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https://issues.apache.org/jira/browse/VELOCITY-688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672312#action_12672312
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Byron Foster commented on VELOCITY-688:
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Well, I figure rendering $foo as a blank string when it is null is the more
natural thing to do, and the behavior that in most cases will be desired. I
Just made it so that if people really want an exception thrown when $foo is
equal to null, they could use the bang syntax ($!foo). But, this is more just
using an existing syntax mechanism more then anything else. I could just as
easily in strict mode go with the bang not doing anything at all, I don't think
it's really needed. Not sure, thoughts?
> ! 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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