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https://issues.apache.org/jira/browse/LOG4J2-1645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15596433#comment-15596433
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Gary Gregory commented on LOG4J2-1645:
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I'm not fond of the name "frozen" in places like {{EmptyFrozenStringMap}}. The
term "Immutable" is better IMO. Note that the JRE uses "Unmodifiable" in
{{java.util.Collections}} inner classes and methods.
> Immutable empty StringMap
> -------------------------
>
> Key: LOG4J2-1645
> URL: https://issues.apache.org/jira/browse/LOG4J2-1645
> Project: Log4j 2
> Issue Type: Improvement
> Affects Versions: 2.7
> Reporter: Mikael Ståldal
> Assignee: Mikael Ståldal
> Priority: Minor
>
> It would be useful for implementors of {{ContextDataInjector}} to have an
> immutable empty implementation of {{StringMap}}.
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