How to delete the data stored in session?

Question

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Delete.jsp

HTML

<body>
<form >
<% User u = (User)session.getAttribute("modifiedUserInfo"); 
out.println(u);
session.removeAttribute("u");
if (u != null)
    out.print(u);
%>
</form>
</body>

User is a pojo class.

ModifyUser.java(Servlet class)

Java

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
			
    User user = new User();
    HttpSession session = request.getSession(true);
		
    user.setFirstName(request.getParameter("FirstName"));
    user.setLastName(request.getParameter("LastName"));
    user.setUserId(request.getParameter("UserId"));
				
    session.setAttribute("modifiedUserInfo",user);
    response.sendRedirect("EditedDetails.jsp");
}

Im not able to delete the data stored in session and getting error as "An exception occurred processing JSP page". What changes has to be done in the code?

Posted 6-Jun-13 2:28am

Shruthi GM

Updated 6-Jun-13 3:39am

Prasad Khandekar

v2

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Prasad Khandekar · Answer 1 · 2013-06-06T03:40:00

Hello Shruthi,

Change your jsp code as shown below.

HTML

<%@ page contentType="text/html;charset=utf-8" language="java" %>
<%@ page import="com.foo.User"%>
<html>
<head></head>
<body>
<form>
<% User u = (User) session.getAttribute("modifiedUserInfo"); 
session.removeAttribute("modifiedUserInfo");
if (u != null)
    out.print(u.getFirstName() + u.getLastName());
%>
</form>
</body>
</html>

Please change import declaration to match the package of User class in above sample(Second line).

You were probably getting error because of this missing import. Also you were removing wrong (probably non-existing) session attribute, you should have removed session attribute named modifiedUserInfo and not u.

Regards,