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How can my application get to know when a HttpSession is removed (when it time-outs)?

April 26, 2017application httpsession removed time-outs

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How can my application get to know when a HttpSession is removed (when it time-outs)?

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Define a class, say SessionTimeoutNotifier, that implements javax.servlet.http.HttpSessionBindingListener. Create a SessionTimeoutNotifier object and add it to the user session. When the session is removed, SessionTimeoutNotifier.valueUnbound() will be called by the servlet engine. You can implement valueUnbound() to do whatever you want.