Solution to integrating error-page with struts2

[Fred Toth <ft...@synernet.com>]

Hi all,

I had problems trying to get tomcat to forward to a struts2 action
from an <error-page> directive in web.xml. I was all set to run to
the list for help when I figured it out. I thought I'd post this anyway
in case it helps someone else.

I had error-page working in the simplest sense. If I pointed it toward
a plain HTML file, it worked fine. But if I tried going to a struts action,
I got strange behavior and the action never fired.

Then I read in the servlet spec that error-page forwarding doesn't go 
through
filters unless you use the <dispatcher> mechanism. And, sure enough,
struts2 is implemented as a filter. Once I added:

<dispatcher>REQUEST</dispatcher>
<dispatcher>ERROR</dispatcher>

to the struts filter-mapping, everything worked.

The problem I was trying to solve: I'm using DefaultServlet to serve lots
of resources on my site. However, I needed a general purpose "not found"
handling mechanism. So if we forward a request to DefaultServlet for
a resource that doesn't exist, I want to trap that in my struts 2 "not 
found"
action.

Thanks.

Fred

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