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https://issues.apache.org/jira/browse/LOG4J2-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma resolved LOG4J2-2197.
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Resolution: Invalid
All lookups, including the system properties lookup, already do support default
values. The syntax is similar to using a default for obtaining the [value of a
*nix shell variable|https://stackoverflow.com/a/2013589] and requires a hyphen
prefix:
{code:java}
${sys:key:-defaultvalue}{code}
> Default system property value support
> -------------------------------------
>
> Key: LOG4J2-2197
> URL: https://issues.apache.org/jira/browse/LOG4J2-2197
> Project: Log4j 2
> Issue Type: Bug
> Components: Lookups
> Affects Versions: 2.10.0
> Reporter: Fabrice Daugan
> Priority: Major
>
> As Spring and some other libraries, it would be nice to support default
> property value. For sample :
> {{$\{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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