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https://issues.apache.org/jira/browse/WW-4737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart resolved WW-4737.
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Resolution: Fixed
PR merged, thanks a lot!
> Array-of-null parameters are converted to arrays containing "null"
> ------------------------------------------------------------------
>
> Key: WW-4737
> URL: https://issues.apache.org/jira/browse/WW-4737
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.5.5, 2.5.8
> Reporter: Mitth'raw'nuruodo
> Fix For: 2.5.next
>
>
> The {{org.apache.struts2.dispatcher.Parameter.Request}} class (added in
> Struts 2.5.3) incorrectly handles arrays containing null; it converts them to
> arrays containing the string "null" (using {{String.valueOf}}).
> This is breaking one of our applications; some pages are OK, but on other
> pages, every non-provided field is populated with "null".
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