[jira] [Created] (LOG4J2-419) Support default value for missing key in look ups with fallbacking to looking in the properties map

["Woonsan Ko (JIRA)" <ji...@apache.org>]

Woonsan Ko created LOG4J2-419:
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             Summary: Support default value for missing key in look ups with fallbacking to looking in the properties map
                 Key: LOG4J2-419
                 URL: https://issues.apache.org/jira/browse/LOG4J2-419
             Project: Log4j 2
          Issue Type: Improvement
            Reporter: Woonsan Ko
            Priority: Minor


It is more useful and flexible to allow default value in the variable expression itself.
For example, ${var1:-defvalue1}, ${ctx:request_id:-defvalue2}, etc.
This generic feature has been included in StrSubstitutor of commons-lang3 as well with the following issue:
- https://issues.apache.org/jira/browse/LANG-893

The benefit from the feature with LANG-893 is we can use it more widely whenever used in look ups.



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