You can implement onException() to catch exceptions thrown from page
event handlers (see
http://tapestry.apache.org/tapestry5.1/guide/event.html), or, though I
know you don't like this, for handling known exceptions in a more
generic manner you could use Tynamo's tapestry-exceptionpage module
(http://tynamo.org/tapestry-exceptionpage+guide) - the module handles
ajax requests as well.

Kalle


On Tue, Jul 20, 2010 at 8:32 PM, Paul Stanton <p...@mapshed.com.au> wrote:
> We have an ajax intensive project for which we need to better handle
> problems such as session timeouts.
>
> Most of our ajax event handlers will return a MultizoneUpdate, and currently
> will run into a NullPointerException if the session has timed out.
>
> Instead what I'd like these listeners to do is either forward to an error
> page (ie session timed out page) or attempt to reload the current page.
>
> I'd also prefer to not have to implement this for every listener, but
> utilise 'onActivate' so that I don't need to copy and paste code into every
> event listener.
>
> Does anyone have any tips for achieving this?
>
> p.
>
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