Re: [Axualize-users] class loading via jar files

[Russell W. <rus...@ya...>]

The reason for the <relative-url> tag's existance is simply to aid those
developers who compose JSPs in an XML editor that supports schemas. Here is
what I mean.

<load-classes
href="<jsp:expression>request.getAttribute("foo")</jsp:expression>"/>

is not legal XML (at least not until it has been processed by the servlet
container) so the editor will complain when you save it since it cannot be
validated.

but...

<load-classes>
  <relative-url>
    <jsp:expression>request.getAttribute("foo")</jsp:expression>
  </relative-url>
</load-classes>

or ..

<relative-url id="myURL">
  <jsp:expression>request.getAttribute("foo")</jsp:expression>
</relative-url>
<load-classes>
   <object idref="myURL"/>
</load-classes>


is well formed, valid ,and follows the Axualize XML schema. 

So I added the capability to pass a (only one for now) URL argument to the tag
handler since I had a <relative-url> Tag handler which produces a URL instance
from the text of the element or the "href" attribute.

I hope my explaination has cleared things up a little.

It is really helpful to use a poweful XML editor like XMLSpy. In order to
facilitate this I had to come up with some creative ways to deal with
dynmically created Axualize documents using JSP, PHP, XSL, etc...

--- Frank Burough <fbu...@el...> wrote:
> Russ:
> I assumed the behavior when I used the <relative-url> tag. Looks like
> the relative-url tag does nothing but add clarity? If so, I can shorten
> my files a bit by just adding my relative URL to the load-classes tag
> directly.
> 
> thanks,
> 
> Frank
> 
> On Mon, 2003-03-10 at 14:59, Russell White wrote:
> 
> > Frank,
> > 
> > I need to rewrite some of the docs to be more clear.
> > 
> > Here is something else I forgot to mention about load classes and most of
> the
> > other URL based tags in Axualize.
> > 
> > By default "href" attributes in most tags are relative.
> > 
> > So if I have an Axualize document at:
> > 
> > /home/russ/axualize/xml/hello.xml
> > 
> > and libraries here:
> > /home/russ/axualize/lib/*
> > 
> > 
> > and I execute it as follows
> > 
> > java -jar %AXUALIZE_HOME%/dist/axualize.jar
> > file:/home/russ/axualize/xml/hello.xml
> > 
> > Then I can load libraries like this:
> > <load-classes href="../lib/myLibA.jar"/>
> > <load-classes href="../lib/myLibA.jar"/>
> > 
> > I think this is why I wrote the tag handler like I did.
> > 
> > The only reason I included the URL argument support at all was to better
> > support cases where the URL was generated at document creation time time
> using
> > something like JSP.
> > 
> > WR
> > Russ
> > --- Frank Burough <fbu...@el...> wrote:
> > > Hi--
> > > 
> > > I am attempting to load classes via two different jar files, with syntax
> > > like:
> > >   <load-classes>
> > >     <relative-url href="echo.jar"/>
> > >     <relative-url href="swingutils.jar"/>
> > >   </load-classes>
> > > 
> > > 
> > > To test this I first instantiated an object from 'echo.jar' only. It
> > > works just fine.
> > > I modified the XML to instantiate only an object from 'swingutils.jar'.
> > > It crashed trying to instantiate the object.
> > > Next, I removed the line loading the echo.jar file from my XML and
> > > re-ran my application. It ran fine and instantiated an object from
> > > swingutils.jar without error.
> > > 
> > > I then reversed the order of the jar references (swingutils first then
> > > echo), and instantiated an object from
> > > swingutils. It ran fine. I added code to instantiate an object from
> > > echo.jar, and it crashed attemtpting to instantiate it. 
> > > 
> > > My conclusion is that only the classes in the first jar file are
> > > visible. Is this a known limitation or a bug? Or, am I once-again doing
> > > something foolish? At the moment, I can get by with importing only 1 jar
> > > file, but I can see where this may be a limitation in the future. 
> > > 
> > > Am I missing something?
> > > 
> > > Thanks,
> > > 
> > > Frank
> > > 
> > > 
> > > 
> > 
> > 
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