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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Why does Tomcat use xerces under java 1.4 instead of the internal jvm classes?
Date Wed, 02 Apr 2003 21:31:08 GMT

Howdy,
I've used Ant's <xmlproperty> task to validate web.xml as part of
deployment...

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Costin Manolache [mailto:cmanolache@yahoo.com]
>Sent: Wednesday, April 02, 2003 4:25 PM
>To: tomcat-dev@jakarta.apache.org
>Subject: Re: Why does Tomcat use xerces under java 1.4 instead of the
>internal jvm classes?
>
>Jean-Francois Arcand wrote:
>
>>
>>
>> Costin Manolache wrote:
>>
>>>Jean-Francois Arcand wrote:
>>>
>>>
>>>
>>>>>At least in tomcat5 I never use xerces - only the bundled parser,
and
>so
>>>>>far I've seen no problems.
>>>>>
>>>>>
>>>>>
>>>>Crimson is a very good parser, and it still faster that Xerces in
some
>>>>case. The only reason I see for bundling xerces is for when we turn
on
>>>>validation & the web.xml used a schema for validation.
>>>>
>>>>
>>>
>>>So why not making the "web.xml validator" a separate download ? If
>>>people want to turn on validation, they'll need to get the validator
-
>>>which will include xerces and some simple script to do the
validation.
>>>
>>>
>> That means removing DTD validation from the current implementation?
For
>> me, seems a feature regression. If we stop validating, we should have
a
>> very good documentation  in other to avoid confusion and hours or
>> debugging.
>
>No, I'm not sugesting to remove DTD validation.
>
>Just that it hurts people - and without too much gain.
>
>But it's actually the reverse - the DTD validation is the one that
causes
>confusion and hours of debugging ( plus slow startup time ). Good
software
>should be tolerant with the user input.
>
>A tool that generates the web.xml should be strict and make sure the
output
>is valid. A user who wants to be sure the webapp it ships is correct
should
>validate the web.xml ( against DTD or schema ). A deploy tool could
also
>validate web.xml and the tlds.
>
>It is too late to change the behavior for DTD ( for backward compat,
etc ),
>but at least schema validation can be avoided.
>
>BTW - in the web.xml files that I write I usually remove the
declaration on
>the top ( to make sure the validation doesn't happen ).
>
>
>Costin
>
>
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