Bonjour

J'ai mon bean utilisateurBean qui implémente la Class Serializable, mais lorsque je lance l'application, tout marche bien mais j'ai le message d'erreur suivant:

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sept. 27, 2015 8:05:00 PM org.apache.catalina.session.StandardSession writeObject
AVERTISSEMENT: Impossible de sérialiser l'attribut de session utilisateurBean pour la session F155442CE7F6BF8458A004C999311376
java.io.NotSerializableException: com.telnet.entretien.dao.impl.LoginImpl
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
	at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1671)
	at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:1077)
	at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:432)
	at org.apache.catalina.session.StandardManager.unload(StandardManager.java:353)
	at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:518)
	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
	at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5569)
	at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
	at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3919)
	at org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:954)
	at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:364)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
	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:581)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	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:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

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public class LoginImpl implements ILogin, java.io.Serializable {
 
    @Override
    public Login charger(Login l) {
        Login lg = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            Query query = session.createQuery("From Login l where l.usernamse = '" + l.getUsernamse() + "' and l.motpasse='" + l.getMotpasse() + "'");
            if (!query.list().isEmpty()) {
                lg = (Login) query.uniqueResult();
            }
        } catch (HibernateException e) {
            lg = null;
        }
        return lg;
    }
 
    @Override
    public Login getLogin(int idC) {
        Login login = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            login = (Login) session.get(Login.class, idC);
        } catch (HibernateException e) {
            login = null;
        }
        session.close();
        return login;
    }
 
}
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@ManagedBean
@SessionScoped
public class UtilisateurBean implements java.io.Serializable{
 
    private Login login;
    private String role;
    private Login util = new Login();
    private LoginImpl dao;
    Login l;
 
    @PostConstruct
    public void init() {
        dao = new LoginImpl();
    }
 
    public Login getEventBC(int id) {
        ILogin dao1 = new LoginImpl();
        login = dao1.getLogin(id);
        return login;
    }
 
    public String doLogin() {
        String rslt = null;
        l = dao.charger(this.util);
        if (l != null) {
            if (l instanceof Administrateur) {
                role = "administrateur";
                rslt = "administrateur/rapport?faces-redirect=true";
            } else if (l instanceof Responsable) {
                role = "responsable";
                rslt = "/view/responsable/rapport?faces-redirect=true";
            }
        } else {
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR,
                    "Verifier votre login ou mot passe", "Verifier votre login ou mot passe"));
        }
        return rslt;
    }
 
    public String doLayout() {
        FacesContext.getCurrentInstance().getExternalContext().getSessionMap().clear();
        return "/view/index?faces-redirect=true";
    }
D'où peut venir l'erreur?

Merci