'session' is undefined - javascript error in my JSF/JSP page

Question

I have the following JSF/JSP page. In onLoad() I invoke a javascript function func(). In this method, I attempt to lookup an attribute from the Http Session. When I run my application, my page is loaded with but the icon on the lower left corner of the browser indicated that there was an error. When I viewed the error, it read : 'session' is undefined.
The 'session' variable is available in a JSP page.
So why does my code not work from within a JSF application.
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="1.2" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:jsp="http://java.sun.com/JSP/Page"
xmlns:ui="http://www.sun.com/web/ui">
    <jsp:directive.page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"/>   
    <f:view>
        <ui:page binding="#{bean.page1}" id="page1">
            <ui:html binding="#{bean.html1}" id="html1">
                <ui:head binding="#{bean.head1}" id="head1">
                    </ui:head>
                <ui:body binding="#{bean.body1}" onLoad="func()" id="body1" style="-rave-layout: grid">
                    <ui:form binding="#{bean.form1}" id="form1">                       
                        <h:inputText binding="#{bean.inputText}" id="inputText"/>
                    </ui:form>
                </ui:body>
            </ui:html>
        </ui:page>
    </f:view>
    <script type="text/javascript">
        function func(){                  
                alert("in func()");
                var y = session.getAttribute("test");
                alert(y);
    </script>
</jsp:root>thanks,
tsc

Answer 1

Because :
Session.getAtrribute is java-code that can only run on the server
and
var y = session.getAttribute is javascript-code run on the client.