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https://issues.apache.org/jira/browse/LOG4J2-1885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15980489#comment-15980489
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Matt Sicker commented on LOG4J2-1885:
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The only reason you'd get duplicate logging without overriding additivity is
when you specify appender-ref on multiple loggers. The default value is true,
though, so good catch.
> documentation error regarding additivity default value
> ------------------------------------------------------
>
> Key: LOG4J2-1885
> URL: https://issues.apache.org/jira/browse/LOG4J2-1885
> Project: Log4j 2
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 2.8.2
> Reporter: Hal Deadman
> Labels: documentation
>
> On this page: https://logging.apache.org/log4j/2.x/manual/configuration.html
> There is the following sentence:
> "The additivity attribute may be assigned a value of true or false. If the
> attribute is omitted the default value of false will be used."
> Additivity controls the inheritance of appenders from parent loggers,
> correct? There are examples in the documentation that say will you will get
> duplicate logging if you don't set additivity to false (if you are setting
> the same appender at the root and on the logger). That implies that the
> default additivity is true, which would be consistent with logback, log4j,
> etc.
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