WebApp et Hibernate

Salut,
voilà, je developpe avec hibernate une application web.
L'erreur est survenue lorsque j'ai essayé de faire l'authentification et la redirection vers la page d'accueil: ainsi je récupère l'utilisateur signed on dans un objet et je l'envois à la page d'acceuil, ça a bien marché au début mais l'erreur est survenue soudain!! alors que j'ai rien touché au code de Login!!!!
Pour etre claire , voila avec qoi ma servlet se termine:

Code:

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try {   UserBean user = new UserBean(); user.setUsername(request.getParameter("username")); user.setPassword(request.getParameter("password"));   user = UserDaoLogin.login(user);     if(user.isValid()) { HttpSession session = request.getSession(true);   session.setAttribute("currentSessionUser",user);   response.sendRedirect("content.jsp");//accueil } //     else   else { HttpSession session = request.getSession(true);   response.sendRedirect("InvalidLogin.jsp"); }     }     catch (Throwable theException) { System.out.println(theException); }

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et après dans la page d'accueil:
.......

Code:

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<div class="title4" > <% UserBean currentUser = (UserBean) (session.getAttribute("currentSessionUser"));%> Bienvenue <%= currentUser.getUsername() %> </div>

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Mais voula quand j'entre le login et le mot de passe: une exeption s'affiche,et la servlet affiche une page blanche!! mm si le login est incorrect, je dois avoir la page invalid login.jsp, mais ce n'est plus le cas.
Voila l'exception:
INFO: Le rechargement de ce contexte est terminé
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
java.lang.ExceptionInInitializerError

Pour les warnings ce sont pas nouveaux pour l'instant!!
SVP si qq'un pourrait m'aider???

Bon, aprés avoir ajouter le fichier lod4j.properties à src, voilà ce que j'ai en console, le meme poroblème persiste

Code:

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28 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Environment - Hibernate 3.3.2.GA 33 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Environment - hibernate.properties not found 40 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Environment - Bytecode provider name : javassist 47 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling 188 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Configuration - configuring from resource: /hibernate.cfg.xml 188 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Configuration - Configuration resource: /hibernate.cfg.xml 503 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : hibernate.hbm.xml 648 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.User -> user 672 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Courtier -> courtier 849 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Agent -> agent 849 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Assure -> assure 849 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Contratass -> contratass 850 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.GarSet -> gar 851 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Auto -> auto 852 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Habitat -> habitat 852 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Vie -> vie 852 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Agricole -> agricole 853 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Cheque -> cheque 853 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Compagniet -> compagniet 853 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Expert -> expert 854 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Garagiste -> garagiste 854 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Payement -> payement 854 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Sinistre -> sinistre 855 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Traite -> traite 855 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Fcaisse -> fcaisse 856 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Quittance -> quittance 857 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Garantie -> garantie 857 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Garantie.ContratassSet -> gar 857 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Gar -> gar 857 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping class: modele.Recu2 -> recu2 858 [http-apr-8080-exec-9] INFO org.hibernate.cfg.Configuration - Configured SessionFactory: null 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.User.AgentSet -> agent 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.User.FcaisseSet -> fcaisse 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.User.CourtierSet -> courtier 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Assure.ContratassSet -> contratass 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.AgricoleSet -> agricole 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.FcaisseSet -> fcaisse 859 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.VieSet -> vie 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.SinistreSet -> sinistre 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.HabitatSet -> habitat 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.Recu2Set -> recu2 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Contratass.AutoSet -> auto 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Compagniet.SinistreSet -> sinistre 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Expert.SinistreSet -> sinistre 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Garagiste.SinistreSet -> sinistre 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Payement.TraiteSet -> traite 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Payement.ChequeSet -> cheque 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Fcaisse.QuittanceSet -> quittance 860 [http-apr-8080-exec-9] INFO org.hibernate.cfg.HbmBinder - Mapping collection: modele.Quittance.PayementSet -> payement java.lang.ExceptionInInitializerError

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qqu'un m'aide svp?