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https://issues.apache.org/jira/browse/LOG4J2-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329105#comment-16329105
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ASF GitHub Bot commented on LOG4J2-2197:
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GitHub user fabdouglas opened a pull request:
https://github.com/apache/logging-log4j2/pull/142
[LOG4J2-2197] Document default property value support
Complete the documentation about the default environment and system
properties syntaxes :
Updated pages are :
- https://logging.apache.org/log4j/2.x/manual/lookups.html
- https://logging.apache.org/log4j/2.x/manual/configuration.html
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/fabdouglas/logging-log4j2 LOG4J2-2197
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/logging-log4j2/pull/142.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #142
----
commit 3198db7338ca4370665222aa368b235fd42e6f3b
Author: Fabrice Daugan <fabrice.daugan@...>
Date: 2018-01-17T17:50:11Z
[LOG4J2-2197] Document default property value support
----
> 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: 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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