FWIW corresponding issues are: Can't run examples as a WAR with Jetty 6.1.1 http://issues.apache.org/jira/browse/WICKET-424
Page Expired in ajax clock example http://issues.apache.org/jira/browse/WICKET-423 Page Expired in stateless example http://issues.apache.org/jira/browse/WICKET-422 -- Jean-Baptiste Quenot aka John Banana Qwerty http://caraldi.com/jbq/
