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https://issues.apache.org/jira/browse/LOG4J2-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15066595#comment-15066595
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Olivier Lemasle commented on LOG4J2-1227:
-----------------------------------------
This is due to commit a2fb4c2be716568.
> NullPointerException in MapLookup.lookup is the event is null
> -------------------------------------------------------------
>
> Key: LOG4J2-1227
> URL: https://issues.apache.org/jira/browse/LOG4J2-1227
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.4, 2.4.1, 2.5
> Reporter: Olivier Lemasle
> Fix For: 2.5.1
>
>
> A NullPointerException is thrown in
> org.apache.logging.log4j.core.lookup.MapLookup.lookup, when the event is null
> and the map is not null.
> The event can indeed be null, for example if used from StrSubstitutor, with
> the method replace(final StringBuilder source).
> Exception:
> java.lang.NullPointerException: null
> at
> org.apache.logging.log4j.core.lookup.MapLookup.lookup(MapLookup.java:121)
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