I know that to change default (30 minutes?) HttpSession expiration time out we put
into web.xml. So with this setting, the user's session will be automatically deactivated after x minutes of inactivity.
My question is: how Tomcat determines this "inactivity"? Does that mean time which user didn't access HttpSession object? or what exactly? Or this user didn't access any server's (okay, application's) page at all, even if page does not use HttpSession?