Erreur "java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number"

**oufou** · 20/01/2015, 08h17

Bonjour tous;
J'ai une erreur qui apparait lors de developpement d'une application j2ee, j'utilise jpa et jsf.L'erreur apparait lors de l'ajourt(action ajouter) ," java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number". voici les codes xhtml et le bean:

Code :

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:composite="http://java.sun.com/jsf/composite">
<head>
</head>
<body>
<h2> INFORMATIONS DEPARTEMENT </h2>
<hr /><hr />
<h:form> 
<h:panelGrid columns="2" cellpadding="2" >
NOM : <h:inputText   value ="#{deprtBean.dep.nomdepart}"/>
    <br /> <br />
 
<h:commandButton value="Ajouter" action="#{deprtBean.ajouter }"/>
 		</h:panelGrid>
</h:form>
</body>
</html>

le bean correspondant est :

Code :

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package com.xx.personne.controlleur;
 
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import com.xx.personne.dao.deprtdao;
import com.xx.personne.persistence.deprt;
 
@ManagedBean
@SessionScoped
public class deprtBean {
 
	private deprt dep=new deprt();
	deprtdao depdao=new deprtdao();
	public deprtBean() {
		// TODO Auto-generated constructor stub
	}
	public deprt getDep() {
		return dep;
	}
	public void setDep(deprt dep) {
		this.dep = dep;
	}
/***************************/
	public String ajouter(){
		depdao.ajouter(dep);
		return null;
		}
}

Le dao :

Code :

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package com.xx.personne.dao;
 
import java.util.List;
 
import javax.persistence.EntityManager;
import javax.persistence.Persistence;
 
import com.xx.personne.persistence.deprt;
 
public class deprtdao {
	private deprt dep=new deprt();
	private EntityManager ed;
 
	public deprtdao() {
		// TODO Auto-generated constructor stub
	}
 
	public deprt getDep() {
		return dep;
	}
 
	public void setDep(deprt dep) {
		this.dep = dep;
	}
 
	public EntityManager getEd() {
		if(ed==null)
			ed=Persistence.createEntityManagerFactory("Personne").createEntityManager();
		return ed;
	}
 
	public void ajouter(deprt dep){
	 getEd().getTransaction().begin();
		getEd().persist(dep);
		getEd().getTransaction().commit();
	}
 
	public void modifier(deprt dep) {
		// TODO Auto-generated method stub
		getEd().getTransaction().begin();
		getEd().merge(dep);
		getEd().getTransaction().commit();
	}
 
	public void supprimer(deprt dep) {
		// TODO Auto-generated method stub
		getEd().getTransaction().begin();
		getEd().remove(dep);
		getEd().getTransaction().commit();
	}
	public List<deprt>  selectAll(){
		try {
			@SuppressWarnings("unchecked")
			List<deprt> resultList = getEd().createQuery("select dep  from deprt dep").getResultList();
			return resultList;
 
		} catch (Exception e) {
			return null;
			// TODO: handle exception
		}
	}
 
	public deprt  selectBynom(String nomdepr){
		try {
			deprt resultList = (deprt) getEd().createQuery("select dep  from deprt dep where dep.nom=:pp").setParameter("pp", nomdepr).getSingleResult();
			return resultList;
 
		} catch (Exception e) {
			return null;
			// TODO: handle exception
		}
}
}

Je ne sais pas ou il se realise le cast exactement!!

merci pour votre aide

**Maine13** · 20/01/2015, 08h59

Bonjour,

(Pour �tre un bon d�veloppeur il est tr�s conseiller d'apprendre les conventions de base de Java. Exemple: la premi�re lettre d'une classe s'�crit toujours en majuscule ainsi que la premi�re lettre d'un nom compos�).
Sinon l'erreur semble clair. Tu es entrain d'affecter un String dans un Number !!
Pourrais tu nous partager la classe(le mod�le) que tu es entrain d�ins�rer "deprt "??

**oufou** · 20/01/2015, 09h06

merci pour ta reponse.ok voici le code de deprt:

Code :

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package com.xx.personne.persistence;
 
import java.util.List;
 
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import static javax.persistence.CascadeType.PERSIST;
 
@Entity
public class deprt {
 
private int iddepart;
private String nomdepart;
private List<personnel> perslist;
	public deprt() {
 
		// TODO Auto-generated constructor stub
	}
	public String getNomdepart() {
		return nomdepart;
	}
	public void setNomdepart(String nomdepart) {
		this.nomdepart = nomdepart;
	}
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	public int getIddepart() {
		return iddepart;
	}
	public void setIddepart(int iddepart) {
		this.iddepart = iddepart;
	}
	@OneToMany(cascade = PERSIST)
	public List<personnel> getPerslist() {
		return perslist;
	}
	public void setPerslist(List<personnel> perslist) {
		this.perslist = perslist;
	}
 
}

**oufou** · 20/01/2015, 09h46

Je ne sais si c'est correct, mais l'erreur est due � une table " sequence" qui se genere automatiqument

comment arreter sa generation? voici une trace du message d'eclipse:

Code :

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[TopLink Fine]: 2015.01.20 09:37:27.815--ClientSession(24286958)--Connection(4618022)--Thread(Thread[http-bio-8080-exec-3,5,main])--SELECT SEQ_COUNT FROM SEQUENCE WHERE SEQ_NAME = ?
	bind => [SEQ_GEN]
[TopLink Warning]: 2015.01.20 09:37:27.862--UnitOfWork(33217484)--Thread(Thread[http-bio-8080-exec-3,5,main])--java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
janv. 20, 2015 9:37:27 AM com.sun.faces.lifecycle.InvokeApplicationPhase execute
AVERTISSEMENT: #{deprtBean.ajouter }: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
javax.faces.FacesException: #{deprtBean.ajouter }: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:117)
	at javax.faces.component.UICommand.broadcast(UICommand.java:315)
	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:791)
	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1256)
	at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:409)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1044)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.el.EvaluationException: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)
	... 26 more
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
	at oracle.toplink.essentials.sequencing.QuerySequence.updateAndSelectSequence(QuerySequence.java:269)
	at oracle.toplink.essentials.sequencing.StandardSequence.getGeneratedVector(StandardSequence.java:81)
	at oracle.toplink.essentials.sequencing.DefaultSequence.getGeneratedVector(DefaultSequence.java:153)
	at oracle.toplink.essentials.sequencing.Sequence.getGeneratedVector(Sequence.java:266)
	at oracle.toplink.essentials.internal.sequencing.SequencingManager$Preallocation_Transaction_NoAccessor_State.getNextValue(SequencingManager.java:404)
	at oracle.toplink.essentials.internal.sequencing.SequencingManager.getNextValue(SequencingManager.java:832)
	at oracle.toplink.essentials.internal.sequencing.ClientSessionSequencing.getNextValue(ClientSessionSequencing.java:95)
	at oracle.toplink.essentials.internal.descriptors.ObjectBuilder.assignSequenceNumber(ObjectBuilder.java:225)
	at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.assignSequenceNumber(UnitOfWorkImpl.java:341)
	at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNotRegisteredNewObjectForPersist(UnitOfWorkImpl.java:3255)
	at oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.registerNotRegisteredNewObjectForPersist(RepeatableWriteUnitOfWork.java:323)
	at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:3206)
	at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(EntityManagerImpl.java:190)
	at com.xx.personne.dao.deprtdao.ajouter(deprtdao.java:34)
	at com.xx.personne.controlleur.deprtBean.ajouter(deprtBean.java:24)
	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.apache.el.parser.AstValue.invoke(AstValue.java:278)
	at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
	at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)

**jeffray03** · 20/01/2015, 09h50

salut,
peux-tu nous afficher le contenu de l�objet dep avant la persistence?

Eric

**jeffray03** · 20/01/2015, 09h54

tu utilises quoi comme base de donn�es?

**jeffray03** · 20/01/2015, 09h58

si tu utilises Oracle,
alors c�est plutot ceci:

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@Id
    @SequenceGenerator(name="seq", initialValue=1, allocationSize=100)
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="seq")  
    private Integer iddepart;

ou seq est le nom de ta sequence.

Si c�est MySQL alors:

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    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer iddepart;

en ayant bien sur mis iddepart dans ta base en auto_increment.

Eric

**oufou** · 20/01/2015, 10h33

ah, c bon , l'erreur a �t� AUTO mais la correcte forme est
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)

Erreur "java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number"

JSF Java

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