nativeDispatch SEVERE error with apache ErrorDocument on 404 to a servlet

[Daniel Gibby]

Hey all, I just discovered some things that I googled around and 
debugged a bit and couldn't find any help on, so I'm posting it to the 
list so that when I have the problem again, I'll find my own posting via 
google! Maybe it will help someone else as well.

Using: Apache, mod_jk2 tomcat4.1.27
In apache I have ErrorDocument directives that send 404 errors to a servlet.
This was supposed to be setup so that I could forward people who make 
invalid requests to a valid page.
Also I could send errors to a log, and give people a nice looking page 
rather than apache's default.

Here's the tricky part:
I have mod_jk2 setup to forward *.jsp and certain servlets to tomcat, 
but graphics and such come through apache.
If I have a valid request come in to a jsp page or to a servlet... but 
there is a gif/png/jpg missing on that page, then strange things begin 
to happen.
Here's some output:

Normal output complete from jsp page.
Apr 7, 2004 12:53:00 PM org.apache.jk.common.JniHandler nativeDispatch
SEVERE: nativeDispatch: error 21000
Apr 7, 2004 12:53:01 PM org.apache.jk.common.ChannelUn receive
SEVERE: receive error:   21000
Apr 7, 2004 12:53:00 PM org.apache.jk.common.JniHandler nativeDispatch
SEVERE: nativeDispatch: error 21000
Apr 7, 2004 12:53:01 PM org.apache.jk.common.ChannelUn receive
SEVERE: receive error:   21000
CoyoteAdapter  Requested cookie session id is 
6480375D001AF672794CA5AEFFAAAF92
ErrorDocument servlet output. That's  bad!
Apr 7, 2004 12:53:01 PM org.apache.jk.common.JniHandler nativeDispatch
SEVERE: nativeDispatch: error -3
Apr 7, 2004 12:53:01 PM org.apache.jk.common.JniHandler nativeDispatch
SEVERE: nativeDispatch: error -3
Apr 7, 2004 12:53:01 PM org.apache.jk.common.JniHandler nativeDispatch

If you have seen errors such as these in your logs, it may be that you 
are using an apache ErrorDocument forwarding to tomcat, and really you 
just have some missing graphics or other files!

So now that I figured out what is going on... does anyone have an idea 
of how to handle this?
I really want to send just jsp and servlet type 404 errors to a servlet 
/ JSP, not missing graphic 404 errors. But there is no way to 
distinguish them on the apache side that I know of... and no way to 
distinguish them on the tomcat side either.
If you look at some of the apache docs they say that they now set some 
additional CGI variables for this purpose, but I don't think they are 
accessible from jsp.
The variables all start with REDIRECT_
ServletConfig / ServletRequest don't provide a way to get at those 
variables, right? This is kind of going off topic, but help!

Thanks,
Daniel Gibby
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