Andrei Ivanov created LOG4J2-1317:
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Summary: Add ability for lookups to use defaults for other values
than null
Key: LOG4J2-1317
URL: https://issues.apache.org/jira/browse/LOG4J2-1317
Project: Log4j 2
Issue Type: Improvement
Components: Lookups
Affects Versions: 2.5
Reporter: Andrei Ivanov
Trying to create a configuration using the ${web:contextPath} lookup worked
fine, until I tried to use that with an empty contextPath.
It is the case when the app is deployed as the root of the
virtual host, case when the contextPath is an empty string (not null).
The Interpolator is only checking for null. Likewise, StrSubstitutor will only
use the default value if the lookup returns null, not an empty string.
Not sure if it should be configurable somehow, maybe allow some sort of
expression to express which value should trigger the use of the default value
or just the empty string.
Maybe an empty string has an actual usage in some cases.
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