I am new to j2ee and have been trying to understand how cookies work. I am
using tomcat 6.0.13. I have tried setting cookies on client browsers(both IE
& Firefox). However, it never succeeds. mostly am getting a
NullPointerException. I narrowed it down to the part of code where cookies
get retrieved. There are no cookies being returned with the response object.
When i displayed the header info there were no cookies being set at all. I
know that cookies are the default option for session handling and therefore,
are turned on by default. As you can see the code works if i comment out the
cookies retrieval.
However, I still tried to set it to true in the context.xml file. which
didn't work. Then tried to set a context element in Host in server.xml.
Needless to say that didn't work either. Now am at my wits end as to why it
is not working. i am attaching the servlet code below:
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CookieServlet2 extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
Cookie c1 = new Cookie("userName", "Sandeep");
Cookie c2 = new Cookie("password", "password");
response.addCookie(c1);
response.addCookie(c2);
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>Cookie Test</TITLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("Please click on the button to see the " +
"cookies sent to you.");
out.println("<BR>");
out.println("<FORM METHOD=POST>");
out.println("<INPUT TYPE=SUBMIT VALUE=SUBMIT>");
out.println("</FORM>");
out.println("</BODY>");
out.println("</HTML>");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>Cookie Test</TITLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("<H2>Here are all the headers: </H2>");
Enumeration enumer = request.getHeaderNames();
while(enumer.hasMoreElements()) {
String header = (String) enumer.nextElement();
out.print("" + header + "");
out.print(request.getHeader(header) + "<BR>");
}
out.println("<BR><BR><H2>And here are all the cookies</H2>");
/*Cookie[] cookies = request.getCookies();
int length = cookies.length;
out.println(length);
for(int i=0;i<length;i++) {
Cookie c=cookies[i];
out.println("Cookie Name: " + c.getName() + "<BR>");
out.println("Cookie Value: " + c.getValue() + "<BR>");
}*/
out.println("</BODY>");
out.println("</HTML>");
}
}
any help will be appreciated
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