It is not problem with clustering, I found http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossASTuningSliming and i remove cluster configuration according to instructions. But I have still this problem. Session is null. Pool in the class is: private transient HttpServletRequest request; this is from my log file. request=org.apache.catalina.connector.RequestFacade@1854be request.getSession()=null When debugging is on, Session is not null, but when I turn debug off request.getSession() returns null. Any suggestions? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3967216#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...