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https://issues.apache.org/jira/browse/WW-4436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486708#comment-14486708
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Lukasz Lenart commented on WW-4436:
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2.3.23 is under test, you can us help testing it :)
http://markmail.org/thread/oqtssgeesejrobko
> NullPointerException in ParametersInterceptor.isAcceptableValue
> ---------------------------------------------------------------
>
> Key: WW-4436
> URL: https://issues.apache.org/jira/browse/WW-4436
> Project: Struts 2
> Issue Type: Bug
> Components: Core Interceptors
> Affects Versions: 2.3.20
> Reporter: Mitth'raw'nuruodo
> Assignee: Lukasz Lenart
> Labels: easyfix
> Fix For: 2.3.23
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> ParametersInterceptor.isAcceptableValue (in XWork 2.3.20) fails to check
> whether array elements are null before calling toString on them, which can
> lead to NPE at line 365.
> A safer option would be to use String.valueOf instead.
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