HttpSession get and setAttribute problem

[raj guntupalli]

I feel rather strange that my program recognises HttpSession but not its two methods.can anyone help me out.Heres the code.

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpSession;
import java.util.*;
import java.io.*;
public class HttpSession1 extends HttpServlet
{
public void doPost(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException
{

 HttpSession session=req.getSession(true);
 List listOfItems=(List)session.getAttribute("listofitems");
 if(listOfItems==null)
 {
 listOfItems=new Vector();
 session.setAttribute("listofitems",listOfItems);
 }
 String code=req.getParameter("code");
 String command=req.getParameter("command");
 if("additem".equals(command))
 {
 listOfItems.add(code);
 }
 else if("removeitem".equals(command))
 {
 listOfItems.remove(code);
 }
   }
}

[ January 14, 2003: Message edited by: Cindy Glass ]

[Dominic Paquette]

Hi,
I don't understand the question, what do you mean by "my program recognises HttpSession but not its two methods" ?
Dominic

[Susil Parida]

Hi,
Your server's servlet API may be older than 2.2 . Try with getValue() and setValue()
It will work.
Regards
Susil

[raj guntupalli]

hi thanx but still it does not work..It gives me two errors
1)cannot resolve symbol method getAttribute() (or getValue)
2)cannot resolve symbol method setAttribute() (or
setValue()).

[Sam Dalton]

Originally posted by raj guntupalli:
hi thanx but still it does not work..It gives me two errors
1)cannot resolve symbol method getAttribute() (or getValue)
2)cannot resolve symbol method setAttribute() (or
setValue()).

Can you give us some more details?
a) What web container are you using, and in particular which version?
b) When do you recieve this error? At compilation or run time?
Cheers
Sam

[Asher Tarnopolski]

your code was compiled without any problem.
so, copy the fulle error message you get and post it here... may be we'll be able to learn something from it.

[Mark Howard]

Hi Raj
I ran your code exactly as you posted it and it worked fine for me. I can only assume that there is some environmental hassle.
I'm also a bit confused by your HttpSession being recognised but not it's methods? Is this at compile-time or run-time?
Mark.

[raj guntupalli]

Hi,
I am getting the problem at compile time.All other servlets are working fine but I have only problem with this program.I am using tomacat 4.0.1 as my server and the servlet.jar file I used in ext of jdk1.3.1 jre is from jsdk1.2.Thanx for your help guys.

[raj guntupalli]

C:\Program Files\Apache Tomcat 4.0\webapps\esession\HttpSession1.java:13: cannot resolve symbol
symbol : method getAttribute (java.lang.String)
location: interface javax.servlet.http.HttpSession
List listOfItems=(List)session.getAttribute("listofitems");
^
C:\Program Files\Apache Tomcat 4.0\webapps\esession\HttpSession1.java:17: cannot resolve symbol
symbol : method setValue (java.lang.String,java.util.List)
location: interface javax.servlet.http.HttpSession
session.setValue("listofitems",listOfItems);
^
2 errors
Process completed.
esession is a ordinary folder in webapps.Thanx

[DC Dalton]

First of all you are using session methods from 2 different APIs. getValue() & putValue() have been deprecated & you should now use getAttribute() & setAttribute()...if your using the newest API, if not use the first two.
What is odd is that one of the two should work, depending on which API you are using, so you should only get one compiler error.
I ran the code thru my machine with no compiler errors at all....I have to agree that either something is wrong with your environment or you may just have a corrupt servlet.jar. (Stranger things have happened) If you want to get a new one Ive uploaded mine to www.dcddesigns.com/servlet.jar that way you can get to it in a browser, download it & override yours. You might want to try that......

[Malhar Barai]

Originally posted by raj guntupalli:
C:\Program Files\Apache Tomcat 4.0\webapps\esession\HttpSession1.java:13: cannot resolve symbol
symbol : method getAttribute (java.lang.String)
location: interface javax.servlet.http.HttpSession
List listOfItems=(List)session.getAttribute("listofitems");
^
C:\Program Files\Apache Tomcat 4.0\webapps\esession\HttpSession1.java:17: cannot resolve symbol
symbol : method setValue (java.lang.String,java.util.List)
location: interface javax.servlet.http.HttpSession
session.setValue("listofitems",listOfItems);
^
2 errors
Process completed.
esession is a ordinary folder in webapps.Thanx

hi dear
the problem is with your LIST & not SESSION...just check out the docs for list on java.util.List

MB
[ January 09, 2003: Message edited by: Malhar Barai ]

[raj guntupalli]

Thank you very much.As you have said I had the problem with servlet.jar.After Downloading the servlet.jar from you and replacing it the program compiles fine.Thank you very much once again.Bye