Cannot get Session Object in JSP

In my global.jsp file on line 44 I have

I want to try use session such as

session.setAttribute(userIDKey, userID);

on a jsp page.

in global.jsp I  have

--%><%@page session="false" import="javax.jcr.*,

If I change it to

--%><%@page session="true" import="javax.jcr.*,

then every page I try display give

/libs/foundation/global.jsp(44,4) Page directive: illegal to have multiple occurrences of session with different values (old: false, new: true)

else

If I leave global.jsp with

--%><%@page session="false" import="javax.jcr.*,

And I try enable session on my jsp page

<%@page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@include file="/libs/foundation/global.jsp"%>
<%@page session="true"%>

I get

org.apache.sling.api.scripting.ScriptEvaluationException: org.apache.sling.scripting.jsp.jasper.JasperException: /apps/components/comps/compponentexample/compponentexample.jsp(3,0) Page directive: illegal to have multiple occurrences of session with different values (old: false, new: true)

Is there a way to be able to use session object in aem 6.1