RE: [Webware-discuss] crash on double click

[sandra r. <mil...@ho...>]

this happens with any servlet...

I tried this on my machine and it doesn't really happen. I think this is 
because my connection to
the server is so fast that I dont have enough time to make a double click. 
But I've got a  coworker that is doing the tests. He has a slower connection 
and if he just make more than one click on any button on a form..the server 
crash down.

For example: I have a servlet that calls a function that inserts(create) 
something in a database.
When the user makes double click on "Create" instead of just one click..the 
server try and try to
make the insert..and at the end..just gets blank.

other times it shows a database error of "duplicated key". I  understand 
this is because the server
try to process the two request..but I need to control this..and only permit 
one process.

likewise..we also have a little similar problem with frames..because the 
frame called two servlets
at the same time..and we had to make a delay in one of them with javascript


Most of my code is just operations to a database..It doesn't do anything 
weird..I dont handle
threads or anything like that.


thanks.


>From: Geoffrey Talvola <gta...@na...>
>To: 'sandra ruiz' <mil...@ho...>, 
>web...@li...
>Subject: RE: [Webware-discuss] crash on double click
>Date: Wed, 10 Dec 2003 10:15:51 -0500
>
>sandra ruiz wrote:
> > hi, list..i'm not quite sure if this problem its because of
> > Weware..but when a user makes double click
> > on a button in a form the server crash down..and returns a blank page.
> >
> > when i look for in the log of apache I get this error:
> >
> > [Fri Oct 24 16:15:31 2003] [error] [client 192.168.25.20] (20507)The
> > timeout specified has expired: ap_content_length_filter:
> > apr_bucket_read() failed,
> > referer:..........
> >
> > I've looked for this error in Internet..but I've couldn't
> > find an answer..
> >
> > The timeout of my apache is 5 minutes. that's enough for me.
> > I am using
> > webware 0.8
> >
> > thanks in advance.
>
>Need more details.  Does this happen with _any_ servlet, or only with one
>particular servlet?  If with one servlet, then what is that servlet doing
>when you click the button?
>
>Double-clicking the button will cause two identical requests to be POST'ed
>at almost the same time.  If your code has thread-safety problems this is
>one way to trigger them... but Webware itself is capable of handling this
>fine.
>
>- Geoff
>
>
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