No getter method available for property

Bonjour,
j'ai besoin d'aide SVP ,je veux initialiser une liste (HashSet) d'objet à partir d'une jsp mais j'ai l'erreur suivante:

Citation:

exception

javax.servlet.ServletException: org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: No getter method available for property dateDebut for bean under name org.apache.struts.taglib.html.BEAN
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

cause mère

org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: No getter method available for property dateDebut for bean under name org.apache.struts.taglib.html.BEAN
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:491)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:401)

voici mes ressources:
creer_cv.jsp

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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="html" uri="http://struts.apache.org/tags-html"%>
<%@taglib prefix="nested" uri="http://struts.apache.org/tags-nested" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascript">
 
</script>
</head>
<body>
<html:form action="/creer_cv2.do" method="post">
	<table>
		<tr>
			<td>Titre CV: <html:text property="titreCv" name="cv" /></td>
		</tr>
		<tr>
			<td>
			<fieldset><legend>Formations:</legend>
			<table>
				<tr>
					<td>Date Début</td>
					<td>Date Fin</td>
					<td>Ou à aujourdhui</td>
				</tr>
				<tr>
					<td>
	<html:text property="formations.dateDebut" name="cv" /></td>
	<td><html:text property="formations.dateFin" name="cv" /></td>
					<td><html:checkbox property="formations.dateFin" name="cv" /></td>
				</tr>
				<tr>
					<td>Nom Formation</td>
					<td>Type de Formation</td>
					<td>Niveau Formation</td>
				</tr>
				<tr>
					<td><html:text property="formations.titreFormation" name="cv" /></td>
					<td><html:text
						property="formations.typeFormation.libelleTypeFormation" name="cv" /></td>
					<td><html:text
						property="formations.nvFormation.libelleNvFormation" name="cv" /></td>
				</tr>
				<tr>
					<td>Etablisement</td>
					<td>Ville</td>
					<td>Pays</td>
				</tr>
				<tr>
					<td><html:text property="formations.etablissement" name="cv" /></td>
					<td><html:text property="formations.ville" name="cv" /></td>
					<td><html:text property="formations.paye" name="cv" /></td>
				</tr>
				<tr>
					<td colspan="3">Description Formation</td>
				</tr>
				<tr>
					<td colspan="3"><html:textarea
						property="formations.descriptionFormation" name="cv"
						style="width : 571px; height : 70px;" /></td>
				</tr>
				<tr>
					<td><html:submit value="Valider" /> <html:link
						href="creer_cv.do" /></td>
				</tr>
			</table>
			</fieldset>
			</td>
		</tr>
		<tr>
			<td></td>
		</tr>
		<tr>
			<td></td>
		</tr>
		<tr>
			<td></td>
		</tr>
		<tr>
			<td></td>
		</tr>
	</table>
</html:form>
</body>
</html>

Cv.java

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package modeles_candidat;
 
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
 
import modeles_generale.Langue;
 
public class Cv {
	private String titreCv;
	private Date dateCreationCv;
	private Date dateModificationCv;
	private String cheminCv;
	private String competences;
	private String divers;
	private Set<Formation> formations = new HashSet<Formation>();
 
	public Cv() {
		// TODO Auto-generated constructor stub
	}
 
	public Cv(String titreCv, Date dateCreationCv, Date dateModificationCv,
			String cheminCv, String competences, String divers,
			Set<Formation> formations) {
		super();
		this.titreCv = titreCv;
		this.dateCreationCv = dateCreationCv;
		this.dateModificationCv = dateModificationCv;
		this.cheminCv = cheminCv;
		this.competences = competences;
		this.divers = divers;
		this.formations = formations;
 
	}
 
	public String getTitreCv() {
		return titreCv;
	}
 
	public void setTitreCv(String titreCv) {
		this.titreCv = titreCv;
	}
 
	public Date getDateCreationCv() {
		return dateCreationCv;
	}
 
	public void setDateCreationCv(Date dateCreationCv) {
		this.dateCreationCv = dateCreationCv;
	}
 
	public Date getDateModificationCv() {
		return dateModificationCv;
	}
 
	public void setDateModificationCv(Date dateModificationCv) {
		this.dateModificationCv = dateModificationCv;
	}
 
	public String getCheminCv() {
		return cheminCv;
	}
 
	public void setCheminCv(String cheminCv) {
		this.cheminCv = cheminCv;
	}
 
	public String getCompetences() {
		return competences;
	}
 
	public void setCompetences(String competences) {
		this.competences = competences;
	}
 
	public String getDivers() {
		return divers;
	}
 
	public void setDivers(String divers) {
		this.divers = divers;
	}
 
	public Set<Formation> getFormations() {
		return formations;
	}
 
	public void setFormations(Set<Formation> formations) {
		this.formations = formations;
	}
}

Formation.java

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package modeles_candidat;
 
// Generated 29 juil. 2010 14:21:09 by Hibernate Tools 3.2.2.GA
 
import java.util.Date;
 
import modeles_generale.NiveauFormation;
import modeles_generale.TypeFormation;
 
/**
 * Formation generated by hbm2java
 */
public class Formation implements java.io.Serializable {
 
	/**
         * 
         */
	private static final long serialVersionUID = 1L;
	private Integer idFormation;
	private String titreFormation;
	private String dateDebut;
	private Date dateFin;
	private String descriptionFormation;
	private String etablissement;
	private String ville;
	private String paye;
	private Candidat candidat;
	private TypeFormation typeFormation;
	private NiveauFormation nvFormation;
 
	public Formation() {
	}
 
	public Formation(String titreFormation, String dateDebut, Date dateFin,
			String descriptionFormation, String etablissement, String ville,
			String paye, Candidat candidat, TypeFormation typeFormation,
			NiveauFormation nvFormation) {
		this.titreFormation = titreFormation;
		this.dateDebut = dateDebut;
		this.dateFin = dateFin;
		this.descriptionFormation = descriptionFormation;
		this.etablissement = etablissement;
		this.ville = ville;
		this.paye = paye;
		this.candidat = candidat;
		this.typeFormation = typeFormation;
		this.nvFormation = nvFormation;
	}
 
	public Integer getIdFormation() {
		return this.idFormation;
	}
 
	public void setIdFormation(Integer idFormation) {
		this.idFormation = idFormation;
	}
 
	public String getTitreFormation() {
		return this.titreFormation;
	}
 
	public void setTitreFormation(String titreFormation) {
		this.titreFormation = titreFormation;
	}
 
	public String getDateDebut() {
		return this.dateDebut;
	}
 
	public void setDateDebut(String dateDebut) {
		this.dateDebut = dateDebut;
	}
 
	public Date getDateFin() {
		return this.dateFin;
	}
 
	public void setDateFin(Date dateFin) {
		this.dateFin = dateFin;
	}
 
	public String getDescriptionFormation() {
		return this.descriptionFormation;
	}
 
	public void setDescriptionFormation(String descriptionFormation) {
		this.descriptionFormation = descriptionFormation;
	}
 
	public String getEtablissement() {
		return this.etablissement;
	}
 
	public void setEtablissement(String etablissement) {
		this.etablissement = etablissement;
	}
 
	public String getVille() {
		return this.ville;
	}
 
	public void setVille(String ville) {
		this.ville = ville;
	}
 
	public String getPaye() {
		return this.paye;
	}
 
	public void setPaye(String paye) {
		this.paye = paye;
	}
 
	public void setCandidat(Candidat candidat) {
		this.candidat = candidat;
	}
 
	public Candidat getCandidat() {
		return candidat;
	}
 
	public void setTypeFormation(TypeFormation typeFormation) {
		this.typeFormation = typeFormation;
	}
 
	public TypeFormation getTypeFormation() {
		return typeFormation;
	}
 
	public void setNvFormation(NiveauFormation nvFormation) {
		this.nvFormation = nvFormation;
	}
 
	public NiveauFormation getNvFormation() {
		return nvFormation;
	}
}

struts-config.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
                               "http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
 <data-sources/>
 <form-beans>
  <form-bean name="candidat" type="modeles_candidat.Candidat"/>
  <form-bean name="civilite" type="modeles_generale.Civilite"/>
  <form-bean name="cv" type="modeles_candidat.Cv"/>
 </form-beans>
 <global-exceptions/>
 <global-forwards/>
 <action-mappings>
  <action parameter="/inscription_candidat.jsp"
   path="/inscription_candidat" type="org.apache.struts.actions.ForwardAction"/>
  <action name="candidat" path="/creer_cv" scope="session" type="actions_candidat.Inscription_candidat">
   <forward name="succes" path="/creer_cv.jsp"/>
   <forward name="deny" path="/index.jsp"/>
  </action>
  <action name="cv" path="/creer_cv2" scope="request" type="actions_candidat.CV">
   <forward name="succes" path="/creer_cv2.jsp"/>
  </action>
 </action-mappings>
 <controller/>
</struts-config>

donc je veux savoir comment initialiser une propriété d'un objet dans une liste.
Merci d'avance