I have simple page
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html 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:p="http://primefaces.org/ui">
<h:head>
<link rel="stylesheet" type="text/css" href="css/styles.css" />
</h:head>
<h:body id="background" bgcolor="#F9F9F9">
<h:form>
<p:growl id="messages" showDetail="true"/>
<p:fileUpload fileUploadListener="#{fileUpload.handleFileUpload}" mode="advanced" dragDropSupport="false"
update="messages" sizeLimit="100000" fileLimit="3" allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />
</h:form>
</h:body>
</html>
the <p:growl id="messages" showDetail="true"/>
is not visible when any file uploaded, i am using like http://www.primefaces.org/showcase/ui/fileUploadSingle.jsf
consol shows an exception
com.ibm.ws.webcontainer.srt.SRTServletResponse setIntHeader SRVE8094W: WARNING: Cannot set header. Response already committed.
thanks