Darn it - I'd confused myself with the fact that the web service code was part of the Seam app and didn't appreciate that the WS servlet was elsewhere. I guess that scuppers my plans until HttpSession sharing between WAR modules is implemented (which has just received my vote): http://jira.jboss.com/jira/browse/JBAS-2861 To clarify what I meant by using an "existing session": I was using a Java applet embedded within a Seam application which I wanted to interact with same session by passing in the web page's JSESSIONID to the applet by parameter. Cheers, Chris. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4069519#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...