Answer Posted / sunil

HttpSessionListener is Listener whenever session is created.

import javax.servlet.http.HttpSessionListener;
import javax.servlet.http.HttpSessionEvent;

public class SessionCounter implements HttpSessionListener {

private static int activeSessions = 0;

public void sessionCreated(HttpSessionEvent se) {
activeSessions++;
}

public void sessionDestroyed(HttpSessionEvent se) {
if(activeSessions > 0)
activeSessions--;
}

public static int getActiveSessions() {
return activeSessions;
}
}

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