Apologies in advance for cross-posting this, but I sent this email
out to the tomcat-dev list a couple of days ago and have received no
replies at all... I think this is quite a useful feature, and I'm
wondering how best to go about contributing it.
Thanks

-Tim Fennell
http://stripes.mc4j.org

Begin forwarded message:

> From: Tim Fennell <tfenne@(protected)>
> Date: October 9, 2005 5:50:11 PM EDT
> To: tomcat-dev@(protected)
> Subject: More helpful reporting of exceptions in JSPs
> Reply-To: "Tomcat Developers List" <tomcat-dev@(protected)>
>
>
> Hi,
>
> I'll apologize in advance if this is the wrong place to post this,
> or if this has been covered before. I had a good read through the
> Tomcat docs and faqs, searched the bug database, and googled around
> on the topic, but could not really find anything.
>
> I've been using Tomcat for a while, and in general have found it as
> good a servlet/JSP container as any I've used. With one exception
> (no pun intended). A long time ago I started out using WebLogic,
> and the one thing that I loved about WebLogic, that is missing from
> Tomcat, is that when an Exception occurred in a JSP it would tell
> you what line number *in the JSP* generated the exception, and show
> you a snippet of code around the offending line.
>
> For quite a while I'd figured that the way Tomcat was built
> prevented this from being easy/possible, but I didn't look. Well,
> I finally got around to looking, and it only took me a couple of
> hours to implement it. Which makes me wonder if there is some
> other reason that this isn't done in Tomcat/Jasper?
>
> At any rate, I have code that will do this now, and I think it'd be
> a great productivity boost for anyone else developing JSPs on
> Tomcat. It amounts to small patches to two files. The first is
> org.apache.jasper.compiler.Compiler to make it hang on to the parse
> tree (pageNodes) if in development mode, and a getter to make this
> accessible. The second is to
> org.apache.jasper.servlet.JspServletWrapper to do the grunt work of
> mapping a stack frame from the exception back to the line in the
> JSP that it came from.
>
> It's all coded up to function only when in development mode, and is
> reasonably well commented. Would any of the committers be
> interested in taking a look at this if I put together a patch and
> posted it here? Cheers,
>
> -Tim Fennell
> http://stripes.mc4j.org
>
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