asked on

Session expired

Hi,

When a session expires,
I want to display an alert message "Session Expired" (or maybe you have a better idea ?)
And then forward the user to the main page.

The problem is that in my code I don't know how I can check if a session expired.
For example he stays on the same page during mre than 30 minutes, then he clicks on a button calling some action, there will be errors because I am trying to read information in the session.

Thank you for any help.

Bart Cremers

You can add some JavaScript to all your pages:

function alertSessionTimeout() {
var delayInSeconds = <%=session.getMaxInactiveInterval() %>;
var delay = delayInSeconds * 1000;
self.setTimeout('showSessionAlert()', delay);
}

function showSessionAlert() {
var msg = 'Session Expired'
alert(msg);
self.location = '/';
}

matthew016

ASKER

The problem is in the code,
it will have exceptions at runtime.

SOLUTION

Bart Cremers

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mnrz

You can also use a listener HttpSessionListener
it has two methods

sessionCreated(HttpSessionEvent e)
and
sessionDestroyed(HttpSessionEvent e)

so just before a session is going to destroy you can set an attribute in servlet context

SOLUTION

mnrz

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ASKER CERTIFIED SOLUTION

jamoville

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matthew016

ASKER

The only good suggestion is the filter,
but I assist others for the effort of course