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https://issues.apache.org/jira/browse/JEXL-162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623401#comment-14623401
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Dmitri Blinov commented on JEXL-162:
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You are right that JEXL documentation does not clearly state that empty()
operator will ever return *false*, but from experience with EL, in which spec
clearly defines "otherwise return false", and from behaviour of JEXL 2.1, I was
kind of expecting this behaviour. I understand your point about 'emptiness'
which must have special meaning for objects like maps and collections etc, but
in EL and JEXL we are get used to little nifty things like type coercions, so
for me personally it's not obvious why in that case we must be so strict.
And you are right, I'm getting this exception in lenient mode, which I hope
will be fixed.
And thanks for suggesting how to implement empty() for XML nodes, I'll
definitly play with it.
> empty() function throws an exception : unsupported type
> -------------------------------------------------------
>
> Key: JEXL-162
> URL: https://issues.apache.org/jira/browse/JEXL-162
> Project: Commons JEXL
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Dmitri Blinov
>
> empty() : unsupported type : class
> com.sun.org.apache.xerces.internal.dom.ElementImpl.
> Exepected behaviour - just return false if neither:
> Object is null
> Object is an empty string
> Object is an array of length zero
> Object is a collection of size zero
> Object is an empty map
> .....
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