Re: [Springframework-developer] HandlerExceptionResolver not catching taglib exceptions?

[Juergen H. <ju...@in...>]

Well, a HandlerExceptionResolver is just expected to resolve exceptions
thrown by the actual handlers: that is, the Controllers or other handler
objects executed by a HandlerAdapter. The main reason for this is that a
HandlerExceptionResolver assumes to be able to redirect to a ModelAndView,
which is only cleanly possible as long as view rendering hasn't started yet.

If an exception is raised during view rendering, parts of the view are
likely to already have been sent to the client, so redirecting to an error
view is not possible anymore. If you nevertheless want to handle such
exceptions, for example for logging, consider implementing a standard
Servlet Filter for this, which will catch exceptions thrown during view
rendering as well.

Juergen
 

-----Original Message-----
From: spr...@li...
[mailto:spr...@li...] On Behalf Of
Tim Kettering
Sent: Tuesday, November 15, 2005 9:32 PM
To: spr...@li...
Subject: [Springframework-developer] HandlerExceptionResolver not catching
taglib exceptions?


I'm doing some work with the spring-portlet MVC in our current project, and
one thing I ran across recently is that apparently the
HandlerExceptionResolver on the portlet side does not catch Exceptions
thrown from a taglib (a custom taglib for example).  I've tested this out by
issuing the same exception from inside the handler itself, which was caught
as expected, but throwing that exception from a taglib itself is not caught.

So it seems that the HandlerExceptionResolver does not handle exceptions
that are issued after the flow of control is handed over to the view phase.

I e-mailed John Lewis about this, and he said he thinks this is how it also
performs on the servlet-MVC side as well.  Since we do not have any
servlet-MVC code here, I thought I'd ask on the list to see if this is
indeed true as well.

If so, what would be the correct way to handle exceptions issued by taglibs,
using spring MVC?  

Thanks!

-tim



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