The J2EE spec requires different sessions for different WAR files , even if the sesison id is the same. That's why you see what you see. However: JBossPortal has a configuration option where all portlet WARs can be configured to use the Portal's session (I don't remember where it is though ;) . In other words: you can configure the portal to use only one session across all WAR files. This was done to allow for clustered session support. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982390#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...