Can i remove the items in session once timeout

note: i did not mean the session.timeout issue, I mean that I want to remove some of the item which set in the session, once timeout, but the session still.

You could probably use a java.util.Timer with a java.util.TimerTask to do this sort of thing. Here is the API: http://java.sun.com/j2se/1.4.2/docs/api/ That should help you find out how to use the two classes.
I would guess what you could do is create a Timer in the ServletContext. Then, everytime a user adds something to the session, you would create a TimerTask with access to the session and the item name. When the task is due, remove the item from the session and kill the task. You would also want to provide a means of stopping or reseting the TimerTask I would guess, but the details are up to you.

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Can i remove the items in session once timeout

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