[Richfaces]affichage des items de pickList

Bonjour tous le monde,
J’espère que vous pouvez m'aider, je travaille avec richfaces 3.3.3 et JSF 2 et j'ai une probléme avec pickList
voici mon code bean

Code:

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private SelectItem[] listnomDossier;
	List<Dossier> listDossier;
	public SelectItem[] getListnomDossier() {
		DossierHome dao = new DossierHome() ;
		Session session=HibernateUtil.getSessionFactory().getCurrentSession(); 
		session.beginTransaction();
		listDossier=dao.findAll();
		session.getTransaction().commit();
		listnomDossier=new SelectItem[listDossier.size()];
		for(int i=0;i<listDossier.size();i++){
			listnomDossier[i]=new SelectItem(listDossier.get(i).getNomdos());
		}
		return listnomDossier;
	}

et le fichier xhtml

Code:

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<rich:pickList   value="#{droitBean.droitLSelected}">
             <f:selectItem itemValue="Bentley" itemLabel="Bentley"/>
 
        <f:selectItem itemValue="Audi" itemLabel="Audi"/>
          <f:selectItems  value="#{droitBean.listnomDossier}" />  
        </rich:pickList>

j'ai l'exception suivante

Code:

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SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/RichDocumentJSF] threw exception [null] with root cause
java.lang.NullPointerException
	at org.richfaces.json.XML.escape(XML.java:78)
	at org.richfaces.renderkit.PickListRenderer.encodeItem(PickListRenderer.java:281)
	at org.richfaces.renderkit.PickListRenderer.encodeRows(PickListRenderer.java:235)
	at org.richfaces.renderkit.PickListRenderer.encodeSourceRows(PickListRenderer.java:312)
	at org.richfaces.renderkit.html.PickListRendererGen.doEncodeChildren(PickListRendererGen.java:351)
	at org.richfaces.renderkit.html.PickListRendererGen.doEncodeChildren(PickListRendererGen.java:264)
	at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:271)
	at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:242)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
	at javax.faces.render.Renderer.encodeChildren(Renderer.java:137)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809)
	at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:277)
	at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
	at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:200)
	at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:195)
	at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809)
	at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:277)
	at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
	at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:200)
	at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:195)
	at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:809)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
	at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
	at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
	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: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:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)