Answer is no. I modified ContentTypeInterceptor to spit out values in HttpSession since over there I have access to it and this is what I get: Object org.jboss.portal.session.contexts value is [/failover-portlet] Object jboss.portlet.session.FailoverTestPortletInstance value is org.jboss.portal.portlet.session.SubSession@1127dc0 Object portal.principalview_id value is 0 Object portal.principal/default/FailoverTestPortletPage/FailoverTestPageWindow value is org.jboss.portal.core.model.portal.navstate.WindowNavigationalState@17a1ad3 So, total session size will be sum of sizes of all these. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172409#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...