failed to lazily initialize a collection of role

**dalitobs** · 11/05/2016, 15h10

Bonjour,
Comme j'ai mentionné dans le titre j'ai eu cette erreur par ce que j'ai essayé d'afficher la liste des tests avec leurs questions je pense que c'est une erreur de Mapping.
Classe question

Code :

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package tn.esen.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
 
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
 
import java.io.Serializable;
import java.util.Collection;
import java.util.Date;
@Entity
public class Question implements Serializable {
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((contenu == null) ? 0 : contenu.hashCode());
		result = prime * result + ((dateCreation == null) ? 0 : dateCreation.hashCode());
		result = prime * result + ((niveauDeDifficulte == null) ? 0 : niveauDeDifficulte.hashCode());
		return result;
	}
 
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Question other = (Question) obj;
		if (contenu == null) {
			if (other.contenu != null)
				return false;
		} else if (!contenu.equals(other.contenu))
			return false;
		if (dateCreation == null) {
			if (other.dateCreation != null)
				return false;
		} else if (!dateCreation.equals(other.dateCreation))
			return false;
		if (niveauDeDifficulte == null) {
			if (other.niveauDeDifficulte != null)
				return false;
		} else if (!niveauDeDifficulte.equals(other.niveauDeDifficulte))
			return false;
		return true;
	}
 
	/**
         * 
         */
	private static final long serialVersionUID = 1L;
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	@Column(name="id_question")		
	private int id;
    private String contenu;    
	private String niveauDeDifficulte;
        private Date dateCreation;
        @OneToMany(mappedBy="question",fetch = FetchType.EAGER)
        private Collection <Reponse> reponses; 
        @ManyToOne
         private Categorie categorie;
        @ManyToOne
         private Administrateur administrateur;
        @ManyToMany(mappedBy = "questions",fetch = FetchType.EAGER)
        private Collection<Test> tests;
public Question(){
	super();
}
 
@Override
public String toString() {
	return "Question [id=" + id + ", contenu=" + contenu + ", niveauDeDifficulte=" + niveauDeDifficulte + "]";
}
 
public int getId() {
	return id;
}
 
public void setId(int id) {
	this.id = id;
}
 
 
public String getContenu() {
	return contenu;
}
 
public void setContenu(String contenu) {
	this.contenu = contenu;
}
 
public String getNiveauDeDifficulte() {
	return niveauDeDifficulte;
}
 
public void setNiveauDeDifficulte(String niveauDeDifficulte) {
	this.niveauDeDifficulte = niveauDeDifficulte;
}
 
 
public Date getDateCreation() {
	return dateCreation;
}
 
public void setDateCreation(Date dateCreation) {
	this.dateCreation = dateCreation;
}
 
 
public Collection<Reponse> getReponses() {
	return reponses;
}
 
public void setReponses(Collection<Reponse> reponses) {
	this.reponses = reponses;
}
 
public Categorie getCategorie() {
	return categorie;
}
 
public void setCategorie(Categorie categorie) {
	this.categorie = categorie;
}
 
public Administrateur getAdministrateur() {
	return administrateur;
}
 
public void setAdministrateur(Administrateur administrateur) {
	this.administrateur = administrateur;
}
 
public Collection<Test> getTest() {
	return tests;
}
 
public void setTest(Collection<Test> tests) {
	this.tests = tests;
}
 
public Question(String contenu, String niveauDeDifficulte, Date dateCreation) {
	super();
	this.contenu = contenu;
	this.niveauDeDifficulte = niveauDeDifficulte;
	this.dateCreation = dateCreation;
}
 
 
 
 
 
 
}

classe test

Code :

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package tn.esen.entities;
 
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
 
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
 
import java.io.Serializable;
import java.util.Collection;
 
@Entity
public class Test implements Serializable {
	/**
         * 
         */
	private static final long serialVersionUID = 1L;
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private int id;
	private String duree;
	private String typeDePreparation;
	private String lieu;
	private int nbrQuestionFacile;
	private int nbrQuestionMoyen;
	private int nbrQuestionDifficle;
	@OneToMany(mappedBy = "test")
	private Collection<Resultat> resultats;
	@ManyToMany
	private Collection<Question> questions;
 
	@ManyToOne
	private ResponsableTechnique responsableTechnique;
 
	public Test() {
		super();
	}
 
	public int getId() {
		return id;
	}
 
	public void setId(int id) {
		this.id = id;
	}
 
 
 
	public String getDuree() {
		return duree;
	}
 
	public void setDuree(String duree) {
		this.duree = duree;
	}
 
	public Collection<Question> getQuestions() {
		return questions;
	}
 
	public void setQuestions(Collection<Question> questions) {
		this.questions = questions;
	}
 
	public Test(String duree, String typeDePreparation, String lieu, int nbrQuestionFacile, int nbrQuestionMoyen,
			int nbrQuestionDifficle) {
		super();
		this.duree = duree;
		this.typeDePreparation = typeDePreparation;
		this.lieu = lieu;
		this.nbrQuestionFacile = nbrQuestionFacile;
		this.nbrQuestionMoyen = nbrQuestionMoyen;
		this.nbrQuestionDifficle = nbrQuestionDifficle;
	}
 
	public ResponsableTechnique getRésponsableTechnique() {
		return responsableTechnique;
	}
 
	public void setRésponsableTechnique(ResponsableTechnique résponsableTechnique) {
		this.responsableTechnique = résponsableTechnique;
	}
 
	public String getTypeDePreparation() {
		return typeDePreparation;
	}
 
	public void setTypeDePreparation(String typeDePreparation) {
		this.typeDePreparation = typeDePreparation;
	}
 
	public String getLieu() {
		return lieu;
	}
 
	public void setLieu(String lieu) {
		this.lieu = lieu;
	}
 
	public int getNbrQuestionFacile() {
		return nbrQuestionFacile;
	}
 
	public void setNbrQuestionFacile(int nbrQuestionFacile) {
		this.nbrQuestionFacile = nbrQuestionFacile;
	}
 
	public int getNbrQuestionMoyen() {
		return nbrQuestionMoyen;
	}
 
	public void setNbrQuestionMoyen(int nbrQuestionMoyen) {
		this.nbrQuestionMoyen = nbrQuestionMoyen;
	}
 
	public int getNbrQuestionDifficle() {
		return nbrQuestionDifficle;
	}
 
	public void setNbrQuestionDifficle(int nbrQuestionDifficle) {
		this.nbrQuestionDifficle = nbrQuestionDifficle;
	}
 
	public Collection<Resultat> getResultats() {
		return resultats;
	}
 
	public void setRésultats(Collection<Resultat> resultats) {
		this.resultats = resultats;
	}
 
}

et voilà l’erreur

Code :

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mai 11, 2016 2:57:08 PM org.xnio.Xnio <clinit>
INFO: XNIO version 3.3.1.Final
mai 11, 2016 2:57:14 PM org.xnio.nio.NioXnio <clinit>
INFO: XNIO NIO Implementation Version 3.3.1.Final
mai 11, 2016 2:57:15 PM org.jboss.remoting3.EndpointImpl <clinit>
INFO: JBoss Remoting version 4.0.9.Final
mai 11, 2016 2:57:20 PM org.jboss.ejb.client.remoting.VersionReceiver handleMessage
INFO: EJBCLIENT000017: Received server version 2 and marshalling strategies [river]
mai 11, 2016 2:57:21 PM org.jboss.ejb.client.remoting.RemotingConnectionEJBReceiver associate
INFO: EJBCLIENT000013: Successful version handshake completed for receiver context EJBReceiverContext{clientContext=org.jboss.ejb.client.EJBClientContext@4a0ef907, receiver=Remoting connection EJB receiver [connection=Remoting connection <5d15fce5>,channel=jboss.ejb,nodename=daly-pc]} on channel Channel ID c53cfcba (outbound) of Remoting connection 3584f732 to localhost/127.0.0.1:8383
mai 11, 2016 2:57:22 PM org.jboss.ejb.client.EJBClient <clinit>
INFO: JBoss EJB Client version 2.1.1.Final
Exception in thread "AWT-EventQueue-0" org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: tn.esen.entities.Test.questions, could not initialize proxy - no Session
	at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:575)
	at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:214)
	at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:554)
	at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:142)
	at org.hibernate.collection.internal.PersistentBag.toString(PersistentBag.java:526)
	at javax.swing.table.DefaultTableCellRenderer.setValue(Unknown Source)
	at javax.swing.table.DefaultTableCellRenderer.getTableCellRendererComponent(Unknown Source)
	at javax.swing.JTable.prepareRenderer(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
	at javax.swing.plaf.ComponentUI.update(Unknown Source)
	at javax.swing.JComponent.paintComponent(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JViewport.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JViewport.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JLayeredPane.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintToOffscreen(Unknown Source)
	at javax.swing.BufferStrategyPaintManager.paint(Unknown Source)
	at javax.swing.RepaintManager.paint(Unknown Source)
	at javax.swing.JComponent._paintImmediately(Unknown Source)
	at javax.swing.JComponent.paintImmediately(Unknown Source)
	at javax.swing.RepaintManager$4.run(Unknown Source)
	at javax.swing.RepaintManager$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.access$1200(Unknown Source)
	at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$500(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

**JeitEmgie** · 18/05/2016, 14h32

Envoyé par dalitobs

Bonjour,
Comme j'ai mentionné dans le titre j'ai eu cette erreur par ce que j'ai essayé d'afficher la liste des tests avec leurs questions je pense que c'est une erreur de Mapping.
et voilà l’erreur

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
Exception in thread "AWT-EventQueue-0" org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: tn.esen.entities.Test.questions, could not initialize proxy - no Session
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:575)

LazyInitializationException == vous essayez de charger des données en dehors d'un contexte transactionnel ou d'une Session Hibernate.

Par ailleurs déclarer vos @Entity implements Serializable alors que des champs sont des interfaces (Collection) ne sert à rien : le contrat n'est pas respecté.
Et de toute façon avec un ORM les collections seront des proxies qui sont rarement serializable.

failed to lazily initialize a collection of role

Hibernate Java

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