<rich:panel  id="logpan"   style="background-image:url(#{facesContext.externalContext.requestContextPath}/images/Authentif.png);background-repeat:no-repeat;background-position:-35px-15px;"header="Authentification" styleClass="panel_3">
               
                    <h:outputText value="login:"/>
                    <h:inputText   id="log"  value="#{AuthentificationBean.login}"  required="true" requiredMessage="champs obligatoire"/>
                    <rich:message for="log" style="color: red"/>
                    <h:outputText value="Password:"/>
                    <h:inputSecret id="mdp"  value="#{AuthentificationBean.password}"  required="true" requiredMessage="champs obligatoire"/>
                    <rich:message for="mdp" style="color: red"/>  
                 <rich:spacer height="20px"></rich:spacer>
 
                 <a4j:commandButton  value="connexion" action="#{AuthentificationBean.connecter}"  >
                     
                 </a4j:commandButton>

Hibernate: select utilisateu0_.id_user as id1_9_, utilisateu0_.login as login9_, utilisateu0_.pwd as pwd9_, utilisateu0_.nom as nom9_, utilisateu0_.prenom as prenom9_, utilisateu0_.adresse as adresse9_, utilisateu0_.date_naissance as date7_9_, utilisateu0_.tel as tel9_, utilisateu0_.mail as mail9_, utilisateu0_.droit as droit9_ from bd_pfe.utilisateur utilisateu0_ where utilisateu0_.login='null' and utilisateu0_.pwd='null'
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.RangeCheck(ArrayList.java:547)
        at java.util.ArrayList.get(ArrayList.java:322)
        at implementation.dao.AuthentificationDaoImpl.findByLoginAndPassword(AuthentificationDaoImpl.java:23)
        at implementation.service.AuthentificationServiceImpl.findByLoginAndPassword(AuthentificationServiceImpl.java:21)
        at Beans.AuthentificationBean.connecter(AuthentificationBean.java:68)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.el.parser.AstValue.invoke(AstValue.java:172)
        at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
        at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:68)
        at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:77)
        at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:91)
        at javax.faces.component.UICommand.broadcast(UICommand.java:383)
        at org.ajax4jsf.component.AjaxActionComponent.broadcast(AjaxActionComponent.java:55)
        at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:324)
        at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:299)
        at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:256)
        at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:469)
        at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:97)
        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
        at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
        at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
        at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
        at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)