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https://issues.apache.org/jira/browse/WICKET-7148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrea Del Bene resolved WICKET-7148.
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Resolution: Fixed
> 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
> Fix For: 10.5.0, 9.21.0
>
>
> 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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