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https://issues.apache.org/jira/browse/WICKET-7148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928153#comment-17928153
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ASF GitHub Bot commented on WICKET-7148:
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bitstorm merged PR #1101:
URL: https://github.com/apache/wicket/pull/1101
> 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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