Getting currently Logged in members

I want to know how many members are currently logged into the given system .
Or in other words i would like to know how many sessions are presently running into my server . how is this possible .
I am trying to do like this .
HttpSession session = req.getSession();
HttpSessionContext context = session.getSessionContext();
Enumeration en = context.getIds();
while(en.hasMoreElements())
String s = (String)en.nextElement();
     out.println(s);
But i dont get any output .
Please somebody guide me .

hi
u can add a field in ur master table like status and update the field to 1 whenever the user logs in and to 0 if the user logs out or if the session expires
hope this helps u
cheers
suri

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