Well i can not load image i have puted in the images folder.gives null pointer exception

import javax.servlet.*;

import javax.servlet.http.*;

import java.util.*;

import java.net.*;

public class SetCookie extends HttpServlet

{

public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException, ServletException

{

res.setContentType("image/gif");

ServletOutputStream sop=res.getOutputStream();

System.out.println(getServletContext().getResourceAsStream("c:/tomcat2/webapps/examples/images/code.gif"));

int ival=is.read();

while(ival!=-1)

{

sop.write(ival);

ival=is.read();

}

}

}