Erro com rich editor

Tenho uma aplicação que irá usar o rich editor
o diretório ta dentro do webcontet

código do rich editor
<a4j:form id=“formcadastroarquivo”>
<h:panelGrid columns=“1”>
<rich:fileUpload fileUploadListener="#{managedarquivo.upload}"
id=“upload” maxFilesQuantity=“20” acceptedTypes="PDF,JPG,"
addControlLabel="Selecionar arquivo…"
clearAllControlLabel=“Limpar Todos” clearControlLabel="Limpar"
cleanButtonClassDisabled=“false” cancelEntryControlLabel="Cancelar"
progressLabel=“Carregando…” stopControlLabel="Parar"
uploadControlLabel=“Importar” doneLabel=“Importação Finalizada!“
listHeight=“50px” autoclear=“false” immediateUpload=“false” >
<f:facet name=“label”>
<h:outputText value=”{_KB}KB from {KB}KB uploaded — {mm}:{ss}” />
</f:facet>
</rich:fileUpload>

		</h:panelGrid>
	</a4j:form>

Método de Upload

public void upload(UploadEvent event) throws FileNotFoundException,
Exception {
UploadItem upload = event.getUploadItem();
if (upload.isTempFile()) {
String string[] = upload.getFileName().split("////");
File arquivoUpload = new File("//arquivos//download//" + string[string.length -1]);

        InputStream in = new FileInputStream(upload.getFile());  
        OutputStream out = new FileOutputStream(arquivoUpload);  
        byte[] buf = new byte[1024];  
        int len;  
        while ((len = in.read(buf)) > 0) {  
            out.write(buf, 0, len);  
        }  
        in.close();  
        out.close();  
         
    } else {  
        ByteArrayOutputStream b = new ByteArrayOutputStream();  
        b.write(event.getUploadItem().getData());  
    }  
}

mensagem de erro :

27/08/2010 11:18:34 com.sun.faces.lifecycle.ApplyRequestValuesPhase execute
AVISO: org.apache.jasper.el.JspELException: /sistema/arquivo.jsp(96,4) ‘#{managedarquivo.upload}’ java.io.FileNotFoundException: \arquivos\download\papelcarta_A4_word.jpg (Acesso negado)
javax.faces.el.EvaluationException: org.apache.jasper.el.JspELException: /sistema/arquivo.jsp(96,4) ‘#{managedarquivo.upload}’ java.io.FileNotFoundException: \arquivos\download\papelcarta_A4_word.jpg (Acesso negado)
at org.richfaces.webapp.taglib.MethodBindingMethodExpressionAdaptor.invoke(MethodBindingMethodExpressionAdaptor.java:73)
at org.richfaces.component.UIFileUpload.broadcast(UIFileUpload.java:189)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:321)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:294)
at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:253)
at org.ajax4jsf.component.AjaxViewRoot.processDecodes(AjaxViewRoot.java:409)
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:532)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:365)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.jasper.el.JspELException: /sistema/arquivo.jsp(96,4) ‘#{managedarquivo.upload}’ java.io.FileNotFoundException: \arquivos\download\papelcarta_A4_word.jpg (Acesso negado)
at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:77)
at org.richfaces.webapp.taglib.MethodBindingMethodExpressionAdaptor.invoke(MethodBindingMethodExpressionAdaptor.java:69)
… 30 more
Caused by: java.io.FileNotFoundException: \arquivos\download\papelcarta_A4_word.jpg (Acesso negado)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.(Unknown Source)
at java.io.FileOutputStream.(Unknown Source)
at br.com.sac.control.ManagedArquivo.upload(ManagedArquivo.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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)
… 31 more
27/08/2010 11:18:34 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet Faces Servlet threw exception
java.io.FileNotFoundException: \arquivos\download\papelcarta_A4_word.jpg (Acesso negado)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.(Unknown Source)
at java.io.FileOutputStream.(Unknown Source)
at br.com.sac.control.ManagedArquivo.upload(ManagedArquivo.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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 org.richfaces.webapp.taglib.MethodBindingMethodExpressionAdaptor.invoke(MethodBindingMethodExpressionAdaptor.java:69)
at org.richfaces.component.UIFileUpload.broadcast(UIFileUpload.java:189)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:321)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:294)
at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:253)
at org.ajax4jsf.component.AjaxViewRoot.processDecodes(AjaxViewRoot.java:409)
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:532)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:365)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)