Re: Global default expression/variable value policy

Thank you very much. This is exactly that I have been looking for. Global
default variables is obviously nonsense when there is possibility to handle
processing errors by this way. I need only to make FreeMarker continue
rendering even in case of such error in production (of course with loging
appropriate error). Thank you again.

Cheers, Jan
Dne 21.1.2011 8:30 "Daniel Dekany" <[email protected]> napsal(a):
> There's no setting that magically changes undefined variables to ""
> (or who knows what the sensible default would be... maybe 0, or []
> etc., depending on the place). Although you could do such a trick at
> certain places with a special ObjectWrapper, that would change the
> behavior of your templates where exp!default is used.
>
> The closest thing to what you want is this:
> http://freemarker.org/docs/pgui_config_errorhandling.html#autoid_44
>
> Here, instead of substituting an undefined variable, you can
> substitute a whole failing ${...} or <@.../> <@...>...</@...> or
> <#...> or <#...>...</#...>.
>
> In your case, you want to examine if the error is instanceof
> freemarker.core.InvalidReferenceException, and only suppress the
> exception then. In such case you could also issue some kind of special
> log entry so these issues can be fixed by the maintainers.
>
>
> Thursday, January 20, 2011, 9:40:10 AM, Ing. Jan Novotný wrote:
>
>> Hello,
>>
>> I wonder whether there is a way how to set a default variable
>> policy globally in FreeMarker. Consider these cases, when myVar has null
value:
>>
>> 1. ${myVar!""} <#-- prints empty string -->
>> 2. ${myVar} <#-- throws exception -->
>>
>> This NULL treatment is very good for development and test
>> environments, but for production I'd like the second example to not
>> throw exception but instead print some default value (such as empty
>> string). My experience is that developers (webdesigners in my case)
>> despite all the testing efforts often "forget" to define default
>> values even for non mandatory things. This finally leads to errors
>> in production that could be many times avoided if I have chance to
>> set a strategy how to behave when retrieving variable value fails due to
not specified default.
>>
>> Is there any extension point how can I plug in some custom logic for this
use case?
>>
>> Thanks for any advices,
>> Jan
>
> --
> Best regards,
> Daniel Dekany
>

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