How many Session Objects ??

Hello All,
I want to know that how many users currently communicating with my web-application .Is there
any way to find out Using Java Servlet Api may be using ServletContext .
I appreciate any help .
Saima.

From the Tomcat-Users mailing list:

In a servlet 2.3 environment (Tomcat 4), you can accomplish your goal
without getting into the innards of the container. Simple create and
register an HttpSessionListener, which will be notified every time a
session within your app is created or destroyed -- it's easy to maintain a
local HashMap (or something) of the currently active sessions.
Craig

Does anyone know if there's a way to get some kind of a reference to all of
the active sessions in a webapp? I just want to know how many Sessions
there are.
I'd just like to be able to say something like "There are currently X Number
of users online" on some page.
-Cavan Morris

Hello Carig,
Thanks for your reply ,but actually you repeated my question .As I was also asking about the no of users currently online to communicate simultaneously with any web-aps.
This is interesting thing and there must be some solution .
Thanks anyway .

Saima Khan.

Umm.. I think you need to read that again.

This is Mike, posting a request/response email from two other people, one of whom is named Craig.

(At least one) solution to your problem is *in* that quote. Extrapolate beyond the information given. Think HashMap.size()
[ January 16, 2002: Message edited by: Mike Curwen ]

Hello Mike ,
Sorry for the misunderstanding .
But I am still unable to know the total no of users using HttpSessionListener.
Bye

Well Khan ,
What u need to do is this ..
1) u need to declare a Haspmapor a Hashtable in the class. This u must me doing(i hope) to keep track, that the user doesnt log on two from two machine simaltaneously , any how even if u havent ,no problem .
2) everytime a user logs on to the ur web
application u have to check whether his login name is already there or not . if it is not there u put his name in the map .
3) every time a person logs out, u remove his name from the hashmap
4) now to find out what exactly ur requirement is what u can do is , u can call size() of the hashmap or table .which will return u the count of number of people who are using your application

Thanks a lot Sandeep.
I think now i will solve this if I need anything else further i will let you know .
Thanks again.

hi!
sandeep how do you remove user name from your hastable..in case of session time out..
thankx

Satyendra, you will need to implement the HttpSessionBindingListener interface, and put the code to update the hashtable in the value unbound method.