"Duffey, Kevin" wrote:
>
> > As above, it is not forced. In fact, you as a page developer
> > have the right to
> > tell the JSP compiler to use your own base class, instead of
> > its own, if you want
> > to:
> >
> > <%@ page ... extends="com.mycompany.MyJspBaseClass" ... %>
> >
> > However, you are explicitly warned that this is likely to
> > make performance *worse*,
> > because the page compiler has to give up all the
> > optimizations built in to the base
> > class it knows about, and write extra code in the generated
> > servlet to make sure
> > your page obeys all of the rules of the spec.
>
> True, but if I wanted to make my own servlet from JSP, I could
> "theoretically" do this. I mean..if I mapped *.jsp to my own servlet and
> even if I didn't follow the spec by implementing the jsp interface, I could
> actually make .jsp go to my servlet which I could then convert to my own
> servlet class.
You certainly could. But my primary contention remains -- doing all this work
*solely* to avoid extending a base class would not improve performance, so why
bother?
> I would have to implement code that checks if a class is
> already available (time-date, size, etc checks), and use it if it exists,
> otherwise convert the jsp into a servlet. This would not conform to the
> spec, but I believe it might be possible to optimize a jsp page even more
> so. Ofcourse, handling tag-libs, jsp syntax, and so on would be a pain in
> the butt to implement just for a possible (not even guaranteed) improvement
> in speed. I am contradicting what I said before..but when I re-read what I
> wrote, I realize I wasn't exactly thinking about what I said. :)
>
If you are willing to go to all the effort to "roll your own" JSP compiler, the
world would be a better place if you put that effort into improving the performance
of one of the open source JSP implementations -- for example, it wouldn't be hard
at all to improve the code quality that Tomcat's JSP compiler (Jasper) generates.
Also, as anyone who has invented their own "template"-type language can tell you,
maintaining such a proprietary language long term can be a pretty expensive
proposition, sometimes costing more developer effort than the apps you write on top
of it! I would encourage you to think carefully before going down that road.
Craig
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
