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https://issues.apache.org/jira/browse/VELOCITY-688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672333#action_12672333
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chreck edited comment on VELOCITY-688 at 2/10/09 9:58 AM:
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The original intent of the bang syntax ($!foo) - it is to allow the template
writer to say "this may be null".
Without strict mode, $!foo will not log anything if it is undefined or null.
I have not used the strict mode, so I have not considered what to do then for a
$foo that is undefined or null. I do agree with Nathan that a $foo null
reference in strict mode should throw an exception as originally devised. A
$!foo null reference in strict mode could output nothing or throw an exception
(no preference here).
was (Author: chreck):
This is the original intent of the bang syntax - it is to allow the
template writer to say "this may be null".
Without strict mode, $!foo will not log anything if it is undefined or null.
I have not used the strict mode, so I have not considered what to do then for a
$foo that is undefined or null. I do agree with Nathan that a $foo null
reference in strict mode should throw an exception as originally devised. A
$!foo null reference in strict mode should output nothing or throw an exception
(no preference here).
> ! preceding a reference in strict mode ignores a null exception
> ---------------------------------------------------------------
>
> Key: VELOCITY-688
> URL: https://issues.apache.org/jira/browse/VELOCITY-688
> Project: Velocity
> Issue Type: Improvement
> Components: Engine
> Affects Versions: 1.7
> Reporter: Byron Foster
> Fix For: 1.7
>
>
> Change strict mode (runtime.references.strict = true) behavior such that when
> Velocity attempts to render a reference that evaluates to null then throw an
> exception. If the reference is preceded by '$!' as in $!foo, then simply
> render nothing and ignore the null value as it does for non strict mode.
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