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https://issues.apache.org/jira/browse/WW-4651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352574#comment-15352574
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Christoph Lenggenhager commented on WW-4651:
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Okay. I created https://github.com/jkuhnert/ognl/issues/28
> Negative number is considered an arithmetic expression
> ------------------------------------------------------
>
> Key: WW-4651
> URL: https://issues.apache.org/jira/browse/WW-4651
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 2.3.29
> Reporter: Christoph Lenggenhager
> Fix For: 2.3.30, 2.5.2
>
>
> With the arithmetic expression check that has been introduced with 2.3.29,
> negative numbers are considered to be arithmetic expressions.
> This makes it impossible to use number fields with negative values as
> KeyProperty in collection type conversion.
> I can understand that one does not want to have arithmetic expressions in
> parameter names. OTOH, I would not consider a negative number as an
> arithmetic expression.
> Please let me know if I should rather open this issue in the ognl project.
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