the number of online users needs to be counted in the project, and the sessionCreated that uses HttpSessionListener,LoginController to call request.getSession (), HttpSessionListener event listeners is not executed.

related codes

@WebListener
public class SessionListener  implements HttpSessionListener, HttpSessionAttributeListener {

    public static final Logger logger = LoggerFactory.getLogger(SessionListener.class);

    /**
     * session
     */
    public int count = 0;

    public SessionListener(){

        logger.info("SessionListener......");
    }

    @Override
    public void sessionCreated(HttpSessionEvent httpSessionEvent) {
        logger.info("===============sessionCreated===============");
        System.out.println("HttpSessionListenercountPP  ");
        countPP;
        httpSessionEvent.getSession().getServletContext().setAttribute("count", count);
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
        logger.info("===============sessionDestroyed===============");
        System.out.println("HttpSessionListenercount--  ");
        count--;
        httpSessionEvent.getSession().getServletContext().setAttribute("count", count);

    }

    @Override
    public void attributeAdded(HttpSessionBindingEvent httpSessionBindingEvent) {
        System.out.println("1111111111111111111111111111");
    }

    @Override
    public void attributeRemoved(HttpSessionBindingEvent httpSessionBindingEvent) {
        System.out.println("222222222222222222222222222222");
    }

    @Override
    public void attributeReplaced(HttpSessionBindingEvent httpSessionBindingEvent) {
        System.out.println("333333333333333333333333333333333");
    }

when the project starts, the printed SessionListener., indicates that the listener class has been initialized and the listener has been called.