[Seaside] Catching exceptions

[Joachim Tuchel]

Hi Karsten,

in the meantime, I found the reason, and it is as I suspected:

Some places in VA Smalltalk still use instance based exceptions and 
these will not be caught and therefor not be forwarded to a 
WAExceptionHandler.
In VA Smalltalk Object>>#error: signals an instance based exception. So 
if somewhere in a callback method you use error:, you fire an exception 
that doesn't get caught by the Seaside machinery.

Instantiations discourages the use of instance based exceptions and is 
removing them from VAST step by step, but it's not done yet. And they 
cannot force users to change their code immediately, so I need to find a 
way to extend Seaside to catch instance based exveptions as well as 
class based ones.

Does anyone have a quick pointer where to look? I'll dive right into the 
browsers now and look myself... ;-)

Joachim



Am 07.01.13 13:49, schrieb Karsten Kusche:
>
> It could also be that the exception is raise when the exception 
> handler is not in place. The handler is added through a filter and if 
> the exception happens before or after that filter is applied, you see 
> the debugger.
>
> Kind Regards
> Karsten
>
>
>
> -- 
> Karsten Kusche - Dipl. Inf. - karsten at heeg.de
> Georg Heeg eK - Köthen
> Handelsregister: Amtsgericht Dortmund A 12812
>
> Am Montag, 7. Januar 2013 um 13:43 schrieb Joachim Tuchel:
>
>> Hi Norbert,
>>
>> thanks for answering.
>>
>> In fact, what you describe is what WAApplication>>#exceptionHandler: 
>> does:
>>
>> exceptionHandler: anExceptionHandlerClass
>> | theFilter |
>> theFilter := self filters
>> detect: [ :ea | ea isExceptionFilter ]
>> ifNone: [ self addFilter: WAExceptionFilter new ].
>>
>> theFilter configuration at: #exceptionHandler put: 
>> anExceptionHandlerClass
>>
>> So, yes, I did ;-)
>>
>> I have another suspicion: VA Smalltalk has once had (and still supports
>> it) an instance based exception system, and maybe the exceptions that do
>> not get caught are such exception based ones... I'll investigate this a
>> little further and let you know what I find out.
>>
>> Joachim
>>
>>
>> Am 07.01.13 12:15, schrieb Norbert Hartl:
>>> Hi Joachim,
>>>
>>> Am 07.01.2013 um 10:22 schrieb jtuchel <jtuchel at objektfabrik.de 
>>> <mailto:jtuchel at objektfabrik.de>>:
>>>
>>>> Hi,
>>>>
>>>> I have registered a subclass of WAHtmlErrorHandler with my 
>>>> Application using
>>>>
>>>> myApp := WAAdmin register:..asApplicationAt:....
>>>> myApp exceptionHandler: MyExceptionHandlerClass.
>>>>
>>>> And it does show its error page sometimes, but often an Exception 
>>>> thrown in
>>>> an ActionCallback simply pops up a debugger in the development 
>>>> image and
>>>> silently exits a runtime image.
>>>>
>>>> You can sure imagine that this is not my intended behaviour.
>>>>
>>>> In the walkback I can clearly see that an exception gets thrown and 
>>>> handled
>>>> as usual, My HTML exception handler is never sent a message to.
>>>>
>>>> Any ideas?
>>>>
>>>> I am using Seaside 3.06 on VA Smalltalk 8.5.2.
>>> did you add an WAExceptionFilter (myApp addFilter: WAExceptionFilter 
>>> new)? This class prevents exceptions to be unhandled. The exception 
>>> filter is configurable for the kind of exception handling you want. 
>>> It can be walkback handler, email handler, …
>>>
>>> Norbert
>>>
>>> _______________________________________________
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>>> seaside at lists.squeakfoundation.org 
>>> <mailto:seaside at lists.squeakfoundation.org>
>>> http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
>>
>> -- 
>> -- 
>> 
----------------------------------------------------------------------- 
>> 
Objektfabrik Joachim Tuchel mailto:jtuchel at objektfabrik.de 
>> 
Fliederweg 1 http://www.objektfabrik.de
>> D-71640 Ludwigsburg http://joachimtuchel.wordpress.com
>> Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1
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>>
>> Anhänge:
>> - smime.p7s
>
>
>
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-- 
-- 
----------------------------------------------------------------------- 
Objektfabrik Joachim Tuchel          mailto:jtuchel at objektfabrik.de 
Fliederweg 1                         http://www.objektfabrik.de
D-71640 Ludwigsburg 		     http://joachimtuchel.wordpress.com
Telefon: +49 7141 56 10 86 0         Fax: +49 7141 56 10 86 1


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