Cookies not persistent ... how can it be?

vik nuckchady

Greenhorn

Posts: 25

posted 16 years ago

Hi i have a problem with cookies.
I am trying to implement cookies but i cannot get the cookie to remain persistent till after the session (i.e it dies when i close the browser).
I have written the code in JSP using the Cookie API that i've found on Sun's Site. My application server (the one that parse the jsp and compiles it to a servlet) is Allaire's JRun.
I've made two JSPs (setCookie.jsp and getCookie.jsp). Here they are:
//---------- setCookie.jsp ----------
<%
// Verifying if cookie already exist on user machine.
Cookie[] c=request.getCookies();
if(c!=null)
{
for(short i=0;i<c.length;i++)
{
if(c[i].getName().equals("tecinCookie"))
{
// Deleting those old cookies.
c[i].setMaxAge(0);
response.addCookie(c[i]);
}
}
}
//Creating a new cookie.
Cookie cookie=new Cookie("myCookie","bla");
// Lifetime of cookie is 3 mins (180s)
cookie.setMaxAge(180);
response.addCookie(cookie);
%>
//---------- getCookie.jsp ----------
<%
Cookie[] c=request.getCookies();
if(c!=null)
{
for(short i=0;i<c.length;i++)
out.println(c[i].getName()+" "+c[i].getValue
()+"<br>");
}
else
{
out.println("No cookies received");
}
%>
When i run the second JSP (getCookie.jsp) during the same session i only get a "jsessionid" cookie which seems strange.
When i run the second jsp in another session i get no cookies at all (i understand that the above mentioned jsessionid cookie would die).
My problem is that the cookie "myCookie" does not get written at all. Can you explain why is that so.
Thanks in advance.

Anonymous

Ranch Hand

Posts: 18944

posted 16 years ago

Listening

maha anna

Ranch Hand

Posts: 1467

posted 16 years ago

Vik,
Here is an example code for persistant cookie. PLease try it!

http://www.javaranch.com/ubb/Forum7/HTML/003159.html
regds
maha anna

vik nuckchady

Greenhorn

Posts: 25

posted 16 years ago

Hello Anna
I've tried that code you proposed at that link. I still have problems. I tested that code on the following application web servers:
- JRun (Allaire)
- ATG Dynamo (ATG)
- Managed to get it working on (Tomcat)
Believe that the servlet.jar files that come along jRun or ATG were faulty, so i used the one that come with Tomcat but to no avail.

I am not saying that the code is wrong but could you at least test mine on your server or tell me if you know of some configuration that i must set somewhere.
Thanks again for the hand.

//------------ setCookie Servlet ---------------/
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class setCookie extends HttpServlet
{
public void doPost(HttpServletRequest req, HttpServletResponse rsp)
throws IOException,ServletException
{
doGet(req, rsp);
}
public void doGet(HttpServletRequest req, HttpServletResponse rsp)
throws IOException,ServletException
{
//------ Temporary cookie --------
Cookie cookie=new Cookie("session-cookie","session-value");
cookie.setMaxAge(-1);
cookie.setPath("/");
rsp.addCookie(cookie);
//------ Persistent cookie ---------
cookie=new Cookie("persistent-cookie","persistent-value");
cookie.setMaxAge(3600);
cookie.setPath("/");
rsp.addCookie(cookie);
rsp.setContentType("text/html");
PrintWriter pw=rsp.getWriter();
pw.println("<html><body>Cookies Has been Written</body></html>");
pw.close();
}
}
//------------ getCookie JSP---------------/
<html>
<head>
<title>Get Cookie</title>
</head>
<body>
<%
Cookie[] c=request.getCookies();
if(c!=null)
{
for(short i=0;i<c.length;i++)
{
out.println(c[i].getName()+"��"+c[i].getValue()+"<br>");
}
}
else
{
out.println("No cookies received");
}
%>
</body>
</html>

Cheers Vik

[This message has been edited by vik nuckchady (edited May 16, 2001).]
[This message has been edited by vik nuckchady (edited May 16, 2001).]

maha anna

Ranch Hand

Posts: 1467

posted 16 years ago

Vik,
Verified with JRun3.0 free Developer Edition and able to see all 6 cookies in showCookies.jsp. If I quit browser and restart a new IE browser, able to see only those 3 persistant cookies, which is expected behaviour. Here is the procedure.

Please note C:\Program Files\Allaire\JRun is my JRun installation dir.

1. Start "default server"
   Start -> Programs -> JRun3.0 -> JRun Default Server
  [If server is successfully started, you should be able to the DefaultServer Icon in System Tray. 
(see at bottom-right corner of your screen) ]

1. Save showCookies.jsp as \
  C:\Program Files\Allaire\JRun\servers\default\demo-app\jsp\showCookies.jsp
2. Save SetCookies.java as 
C:\Program Files\Allaire\JRun\servers\default\demo-app\WEB-INF\classes\SetCookies.java
3. cd C:\Program Files\Allaire\JRun\servers\default\demo-app\WEB-INF\classes and compile servlet.
 
     javac SetCookies.java
4. Set persistant cookies. For this, from browser type
   <A HREF="http://localhost:8100/demo/servlet/SetCookies" TARGET=_blank>http://localhost:8100/demo/servlet/SetCookies</A> 
   (Note 8100 is the port used for "default server")
5. Call jsp as <A HREF="http://localhost:8100/demo/jsp/showCookies.jsp" TARGET=_blank>http://localhost:8100/demo/jsp/showCookies.jsp</A> 
   You can see this output at browser
 
I = 0 Name = Persistent-Cookie-0 Value= Cookie-Value-P0 
I = 1 Name = Persistent-Cookie-1 Value= Cookie-Value-P1 
I = 2 Name = Persistent-Cookie-2 Value= Cookie-Value-P2 
I = 3 Name = jsessionid Value= 249843990032140120 
I = 4 Name = Session-Cookie-0 Value= Cookie-Value-S0 
I = 5 Name = Session-Cookie-1 Value= Cookie-Value-S1 
I = 6 Name = Session-Cookie-2 Value= Cookie-Value-S2 
6. Quit this browser and  start a new browser. The output is :

I = 0 Name = Persistent-Cookie-0 Value= Cookie-Value-P0 
I = 1 Name = Persistent-Cookie-1 Value= Cookie-Value-P1 
I = 2 Name = Persistent-Cookie-2 Value= Cookie-Value-P2 
which is what expected.    [img]http://www.javaranch.com/ubb/smile.gif[/img]

Please follow these steps and let us know what you get.

regds
maha anna

[This message has been edited by maha anna (edited May 16, 2001).]

vik nuckchady

Greenhorn

Posts: 25

posted 16 years ago

Hello Maha Anna
Thanks a lot for helping out.
I think i've found the cause of these problems. Well i am not sure if they are supposed to be like that. But in any case i get the desired result.
Both ATG Dynamo and jRun3.0 they tend to do session management besides being just plain simple dumb application servers

. So they have these settings that are defaulted such that you have situations where cookies die after a session.
For example in ATG Dynamo5.1 they have a component called sessionManager where there is a boolean field called usingCookies set to true. In JRun, a simillar field is also set to true etc.
So what i have done is make the required changes and my app seems to operate more or less ok. That is the cookies persist.
I might be wrong in my understanding of that problem. If it is so can you please comment. Otherwise i think that this thread can be closed

Thanks a zillion for your help and concern
Cheers
Vik

It is sorta covered in the JavaRanch Style Guide.

Cookies not persistent ... how can it be?

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