Hi Martin,
What Chris is actually looking for is custom servlet specific error handling in
addition to web application error handling (the later is what you have
described below).
In other words, 401 for Servlet X is directed to a different JSP than 401 for
the entire web application.
Regards,
Justin Randall
Sent from my BlackBerry device
-----Original Message-----
From: Martin Gainty <mgai...@hotmail.com>
Date: Wed, 13 Apr 2011 21:47:51
To: Tomcat Users List<users@tomcat.apache.org>
Reply-To: "Tomcat Users List" <users@tomcat.apache.org>
Subject: RE: [OT] servlet-specific error pages
in web.xml for your webapp
map a custom jsp for each returned HTTP status code e.g:
<error-page>
<error-code>401</error-code>
<location>/401.jsp</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/403.jsp</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/404.jsp</location>
</error-page>
Martin
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> From: ran...@hotmail.com
> To: users@tomcat.apache.org
> Subject: RE: [OT] servlet-specific error pages
> Date: Wed, 13 Apr 2011 20:10:48 -0400
>
>
> Hi Chris,
>
> > Of course. I was wondering about other exceptions or errors that maybe I
> > cannot control from that code.
>
> Are you referring to internal exceptions within Tomcat's own code or simply
> unexpected exceptions within the servlet's implemented code? If it's the
> later you could always just wrap your code with a try block that catches
> "Throwable" which will catch any possible exception thrown by Java and
> properly implemented library exceptions. Perhaps not ideal but considering
> the available options it might not be too bad.
>
> Technically speaking, catching Throwable isn't such a bad practice for
> end-user facing applications because you can at least redirect to a more
> elegant "Unexpected Exception has occurred" page rather than an error page
> showing a stack trace of a NullPointerException or some other unexpected
> errors due to programming mistakes as an example.
>
> Regards,
>
> Justin Randall
>
> > Date: Wed, 13 Apr 2011 16:11:09 -0400
> > From: ch...@christopherschultz.net
> > To: users@tomcat.apache.org
> > Subject: Re: [OT] servlet-specific error pages
> >
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Justin,
> >
> > On 4/13/2011 9:17 AM, Justin Randall wrote:
> > > Hi Chris,
> > >
> > > I'm assuming the servlet is in control of generating all of the
> > > errors you are implying?
> >
> > Yes and no:
> >
> > > For example, if the servlet doesn't load properly and a 404 would be
> > > generated, the servlet would obviously not be in control of handling
> > > this exception and this would would have to make use of <error-page>
> > > directives in web.xml, specifically for <error-code> 404 which would
> > > redirect to a JSP that just so happens to be an XML file.
> >
> > Right, but I want the default 404 error page to be in HTML.
> >
> > Basically, I want two defaults.
> >
> > If the servlet spec allowed for <error-page> to include a <servlet-name>
> > filter, that's what I would use. But it doesn't :(
> >
> > > If I've understood what you're looking for correctly I've worked on
> > > similar projects in the past and what's worked well for me is
> > > leveraging MVC by using the RequestDispatcher to forward to relevant
> > > JSPs which happen to all be XML files with the contents populated
> > > either via JSP tags or EL. This way you can catch the
> > > exceptions/error conditions in your servlet, set the appropriate
> > > exception information within the request context and the dispatch to
> > > the correct JSP XML page.
> >
> > Of course. I was wondering about other exceptions or errors that maybe I
> > cannot control from that code.
> >
> > Thanks,
> > - -chris
> > -----BEGIN PGP SIGNATURE-----
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> > =j2iW
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