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Subject Large Scale Deploymenet on Tomcat ?
Date Tue, 28 Oct 2003 03:13:42 GMT

Hi !
Are there any success stories of deploying a large scale application
(10000+ users ) on tomcat+jboss out there ? Really need to convince the top
bosses down here to give it a chance :)


             Justin Ruthenbeck
   >                                                    To
                                       "Tomcat Users List"
             28-10-03 08:26 AM         <>

             Please respond to                                     Subject
               "Tomcat Users           Re: Form Double Submit Detection

Agreed.  One word of caution...

At 06:46 PM 10/27/2003, you wrote:
>I've had to do this before when credit card processing was being done. A
>double-click can result in the credit card being charged twice, so
>you've really got to avoid it.
>We actually synchronized on the session for the duration of the
>processing, and then set a flag in the session once the processing was
>done. Any subsequent attempts would be flagged as duplicates and you'd
>just get a results screen.

You aren't guaranteed to have the same HttpSession object for every
request -- HttpSession is an interface which is implemented internally
and wrapped by a facade.  Synchronizing on the actual object you get from
req.getSession() can potentially leave you synchronizing on totally
different objects.


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