What Is Jsessionid Inward J2ee Spider Web Application - Jsp Servlet?
What is JSESSIONID inwards JSP-Servlet
JSESSIONID is a cookie generated past times Servlet containers similar Tomcat or Jetty as well as used for session management inwards J2EE spider web application for HTTP protocol. Since HTTP is a stateless protocol at that spot is no agency for Web Server to relate ii divide requests coming from the same customer as well as Session management is the procedure to rails user session using unlike session management techniques similar Cookies as well as URL Rewriting. If a Web server is using a cookie for session management it creates as well as sends JSESSIONID cookie to the customer as well as and then the customer sends it dorsum to the server inwards subsequent HTTP requests. JSESSIONID as well as session management is a non entirely a pop Servlet interview question but also appear inwards diverse JSP interviews. Along amongst What is JSESSIONID interviewer are also interested inwards when as well as how JSESSIONID is created inwards Servlet as well as JSP which nosotros volition run across inwards side past times side section.
When JSESSIONID created inwards the Web application?
In Java J2EE application container is responsible for Session management as well as past times default uses Cookie. When a user starting fourth dimension time access your spider web application, session is created based on whether its accessing HTML, JSP or Servlet. if user asking is served past times Servlet than session is created past times calling request.getSession(true) method. it accepts a boolean parameter which learn to practice session if its non already existed.
If y'all telephone band request.getSession(false) as well as then it volition either provide null if no session is associated amongst this user or provide the associated HttpSession object. If HttpRequest is for JSP page than Container automatically creates a novel Session amongst JSESSIONID if this characteristic is non disabled explicitly past times using page directive %@ page session="false" %>.
Once Session is created Container sends JSESSIONID cookie into response to the client. In illustration of HTML access, no user session is created. If client has disabled cookie than Container uses URL rewriting for managing session on which jsessionid is appended into URL every bit shown below:
If y'all telephone band request.getSession(false) as well as then it volition either provide null if no session is associated amongst this user or provide the associated HttpSession object. If HttpRequest is for JSP page than Container automatically creates a novel Session amongst JSESSIONID if this characteristic is non disabled explicitly past times using page directive %@ page session="false" %>.
Once Session is created Container sends JSESSIONID cookie into response to the client. In illustration of HTML access, no user session is created. If client has disabled cookie than Container uses URL rewriting for managing session on which jsessionid is appended into URL every bit shown below:
https://localhost:8443/supermart/login.htm;jsessionid=1A530637289A03B07199A44E8D531427
When HTTP session is invalidated(), to a greater extent than ofttimes than non when the user logged off, one-time JSESSIONID destroyed as well as a novel JSESSIONID is created when the user farther login.
How to monitor HTTP asking to cheque JSESSIONID
You tin terminate cheque the value of JSESSIONID coming inwards every bit cookie past times monitoring HTTP request. If y'all are running Tomcat Server inwards NetBeans IDE inwards your evolution surroundings as well as then y'all tin terminate role HTTP Server Monitor to cheque HTTP requests. You simply yell for to enable it spell starting Tomcat Server shape Netbeans. After than amongst each asking y'all tin terminate run across all details of asking headers, session, cookies etc inwards HTTP Server monitor screen. If y'all await on JSESSIONID cookie it volition await like:
cookie JSESSIONID=1A530637289A03B07199A44E8D531427
You tin terminate also enable HTTP asking as well as response inwards Client side past times using tools similar ethereal or Wireshark. This tool tin terminate monitor all HTTP traffic from as well as to your machine as well as past times looking at asking information y'all tin terminate run across JSESSIONID cookie as well as its value. That's all on What is JSESSIONID as well as How JSESSIONID is created within the J2EE application. We cause got seen that both Servlet as well as JSP tin terminate endure responsible for Session creation but its done past times Container. y'all tin terminate recall the value of SessionID which is represented past times JSESSIONID cookie when y'all telephone band request.getSession(). Session management inwards spider web applications is complex theme peculiarly when it comes to clustering as well as distributed session. On the other hand, JSESSIONID is 1 of those basics which every bit J2EE spider web application developer y'all should endure aware of.
Further Learning
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