New Session is created between consecutive servlet request from an Applet and a managed bean??

Question

Hi, I want to pass parameters betweeen applet and jsf components So when a value of a input textbox changed, its binding backing bean makes connection to a servlet. The servlet create an attribute and save to HttpSession using (request.getSession(true)).setAttribute(name, value);

Then at some event, applet will access another servlet. This servlet will try to retrieve the Attribute saved to Session previously.

However, everytime, the attirbute returned is null as the new session is created instead.

My question is: Is the session should be persist? ( I checked allowcookies, session timeout for weblogic)

If yes, what might go wrong with my app?

Thanks a lot for your help.

Regards K.

Answer 1

Sessions are backed by cookies. In a JSP/Servlet environment the cookie name is jsessionid. To access the same session, the applet has to fire a request with the desired session cookie in the header. Also, you need to ensure that the servlet is running/listening in the same domain and context.

To start, pass the session ID as a parameter to the applet:

<param name="jsessionid" value="${pageContext.session.id}">

Then, in the Applet connect the Servlet as follows:

String jsessionid = getParameter("jsessionid");
URL servlet = new URL(getCodeBase(), "servleturl");
URLConnection connection = servlet.openConnection();
connection.setRequestProperty("Cookie", "jsessionid=" + jsessionid);
// ...

Here servleturl obviously should match servlet's url-pattern in web.xml. This should give the same session back in the servlet on request.getSession().