tor, 16,.06.2005 kl. 09.48 +0100, skrev Daniel M Garland:
> Hi all,
>
> I'm a beginner with the Tapestry framework, but I've read a lot of
> tutorials and Mr. Lewis Ship's book. One thing that I didn't
> read/understand much about was an effective way of dealing with Tapestry
> exceptions.
>
> For instance I am creating a Tapestry page that creates a property from
> a database, which is used by a number of Image components to obtain the
> asset name. Whenever this property is inadvertently null, this would of
> course cause a runtime exception because the Image component would not
> know what to render.
>
> However, in a production environment, I would never want a user to see
> the Tapestry exception page; I would prefer the image component to do
> nothing. Up to now, my strategy has been to ensure that the getAsset()
> method never returns null by wrapping it up in another method, testing
> for nulls and then returning a default image .
>
> I'm sure there are some best practices out there on ensuring that I can
> prevent the exception screen reaching users in a production environment-
> can I catch Tapestry runtime errors and have the message channeled into
> a Insert component or even an email?
>
> TIA
> Cheers
> Dan Garland
>
I have made a class that rethrows exceptions on a list, so that I can
pass some exceptions on to some servlet filters.
I overrode the activateErrorPage in BaseEngine:
protected void activateExceptionPage(IRequestCycle iRequestCycle,
ResponseOutputStream responseOutputStream, Throwable throwable)
throws ServletException {
ExceptionRethrower exceptionRethrower = (ExceptionRethrower)
getBean("exceptionRethrower");
exceptionRethrower.checkForRethrow(throwable);
super.activateExceptionPage(iRequestCycle, responseOutputStream,
throwable);
}
In this method you could do whatever you want, but if you call the super
method, the exception page will appear.
For this to work you would have to make a subclass of BaseEngine.
What about detecting whether the asset is null, and make an empty asset.
I thik this would trigger the alt part of the Image comp.
HTH
--
Olve Hansen
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