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https://issues.apache.org/jira/browse/WW-4848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156607#comment-16156607
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Lukasz Lenart commented on WW-4848:
-----------------------------------
It's an expression so OGNL evaluates the expression and then it tries convert
it to desire type - that's why it works but I assume it should return {{false}}
(0 means false)
> The if test can accidently incorrectly assign a new value to an object
> ----------------------------------------------------------------------
>
> Key: WW-4848
> URL: https://issues.apache.org/jira/browse/WW-4848
> Project: Struts 2
> Issue Type: Bug
> Reporter: Alan Comeau
> Priority: Minor
> Fix For: 2.5.14
>
>
> The {{s:if}} tag has the side effect of assigning to an existing object
> if the comparison is badly formed using {{=}} instead of {{==}}
> {code:html}
> <s:if test="user.id = 0">
> //at this point the user.id is now 0 not its original value
> </s:if>
> {code}
> even though this is clearly badly formed, the test should not assign anything
> to the object
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