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https://issues.apache.org/jira/browse/WW-4848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16154857#comment-16154857
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Lukasz Lenart commented on WW-4848:
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It's rather unsolvable as this is a proper expression which returns a positive
result. Read this
https://stackoverflow.com/questions/2393988/getting-confused-with-and-in-if-statement
> 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.x
>
>
> 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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