How to avoid one active session for the same user account concurrently

Question

Hi all ,
i am using model 1 architecture in my application.
in my application ,if one user login through 2 browser at a time ,he can do it.
But now ,i want to close first browser or redirect him to a exception page.
plz guide me how can i do it.
plz include case1.
what happen if he close page ,not logoff
case2
what happen if power cut happen on client side.

Answer 1

+You can use a column in the table to check the current user logged in status. Once the user gets logged in the application change the flag at the backend. In this way you can know whether the user is already logged in the apllication or not, and based on this you can show a proper message to the user.+
+If the user closes the browser window without logging off the application, then in this case you can use the session Listoners.+
Well not the right approach Listeners would it for you.For browser closure problem.If user does that automatically container destroys the session object as per configured session-timeout.
*@OP*
Problem 1:
Try to a write an implementation of sessionListener / sessionAttributeListener (for having a check on user loggins and apply a global filter which checks available users who have already logged in)
Hope the below thread might give you some idea of how to go about.
http://forum.java.sun.com/thread.jspa?threadID=5226527&messageID=9922478
Problem 2:
consequently configure session-timeout parameter in minutes under web.xml for session browser close and inactivity state problems.
REGARDS,
RaHuL