Oliver Flege created LOG4J2-418:
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Summary: Support default value for missing key in map-based pattern
Key: LOG4J2-418
URL: https://issues.apache.org/jira/browse/LOG4J2-418
Project: Log4j 2
Issue Type: Improvement
Reporter: Oliver Flege
Priority: Minor
%X{key} and %K{key} render the value found for key in the thread context map or
MapMessage, respectively. If the key is not contained in the map, the pattern
evaluates to "" (empty string).
A default value for missing values can currently only be defined by using
$${ctx:key} and defining a property named "key" with the desired default value.
Drawbacks: ${ctx:key} has to be parsed and evaluated for each message and the
pattern does not support conversion specifiers (for alignment, fixed width,
etc).
The proposed improvement would be to support an optional default value that can
be specified in the pattern, e.g. %X{key:-defaultValue}
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