Comments for John Hite's Weblog

Comment on GWT/GXT and Session Timeouts by Annuk

Annuk — Mon, 06 Dec 2010 14:18:33 +0000

Hii john,
great work…
I tried implementing your solution.
In web.xml the session timeout was set to 1.
But when i implement your code.it calls the checkusersession method after every minute and the session is still active.it never calls the login page after a minute.

It should call the login page after a minute???

Comment on GWT/GXT and Session Timeouts by nicola

nicola — Mon, 18 Oct 2010 12:38:24 +0000

some things were cut off from my response… I put pseudo code in <> without quoting them… I will correct soon

Comment on GWT/GXT and Session Timeouts by nicola

nicola — Mon, 18 Oct 2010 11:49:54 +0000

Hi John, in my algorithm I consider:
- session duration
- session creation time
- last valid access time (last access to the server which wasn’t for retrieving session data)
- last request for session

In my implementation i first launch session handling when the login has been done. So I retrieve the first two parameters specified above from the server, save them in instance variables, set the to and to ; then I schedule the next session check for - , where is the gap of which the control anticipates the real server session expire (I setted it to 20 seconds for having the time to do a couple of attempts in case of error).
So now the control passes to a method that checks the session periodically.
For checking the validity of the session I retrieve the same two parameters from the server (session duration and creation time). First, if the session creation time retrieved now and that stored in the instance variable are different I unvalidate the session: this scenario shouldn’t happen often.
Then I calculate the time passed between the last valid request (i.e. request not for retrieving session data and this request): if this time is more than + (some as above) i make logout.
Otherwise the session is valid, so I set to the time retrieved in this check, then I schedule the next check of - + . I hope that my article is clear and the english isn’t too wrong. I’m waiting for the response, bye

nic

Comment on GWT/GXT and Session Timeouts by John

John — Sun, 10 Oct 2010 18:43:20 +0000

I’d be interested in hearing more details. If you have a blog with the details I can link to it. Or if you just give me the details I’ll update my post with your suggestions. Thanks!

Comment on GWT/GXT and Session Timeouts by nicola

nicola — Wed, 06 Oct 2010 11:05:40 +0000

Hi John, good post: I was looking for a solution for this problem and now I implemented it thanks your post (and the post you readed too).
The principle that I adopted is the same you exposed but with some slight differences: I retrieve data from server a few before the session has to expire and on the client I use a session length a few less than that on the server. Generally the session expires at the right moment (counting the last user activity that involved the server), only a few before than server session would have expired.
If you want I can be more detailed, cheers

Comment on Redirecting System.out to a JTextArea by John

John — Sat, 18 Sep 2010 19:52:11 +0000

@Emmanuel
Well, it really depends on what you are doing. I’m assuming that you have a swing project and have a main method of some sort. That’s probably the place to do it. You just have to add a JTextArea somewhere in your application then use the code in my second code block to initialize the TextAreaOutputStream.

Comment on Redirecting System.out to a JTextArea by Emmanuel

Emmanuel — Sat, 18 Sep 2010 13:07:03 +0000

how do i implement your codes into my project?
where should the codes be?

Comment on Redirecting System.out to a JTextArea by Zhelyan

Zhelyan — Fri, 30 Apr 2010 11:58:59 +0000

Extremely fast, well done