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Posted to general@xml.apache.org by Jay Walters <jw...@computer.org> on 2001/12/23 04:22:45 UTC
Crimson Problem
Iam finding that Crimson is very slow at performing validating parsing
of a specific XML input & DTD that I am using, where very slow is
something like > 1000X slower when validating. Oddly enough I'm also
seeing the same problems with Xerces 1.4 and 2.0 only if I use the Jaxp
interfaces. If I go right into xerces and use the DOMParser class then
it parses in a matter of a few seconds.
If I do a little profiling of the crimson execution I see all time
(essentially) is spent in ContentModel.emtpy().
Cheers
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Re: Crimson/Xerces JAXP Problem
Posted by Jay Walters <jw...@computer.org>.
Sorry it's been a while. With crimson I am using the DOMEcho sample
program. It takes 3s with DOMEcho <xml file> and much much longer
(hours?) with DOMEcho -v <xml file>. This is true whether I use
crimson.jar or xercesImpl.jar from the 2.0 Beta4 release. Either way it
runs in < 10s with the Writer example from Xerces 2.0 Beta4 release.
Perhaps that one doesn't really validate if -v is turned on? I would be
happy to send along the xml file and dtd if that would help. It's the
standard uml13.dtd file and a pretty small class model (< 2000 lines) in
the XML file.
Cheers
Edwin Goei wrote:
>
> Jay Walters wrote:
> >
> > Iam finding that Crimson is very slow at performing validating parsing
> > of a specific XML input & DTD that I am using, where very slow is
> > something like > 1000X slower when validating. Oddly enough I'm also
> > seeing the same problems with Xerces 1.4 and 2.0 only if I use the Jaxp
> > interfaces. If I go right into xerces and use the DOMParser class then
> > it parses in a matter of a few seconds.
>
> Hmmm, this doesn't sound right b/c JAXP essentially wraps the Xerces
> DOMParser class so you should get the same performance whether you go
> through JAXP javax classes or Xerces DOMParser. Are you sure you have
> validation turned on when using DOMParser directly?
>
> -Edwin
>
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> In case of troubles, e-mail: webmaster@xml.apache.org
> To unsubscribe, e-mail: general-unsubscribe@xml.apache.org
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Re: Crimson Problem
Posted by Edwin Goei <ed...@sun.com>.
Jay Walters wrote:
>
> Iam finding that Crimson is very slow at performing validating parsing
> of a specific XML input & DTD that I am using, where very slow is
> something like > 1000X slower when validating. Oddly enough I'm also
> seeing the same problems with Xerces 1.4 and 2.0 only if I use the Jaxp
> interfaces. If I go right into xerces and use the DOMParser class then
> it parses in a matter of a few seconds.
Hmmm, this doesn't sound right b/c JAXP essentially wraps the Xerces
DOMParser class so you should get the same performance whether you go
through JAXP javax classes or Xerces DOMParser. Are you sure you have
validation turned on when using DOMParser directly?
-Edwin
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