When the same Servlet is called from jsp2 or even if the page is refreshed, the session variable is null this time.I put few lines to check if session is valid-and it prints the second time. I want to know how to set cookieless session variables in jsp, because when I run my application multiple times, multiple tabs get open and the session variable is shared among them(because these s.if(!(session.getAttribute("user")null)) . How to check the session is null or not. Thanks.Visual Studio .NET - Session Variable is null after retrieving www.nullskull.com. The following code examples show how to determine if a variable or object is null.Checking if a variable is null in Java is very easy. I ve checked the session id. It is same for both requests. I am just learning jsp. Kindly help me out with this.install ionic 2 error : npm ERROR cannot read property path of null with windows 10 2239 visits. Sesssion Variable Returns Null. By Guest shiningstar, February 6, 2009 in Java/JSP/J2EE.I have tried the above codes. Session variable is returning null in the second page. Can anyone tell me where is the problem? JSP Session Overview. JSP is the Server side programming language.
The session variable is fixed if there is no incoming session reference.< session.setAttribute("userid", null) session.invalidate() response.sendRedirect("index. jsp")Check if this is new visitor on our web page. if (session.isNew()).