What is JSESSIONID in J2EE Web application - JSP Servlet?

What is JSESSIONID in JSP-Servlet
JSESSIONID is a cookie generated by Servlet containers like Tomcat or Jetty and used for session management in J2EE web application for HTTP protocol. Since HTTP is a stateless protocol there is no way for Web Server to relate two separate requests coming from the same client and Session management is the process to track user session using different session management techniques like Cookies and URL Rewriting. If a Web server is using a cookie for session management it creates and sends JSESSIONID cookie to the client and then the client sends it back to the server in subsequent HTTP requests. JSESSIONID and session management is a not only a popular Servlet interview question but also appear in various JSP interviews. Along with What is JSESSIONID interviewer are also interested in when and how JSESSIONID is created in Servlet and JSP which we will see in next section.
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