs :

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log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of contexte.Ecole.id
	at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:195)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:199)
	at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3605)
	at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3321)
	at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:204)
	at org.hibernate.engine.ForeignKeys$Nullifier.isNullifiable(ForeignKeys.java:160)
	at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:92)
	at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:70)
	at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:311)
	at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
	at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
	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:563)
	at org.hibernate.impl.SessionImpl.save(SessionImpl.java:551)
	at org.hibernate.impl.SessionImpl.save(SessionImpl.java:547)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:342)
	at $Proxy0.save(Unknown Source)
	at contexte.Test.main(Test.java:24)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:169)
	... 25 more
Exception in thread "main" org.hibernate.SessionException: Session was already closed
	at org.hibernate.impl.SessionImpl.close(SessionImpl.java:303)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:342)
	at $Proxy0.close(Unknown Source)
	at contexte.Test.main(Test.java:31)

**sicard_51** · 12/01/2010, 13h52

Je pense que tu as un souci dans ton mapping de la classe Etudiant :

<many-to-one name="ecole" class="Ecole" not-null="true"></many-to-one>

**taieb84** · 13/01/2010, 17h14

merci oui effectivement j'ai modifie le nom de l'attribut et le programme a fonctionné

Debutant probleme many to one

Hibernate Java

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