HttpSessionListener using Deployment Descriptor

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

public class SessionListenerEx implements HttpSessionListener {

    @Override
    public void sessionCreated(HttpSessionEvent se) {
        System.out.println("Session Created");
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent se) {
        System.out.println("Session Destroyed");
     }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <listener>
        <description>HttpSessionListener</description>
        <listener-class>SessionListenerEx</listener-class>
    </listener>
</web-app>

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;

@WebServlet(urlPatterns = {"/SampleApp"})
public class SampleApp extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse res)throws IOException{
        System.out.println("About to create session");
        HttpSession mySession = req.getSession();
        try(PrintWriter out = res.getWriter()){
            out.println(mySession.getId());
        }
        
        System.out.println("About to invalidate session");
        mySession.invalidate();
    }
}

Run 'SampleApp', you can observe the below messages in server console.

Info:   About to create session
Info:   Session Created
Info:   About to invalidate session
Info:   Session Destroyed

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