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https://issues.apache.org/jira/browse/WICKET-7148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928157#comment-17928157
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ASF subversion and git services commented on WICKET-7148:
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Commit d718c419a99269196ad568b08861270ae7aa30f4 in wicket's branch
refs/heads/master from hosea
[ https://gitbox.apache.org/repos/asf?p=wicket.git;h=d718c419a9 ]
WICKET-7148: Make deletion of Metadata in Application possible again (#1101)
Co-authored-by: Schäfer, H.H. (Hans Hosea) <[email protected]>
> Removing Metadata from Application not possible
> -----------------------------------------------
>
> Key: WICKET-7148
> URL: https://issues.apache.org/jira/browse/WICKET-7148
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 9.12.0, 9.20.0
> Reporter: Hans Schäfer
> Priority: Minor
>
> Moving to ConcurrentHashMap as storage for the MetaData made deleting
> Metadata by passing null-Value when calling Appliction#setMetadata
> impossible. ConcurrentHashmap does not like null-Values and reacts with
> Exception.
> Solution: use ConcurrentHashMap#remove for null-Value.
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