salut

j'ai un bouton et je veux lancer à partir de ce dernier etat de sorti mais je veux que l'état s'affiche sur le composant par sur la page completement juste une partie de la page

mais je n'arrive pas à faire ce traitement
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  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"    xmlns:h="http://java.sun.com/jsf/html"    xmlns:f="http://java.sun.com/jsf/core"    xmlns:ui="http://java.sun.com/jsf/facelets"    xmlns:a4j="http://richfaces.org/a4j"    xmlns:rich="http://richfaces.org/rich"> 
 <h:form> 
  <a4j:commandButton value="salut" render="out" execute="@form" />       
	       </h:form> 
	             <br /> 
 
<a4j:outputPanel id="out"> 
  <h:outputText value="#{imprimer .impri}"    />   
 </a4j:outputPanel>       
 
 
</ui:composition>


messsage d'erreur
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javax.el.PropertyNotFoundException: /imprimer.xhtml @14,49 value="#{imprimer .impri}": Property 'impri' not found on type imprimer
 
 
javax.faces.FacesException: javax.el.PropertyNotFoundException: /imprimer.xhtml @14,49 value="#{imprimer .impri}": Property 'impri' not found on type imprimer
	at javax.faces.component.UIOutput.getValue(UIOutput.java:187)
	at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:201)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:284)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:154)
	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
	at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:281)
	at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
	at org.ajax4jsf.renderkit.html.AjaxOutputPanelRenderer.encodeChildren(AjaxOutputPanelRenderer.java:78)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:594)
	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:110)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
	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:240)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: javax.el.PropertyNotFoundException: /imprimer.xhtml @14,49 value="#{imprimer .impri}": Property 'impri' not found on type imprimer
	at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:73)
	at javax.faces.component.UIOutput.getValue(UIOutput.java:184)
	... 39 more