File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Servlets and the fly likes notification not as expected from session binding listener Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Java Interview Guide this week in the Jobs Discussion forum!
JavaRanch » Java Forums » Java » Servlets
Reply locked New topic

notification not as expected from session binding listener

sasikumar palakkizhi

Joined: Sep 11, 2005
Posts: 29
Hi all,

When i was practising one HttpSessionBindingListener program from HFSJ, I noticed that the listener methods are not producing the results as I expected.

The program was to print 'bound', when an object of type X is bound to the session and print 'unbound', when it is unbound. I added the object of type X two times using the code. The session attributes with name "sample" has been set in the valueBound and valueUnbound methods for monitoring in the doGet method of the servlet.

( relevant parts shown below ; request, session and pw are Servletrequest,HttpSession and PrintWriter objects).


The code used for the class implementing HttpSessionBindingListener X is

Result obtained is

I expected that when I bind "new X()" for the second time to the same key, the first bound object will be removed and the valueUnbound method will be called(as well as valueBound). This is not happening. why?

"System.out.print("B")" ( commented in the question) is not producing any output.why

Please help in this topic.

thanks in advance
Bear Bibeault
Author and ninkuma

Joined: Jan 10, 2002
Posts: 63870

Please do not post the same question more than once.

[Asking smart questions] [About Bear] [Books by Bear]
It is sorta covered in the JavaRanch Style Guide.
subject: notification not as expected from session binding listener
It's not a secret anymore!