Hi,
I also have problems with HttpSessionBindingListener.
We run a web application where the main window refreshes itself after 25
minutes. The session timeout in web.xml is set to 30 minutes. The
refresh is to keep the session tracking alive, so the user is not logged
out as long as the main window is open.
In the session we have a single object (params) that implements
HttpSessionBindingListener in order to initialize and cleanup the
params.
The problem is that when run locally (JBuilder6 and Tomcat 3.2.3) and on
internal test server (Tomcat 3.2.3 standalone) sessions are kept alive
fine. But when deployed on our production server (Tomcat 3.2.3
standalone) the session is unbound after approx. 3300 seconds...??
I have made a simple test Servlet (see below), which behaves the same
way.
Any input will be much appreciated.
package net.defgo.test;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.util.Date;
import java.text.SimpleDateFormat;
public class TestServlet extends HttpServlet {
private static final SimpleDateFormat timeFormatter = new
SimpleDateFormat("HH:mm:ss");
//Service the request
public void doGet(HttpServletRequest request, HttpServletResponse
response) {
try {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
BoundObjectSerializable boSession = (BoundObjectSerializable)
session.getAttribute("boSessionDef");
if (boSession == null) {
boSession = new BoundObjectSerializable("js version");
session.setAttribute("boSessionDef", boSession);
System.out.println(timeFormatter.format(new Date()) + ",
boSession = " + boSession + " created");
}
System.out.println(timeFormatter.format(new Date()) + ", id=" +
session.getId());
response.setDateHeader("Expires", 0);
response.setHeader("Pragma", "no-cache");
if (request.getProtocol().equals("HTTP/1.1")) {
response.setHeader("Cache-Control", "no-cache");
}
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0
Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\";>");
out.println("<html>");
out.println("<head>");
out.println("<meta name=\"Language\" content=\"da,en-us\">");
out.println("<meta http-equiv=\"Content-Type\"
content=\"text/html; charset=iso-8859-1\">");
out.println("<script language=\"JavaScript\"><!--");
out.println("var tID = '';\n");
out.println("function executeTimer() {");
out.println(" location.href = '" +
response.encodeURL(request.getRequestURI()) + "';");
out.println("}");
out.println("//--></script>\n");
out.println("</head>");
out.println("<body onLoad=\"tID =
setTimeout('executeTimer()',1500000)>"); // 1500 secs = 25 min
out.println("<p>msg = " + boSession.getSomething() + "</p>");
out.println("</body>");
out.println("</html>");
out.close();
} catch (Exception e) {
e.printStackTrace(System.out);
} // catch
}
}
package net.defgo.test;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionBindingEvent;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.io.Serializable;
public class BoundObjectSerializable implements
HttpSessionBindingListener, Serializable {
private static final SimpleDateFormat timeFormatter = new
SimpleDateFormat("HH:mm:ss");
private String something = null;
private int counter;
private long started;
public BoundObjectSerializable(String something) {
this.something = something;
started = System.currentTimeMillis();
}
public String getSomething() {
return something + " counter=" + counter++ + " session duration = "
+ (System.currentTimeMillis() - started)/1000 + " secs";
}
public void valueBound (HttpSessionBindingEvent event) {
System.out.println (timeFormatter.format(new Date()) + ",
valueBound: I've been bound to \"" + event.getName () + "\" for session
id: " + (event.getSession()).getId ());
}
public void valueUnbound (HttpSessionBindingEvent event) {
System.out.println (timeFormatter.format(new Date()) + ",
valueUnbound: I've been unbound from \"" + event.getName () + "\" for
session id: " + (event.getSession ()).getId () + " session duration = "
+ (System.currentTimeMillis() - started)/1000 + " secs" );
}
}
Best regards
HC Hammerstoft
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