Re: [PROPOSAL] Jasper, Use XML parser to improve error reporting of JSP taglib problems

[Ken X Horn <ho...@jpmorgan.com>]

Slow, possibly, but at compile time who cares?

On a similar topic, instead of Jasper generating reams of reflection based code
for the JSP runtime, could CORBA style interfaces be generated for the tags
(should the tags implement these?) - to speed up the request processing - rather
than loading the tag instances via introspection? This isn't in the spec but i
think it would be a good way to move.






nixnixnix@yahoo.com on 25/07/2000 10:43:24

Please respond to tomcat-dev@jakarta.apache.org; Please respond to
      nixnixnix@yahoo.com

To:   tomcat-dev@jakarta.apache.org
cc:   (bcc: Ken X Horn)
Subject:  Re: [PROPOSAL] Jasper, Use XML parser to improve error reporting of
      JSP  taglib problems




Sounds like it would be slooooow.

--- Eduardo Pelegri--Llopart
<Ed...@eng.sun.com> wrote:

> > Proposal:
> >
> > Use an XML Parser to do validation of JSP pages
> which use a taglib.
> > An XML Parser does a much better job of reporting
> malformed XML than
> > Jasper does reporting errors when parsing tag lib
> elements.
> >
> > Implementation:
> >
> > Detect if one or more taglib directives are in
> jsp.
> >
> > Load and validate tld's for taglibs, create a DTD
> for
> > each tag lib. DTD's for taglibs should be cached
> by Jasper
> > for later reuse.  Perhaps XSLT could be used to
> transform
> > the tld into a dtd?
> >
> > Strip any HTML and/or scriptlets from the JSP that
> are not
> > inside an XML element, do not remove any lines so
> that any
> > errors report the correct line numbers. A regexp
> can probably
> > handle this.
> >
> > Add the correct XML document headers to the
> stripped JSP.
> > Each taglib being used in the JSP will have its
> own namespace.
> >
> > Pass the document to a DOM parser and report back
> any errors.
> >
> > Continue on with normal processing of JSP.
> >
> > In the future the parsed document may come in
> handy for
> > generating the servlet code.  But for now I am
> only interested
> > in bettor error reporting.
> >
> > Comments?
> >
> > Regards,



=====
# Nick Bauman
# Technical Programmer
# http://webhelp.com
# real software, real code, real time

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