RE: More helpful reporting of exceptions in JSPs

[Mark Thomas]

The 'correct' way to do this is to create an enhancement request in bugzilla and
attach your patch to it.

Mark 

 -Original Message-
 From: Tim Fennell [mailto:[EMAIL PROTECTED] 
 Sent: Sunday, October 09, 2005 10:50 PM
 To: tomcat-dev@jakarta.apache.org
 Subject: More helpful reporting of exceptions in JSPs
 
 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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More helpful reporting of exceptions in JSPs

[Tim Fennell]

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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