Hi All,
I am struggling with XML / XSL transformation in the server. The scenario in
which the transformation needs to take place is as follows:
Model 2 web architecture - controller servlet forwards requests to main JSPs
which in turn <jsp:include> mini JSPs. All pages generate XML.
Transformation is to be used for separting L&F from data.
Here is what I have tried so far:
1. Mapping *.jsp to a servlet that gets the NamedDispatcher to JspServlet
and does include() with current request and a local response object which
implements HttpServletRsponse.
- this failed as the container (Tomcat) complained with ClassCastException
on the response object. It expected to find HttpServletResponseFacade or
something like that, which make sense because I was trying to cheat it into
thinking that this is the actual request that it had created.
- what I was trying to do here is to compensate for lack of servlet chaining
or piping as referred to at http://java.apache.org/cocoon/dynamic.html .
2.Creating a custom BodyTag that would embrace the whole main JSP and do the
transformation in it.
- it also failed as the custom tag cannot contain <jsp:include> which we use
to include the mini JSPs (this is somewhat explained at
http://archives.java.sun.com/cgi-bin/wa?A2=ind0008&L=jsp-interest&P=R45529
and also in the JSP spec)
3. (Have not tried this yet but something tells me it is not going to work)
Extend the container specific JspServlet and override service() and pass a
local HttpServletResponse object (similar to 1), it could work provided that
internally JspServlet does not forward() or include(), otherwise we have (1)
again.
So where does this put me? Well I have architected something that cannot be
implemented!!! It all made sense - we were using IE to do the preliminary
work with prototyping it and the transformation was done in the browser.
Does it mean we have to change the design or wait for Netscape to support
XML? This problem touches on the limitations of the Servlet API.
And of course I might be missing something really important here.
Thanks for all the input
Tomasz
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