HttpSessionBindingEvent.getValue() Bug in OC4J 10.1.2.0.2

Question

Hello,
I thing we have found a bug in the implementation of the getValue() method from the HttpSessionBindingEvent Interface. When the HttpSessionBindingListener methods valueUnbound or valueBound are called, the event returned null for the getValue() invocation.
We have tested the code on oc4j, Tomcat and WebShere Application Server. Only oc4j retuned a null value for an existing object.
If someone knows that we are wrong, please post your knowledge.
Greetings
Carsten E.

Answer 1

i also faced the same problem. the following are my codes under jdeveloper 9i
package com.servlets;
import java.io.IOException;
import java.io.Serializable;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
public class SessionBindingServlet extends HttpServlet {
public void doGet( HttpServletRequest req, HttpServletResponse res )
throws ServletException, IOException {
HttpSession session = req.getSession();
session.setAttribute( "cone", new KnowAllItem( "snake eyes" ) );
session.removeAttribute( "cone" );
res.getWriter().println( "check your console..." );
* By implementing HttpSessionBindingListener, KnowAllItem objects get
* informed when they are added and/or removed from a servlet session
* Also, remember to make you session items serializable
class KnowAllItem implements HttpSessionBindingListener, Serializable {
private String id;
public KnowAllItem( String theId ) {
id = theId;
public void valueBound( HttpSessionBindingEvent evt ) {
System.out.println( "added KnowAllItem to session -> " + dump( evt ) );
public void valueUnbound( HttpSessionBindingEvent evt ) {
System.out.println( "removed KnowAllItem from session -> " + dump( evt ) );
private String dump( HttpSessionBindingEvent evt ) {
return "\n attribute name: " + evt.getName() + "\n session: " +
evt.getSession() + "\n attribute value: " + evt.getValue();
public String toString() {
return id;
}