RE: Strange error using JPEG/SVGSerializier under heavy load - ClassCastException

[Stefan Seifert <ss...@pro-vision.de>]

After a lot of resarching and debugging i found the source of this problem - a (minor) bug in Batik, that only appeared because some now unneeded code lines in the Cocoon SVG Builder.
I submitted a patch to Bugzilla: #11856.
I will submit a patch to Batik too, to resolve the real source of this problem.

Stefan

> -----Original Message-----
> From: Vadim Gritsenko [mailto:vadim.gritsenko@verizon.net]
> Sent: Wednesday, August 14, 2002 4:42 PM
> To: cocoon-users@xml.apache.org
> Subject: Re: Strange error using JPEG/SVGSerializier under 
> heavy load -
> ClassCastException
> 
> 
> Stefan Seifert wrote:
>  > Hello Vadim.
>  >
>  > The Problem from the other thread is possibly related - 
> but i do not
>  > use saxon nor changed the default configuration of cocoon-2.0.3
>  > concerning XSLT processor usage (at least i'm not aware of this - i
>  > did some updates from earlier cocoon version, but always 
> tried to get
>  > all changed configurations from the new cocoon.xconf etc.).
>  >
>  > Again, my XML streams transformed are not that big 
> (usually < 100kb),
>  > and the resulting JPEG is really small (~2-3kb). But 
> perhaps the bug
>  > appears by either big XML input files or a long runtime (points to
>  > small errors summing up and finally resulting in the error 
> - but why
>  > then a ClassCastException??).
>  >
>  > Unfortunately i have not found a way to reproduce the problem by
>  > force; in that case i would try to debug it. Perhaps i will try to
>  > "blow up" my XML input streams and see if i  can produce 
> the problem
>  > that way.
> 
> You could try...
> 
> 
>  > But i'm not sure if it has really to do something with the
>  > other thread.
> 
> May be not, but these ClassCastExceptions look very 
> suspiciously to me.
> 
> Vadim
> 
> 
>  > Stefan
>  >
>  >
>  >
>  >> -----Original Message----- From: Vadim Gritsenko
>  >> [mailto:vadim.gritsenko@verizon.net] Sent: Wednesday, August 14,
>  >> 2002 3:49 PM To: cocoon-users@xml.apache.org Subject: Re: Strange
>  >> error using JPEG/SVGSerializier under heavy load -
>  >> ClassCastException
>  >>
>  >>
>  >> Stefan Seifert wrote:
>  >>
>  >>
>  >>> Configuration: Cocoon 2.0.3, Tomcat 3.2.3. We use the
>  >>> SVGSerializer with JPEG-Output to generate
>  >>
>  >> graphical menus (we could not get the customer to use only plain
>  >> text menus).
>  >>
>  >>> All works fine after a starting up tomcat. But after a few
>  >>
>  >> days (variing) without even touching the server the SVG 
> Generantion
>  >> fails with the Error below - a ClassCastException. Every following
>  >> request of a JPEG generation failes with the same error.
>  >>
>  >>> All other requests processing only HTML still work!
>  >>>
>  >>> This error is very strange, because all works until the SVG
>  >>
>  >> Serialization seems to hang up totally (but only the SVG
>  >> Serialization).
>  >>
>  >>> The memory utilisation is normal. There are no
>  >>
>  >> OutOfMemory-Erros or anything that points to a memory leak.
>  >> Unfortunately it was not possible to reproduce this problem by
>  >> force using a web stress tool, it only happens on the live servers
>  >> and only after a few days.
>  >>
>  >>> After a tomcat restart all works well again.
>  >>>
>  >>> Any ideas? I searched the mailing lists of Cocoon and Batik
>  >>
>  >> but found hints.
>  >>
>  >>> We tried replacing the batik 1.5beta2 shipped with Cocoon
>  >>
>  >> 2.0.3 with the latest 1.5 beta3, same problem.
>  >>
>  >>>
>  >>>
>  >>
>  >> I wonder is it related to this thread or not:
>  >> http://marc.theaimsgroup.com/?t=102795224000002&r=1&w=2
>  >>
>  >> Vadim
>  >>
>  >>
>  >>> Stefan
>  >>
>  > ...
> 
> 
> 
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