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https://issues.apache.org/jira/browse/LOG4J2-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329431#comment-16329431
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ASF subversion and git services commented on LOG4J2-2197:
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Commit 904e58b266a673de2103000d8b7f021155661d65 in logging-log4j2's branch
refs/heads/master from [~garydgregory]
[ https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=904e58b ]
[LOG4J2-2197] Document default property value support. Applying patch
with small changes for grammar.
> Document default property value support
> ---------------------------------------
>
> Key: LOG4J2-2197
> URL: https://issues.apache.org/jira/browse/LOG4J2-2197
> Project: Log4j 2
> Issue Type: Bug
> Components: Lookups
> Affects Versions: 2.10.0
> Reporter: Fabrice Daugan
> Priority: Minor
> Labels: Documentation
>
> As Spring and some other libraries, it would be nice to support default
> property value. For sample :
> {{$\{sys:property_name:default_value}}}
> Lookup will return the actual system property value of "property_name" if
> defined, otherwise "default_value".
> The form without default value would work as normal and return a "null" value
> when this property is not defined.
> The way of getting the default value will be similar to
> "ResourceBundleLookup" and both "EnvironmentLookup" and
> "SystemPropertiesLookup" will benefit this feature.
> Patch incoming...
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