Warn the user before session timeout

Question

I have a web application implemented in Spring MVC, JSP.
Default session timeout is defined in web.xml is 30 min.

if use

Answer 1

Do you know windows.setTimeout

http://www.w3schools.com/jsref/met_win_settimeout.asp

This is what you need

For example

var resetTime_int;
function resetTimer(){
    if(resetTime_int) window.clearTimeout(resetTime_int)
    resetTime_int=window.setTimeout(function (){
    if(prompt('Your session is going to be end by 5 min, Please click OK to continue'))     
    location.reload()
    }, 1000*60*25)
}

resetTimer()
document.onmousemove=resetTimer
document.onkeyup=resetTimer

1000*60*25 = 25 Minutes.