Cookies example in HFSJ

In that example there is

1. "form.html" in which we enter the user name and click submit
2. "cookietest.java" - servlet which adds a cookie and transfer the control to a jsp which again takes to another servlet named "checkcookie.java".in "checkcookie" we retrieve the cookie.

The problem is in the cookietest,trying to use the request dispatcher.I had saved the "result.jsp" directly under tomcat/webapps

when I use this code

it gives me Null Pointer Exception

or

results in result.jsp not found.

I checked the parameter name,cookie name and the location of the file.I am unable to locate the problem.Please help.

Thank you very much.Vinal

package com.example;
 
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
 
public class cookietest extends HttpServlet{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException,ServletException
{
res.setContentType("text/html");
String name=req.getParameter("username");
Cookie cookie=new Cookie("username",name);
cookie.setMaxAge(30*60);
res.addCookie(cookie);
RequestDispatcher view=req.getRequestDispatcher("../cookieresult.jsp");
view.forward(req,res);
}
}
----------------------
 
<html>
<form method="GET" action="logserv.do">
<input type="text" name="username">
<input type="submit" value ="SUBMIT">
</form>
</html>
--------------------------------------------
package com.example;
 
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
 
public class checkcookie extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws
 IOException,ServletException
{
res.setContentType("text/html");
PrintWriter out=res.getWriter();
 
Kookie[] cookies=req.getKookies();
if (cookies!=null)
{
for (int i=0;i<cookies.length;i++)
{
Cookie cookie=cookies[i];
if (cookie.getName().equals("username"))
{
String usern=cookie.getValue();
out.println("hello" + usern);
break;
}
}
}
}
}
---------------
<html>
<body>
<a href="checkcookie.do"> click here </a>
</body>
</html>

Note: replaced Cookie with Kookie to post this topic

Why result.jsp is directly inside tomcat/webapps ? it should be somewhere under your application root directory.

hai Sudhir!

Tried that also,did not work.Is there anything wrong with my jsp file.

Thanks
vinal

Can you access the result.jsp directly by typing it in the browser address bar?

This "RequestDispatcher view=request.getRequestDispatcher("/result.jsp")" is being interpreted relative to the current context root. So, make sure your jsp is in the right place. As already suggested, try putting your jsp at the root of your wepapp.

I could not properly display the file structure.sorry.

under myapplication,I have

result.jsp
form.html
WEB-INF

under WEB-INF, I have

classes

-------

thank you,Vinal