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https://issues.apache.org/jira/browse/WW-4831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108944#comment-16108944
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ASF subversion and git services commented on WW-4831:
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Commit 60d61fac0abb5993977e84f8dcc5bea6588f41d6 in struts's branch
refs/heads/master from thrawnca
[ https://git-wip-us.apache.org/repos/asf?p=struts.git;h=60d61fa ]
[WW-4831] add unit tests for conversion of String arrays
> Array-of-null parameters are converted to arrays containing "null"
> ------------------------------------------------------------------
>
> Key: WW-4831
> URL: https://issues.apache.org/jira/browse/WW-4831
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.5.12
> Reporter: Mitth'raw'nuruodo
> Fix For: 2.5.13
>
>
> The {{com.opensymphony.xwork2.conversion.impl.StringConverter}} class, since
> Struts 2.5.11, 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 the String "null".
> This is a similar issue to WW-4737, but occurring in different code.
> Please ensure that conversion to String always uses the two-argument version
> of {{Objects.toString}}, which preserves nulls, rather than
> {{String.valueOf}}, which converts them to the four-letter string "null".
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