Getting the SessionID?

Question

I'm trying to get the current session id from an applet and I keep on getting NULL as the session id. Here's the code that I've wrote:
// Define a URL
               url = new URL(queryParam);
               // Get a URLConnection Object
               connection = (HttpURLConnection)url.openConnection();
connection.setRequestProperty("Connection", "close");
connection.setDoOutput(true);
DataOutputStream out=new DataOutputStream(connection.getOutputStream());
//ut.writeBytes(param);
out.flush();
out.close();
System.out.println("send data");
System.out.println("getting cookie");
// Get current Session
cookieHeader = connection.getHeaderField("Set-Cookie");
if(cookieHeader!=null)
int index = cookieHeader.indexOf(";");
if(index >= 0)
cookie = cookieHeader.substring(0, index);
System.out.println("Cookie is : "+ cookie);
System.out.println("Cookie is : "+ cookieHeader);
else
System.out.println("COOKIE IS NULL");
}

Answer 1

If you don't have the current session ID, your applet is going to be given a new one by the server, so you really should write the session ID as an applet parameter in the page:
<applet ...>
<param name="sessionId" value="<%= session.getId() %>" />