The JSP implicit object ‘session’ is used to track user session between user requests.

Name Interface Tomcat Implementation
session javax.servlet.http.HttpSession org.apache.catalina.session.StandardSessionFacade

JSP implicit object ‘session’ example program (github)

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<!-- jsp implicit object request example -->
Tomcat implementation of jsp implicit object s :  <% out.println(session.getClass().getCanonicalName()); %> <br/>

<!-- how to add an attribute to session -->
<%session.setAttribute("who", ""); %>

<!-- how to get an attribute from session -->
<%out.println(session.getAttribute("who"));%>  <br/>

<!-- how to access servlet context using session object -->
<%session.getServletContext().setAttribute("attribute1", "attribute1Value"); %>

<%out.println(session.getServletContext().getAttribute("attribute1")); %>


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