奇怪的session混乱问题


服务器:jboss4.2
问题:偶尔两个帐号在两台不同的机器上,a帐户获取了b帐号的session值
public ActionForward loadDialogList4Inbox(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)throws Exception{
MailService service = (MailService)this.getBean("mailService");
List labels = (List)request.getSession().getAttribute("labels");
if(labels == null){
labels = service.loadLabelWithTotal(this.getUserId());
request.getSession().setAttribute("labels",labels);
}
return mapping.findForward("dialogList");
}