Hans Schäfer created WICKET-7148:
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Summary: 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
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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