Rick,
Simple question, here comes the complex answer :)
I'm a student who's working for my Uni for a year. I'm working on a small
project to look at how best to implement a new Government recommendation -
that all Higher Education institutions in the UK have some sort of Personal
Development Planning (PDP) for students.
The project is funded by the Higher Education Funding Council (HEFC -
"f-ki"), so we don't have a lot of cash! Unlike America, education in the UK
hasn't yet sold out to the big multinationals ("Coca Cola day"). This means
that instead of using a proper server, I'm having to make do with a
workstation - a Sun Ultra 10. I'm no expert on servers, loads, load
balancing and all that, but I should imagine that performance will be a
problem. In view of this, I'm keen to squeeze as much out of the "server" as
I can. The person who actually wrote the servlet recommends using Aelfred
because of it's speed, hence my asking about using a parser other than
Xerces.
Thanks to Charlie, I checked the bug database - didn't think it would be
bug, and it isn't. The bug database mentioned postings on the list about XML
parsers, which I've read. From what I can tell (it isn't too clear):
4.0.1 only works with xerces.jar in common/lib - no per-WebApp parser is
permitted
4.0.4 will allow per-WebApp parsers so long as it implements something
called JAXP - i.e. xerces
Looks like the developers have been reading Microsoft's marketing strategy
:) I might have it totally wrong - I don't fully understand all the stuff
about parsers and classLoaders - nor should I!
Thanks,
John
Quote for the week:
The stupid neither forgive nor forget; the naive forgive and forget; the
wise forgive but do not forget.
Thomas Szasz, The Second Sin (1973)
-----Original Message-----
From: Rick K [mailto:[EMAIL PROTECTED]]
Sent: 13 March 2002 06:09
To: Tomcat Users List
Subject: RE: Problems using own XML parser
Maybe you covered this before, but:
Why doesn't Xerces meet your needs?
I'm not much of an XML expert, I'm just curious.
--- John Wadkin <[EMAIL PROTECTED]> wrote:
> Charlie,
>
> It seems from:
>
>
http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6374
>
>
http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6628
>
> That webApps *can't* have their own parser. Stuck
> with Xerces 1, then! Taken
> a week to find that out :)
>
> Thanks,
>
> John
>
> Quote for the week:
>
> The stupid neither forgive nor forget; the naive
> forgive and forget; the
> wise forgive but do not forget.
>
> Thomas Szasz, The Second Sin (1973)
>
>
> -----Original Message-----
> From: Cox, Charlie [mailto:[EMAIL PROTECTED]]
> Sent: 12 March 2002 16:27
> To: 'Tomcat Users List'
> Subject: RE: Problems using own XML parser
>
>
> see the archives or bugzilla as this was addressed
> in 4.0.3 or 4.0.4b1(I
> don't remember which one)
>
> Charlie
>
> > -----Original Message-----
> > From: John Wadkin [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, March 12, 2002 10:59 AM
> > To: 'Tomcat Users List'
> > Subject: RE: Problems using own XML parser
> >
> >
> > I'm not privy to the workings of the servlet.
> There's a
> > properties file I
> > edit to indicate the name of the SAX driver:
> >
> > #Xerces
> >
> sax.driver.name=org.apache.xerces.parsers.SAXParser
> >
> > OR
> >
> > #Aelfred
> > sax.driver.name=com.microstar.xml.SAXDriver
> >
> > Xerces works fine, but Aelfred doesn't. The driver
> names are
> > correct and as
> > I said, TomCat does load aelfred.jar
> >
> > Yes - I too would like to know if it's possible to
> use another parser!
> >
> > Thanks,
> >
> > John
> >
> > Quote for the week:
> >
> > The stupid neither forgive nor forget; the naive
> forgive and
> > forget; the
> > wise forgive but do not forget.
> >
> > Thomas Szasz, The Second Sin (1973)
> >
> >
> > -----Original Message-----
> > From: Evguenia Krylova
> [mailto:[EMAIL PROTECTED]]
> > Sent: 12 March 2002 15:52
> > To: Tomcat Users List
> > Subject: RE: Problems using own XML parser
> >
> >
> > Isn't it that udner Tomcat 4x you can specify
> class path for a
> > context in server.xml. I saw something like this
> in the
> > comments portion of server.xml. I have not tried
> this, but would
> > like to know if you found a way to use another
> parser with Tomcat.
> >
> > I assume you don't use JAXP API's but call
> alphred's classes
> > directly.
> >
> > Ev
> >
> > -----Original Message-----
> > From: John Wadkin [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, March 12, 2002 9:31 AM
> > To: Tomcat Users List (E-mail)
> > Subject: RE: Problems using own XML parser
> >
> >
> > All,
> >
> > I'd appreciate a response on this otherwise I'll
> just have to
> > assume that
> > TomCat allows only xerces.jar as a parser.
> > The "jsp errors" I mention relate to the default
> servlet for
> > jsp. I tried
> > commenting out (in conf/web.xml) all references to
> this
> > servlet - it just
> > created more errors!
> > The docs give the impression that it's a "simple"
> case of
> > moving xerces.jar
> > and putting your own parser in /WEB-INF/lib, but
> this just
> > doesn't work.
> >
> > Thanks,
> >
> > John
> >
> >
> > -----Original Message-----
> > From: John Wadkin
> > Sent: 09 March 2002 03:04
> > To: Tomcat Users List (E-mail)
> > Subject: Problems using own XML parser
> >
> >
> > All,
> >
> > Tomcat 4.0.1
> > Apache 1.3
> > mod_WebApp
> > Solaris 8
> >
> > I'm trying to use the aelfred parser in a servlet.
> I've read
> > the docs on
> > class loaders and XML but no luck so far.
> >
> > I moved xerces.jar from common/lib to server/lib
> and
> > re-started TomCat. A
> > couple of errors appeared in catalina.out relating
> to the
> > default servlet
> > for jsp's. So I put xerces.jar back in common/lib.
> > I put the aelfred.jar in my web app's WEB-INF/lib
> directory
> > and re-started
> > TomCat. I expected errors relating to the fact
> that two XML
> > parsers existed
> > - there weren't any. The logs show that
> aelfred.jar has loaded but the
> > servlet throws a ClassNotFoundException.
> >
> > Any ideas? The servlet does work with Aelfred at
> another site
> > and it works
> > fine with the xerces parser in common/lib.
> >
> > The reason I'm trying to use Aelfred is that I'm
> told it's faster than
> > Xerces. Is this a fair comment?
> >
> > Thanks,
> >
> > John
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