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https://issues.apache.org/jira/browse/LOG4J2-3677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17781525#comment-17781525
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Volkan Yazici commented on LOG4J2-3677:
---------------------------------------
[~jiagao], I have copy-pasted your code, run it against {{2.21.1}}, and it
worked. I suspect your configuration might be overridden by some other source,
e.g., one provided by environment variables? (See [System
Properties|https://logging.apache.org/log4j/2.x/manual/configuration.html#system-properties]
page of the manual on ordering of configuration sources.)
*Could you provide me an example that doesn't work against {{2.21.1}}, please?*
In the class you pointed,
{{PropertiesUtil.getProperties().getStringProperty()}} is used, which performs
fuzzy matching. Hence, both {{log4j.}} and {{log4j2.}} prefixes will be used
for lookup. You can verify this yourself too:
{code:java}
Stream
.of("log4j.configurationFactory", "log4j2.configurationFactory")
.forEach(property -> System.out.format("%s=%s%n", property,
PropertiesUtil.getProperties().getStringProperty(property)));
{code}
> System property log4j2.configurationFactory doesn't work
> --------------------------------------------------------
>
> Key: LOG4J2-3677
> URL: https://issues.apache.org/jira/browse/LOG4J2-3677
> Project: Log4j 2
> Issue Type: Bug
> Reporter: Jiazhou Gao
> Assignee: Volkan Yazici
> Priority: Major
>
> We followed the wiki
> [https://logging.apache.org/log4j/2.x/manual/customconfig.html]and set
> -Dlog4j2.configurationFactory=<our customized configuration factory> in Java
> opts.
> It used to work but seems broken after log4j2 2.17.1. Our
> configurationFactory never started
> Now, we have to use system property log4j.configurationFactory and set
> -Dlog4j.configurationFactory=<our customized configuration factory> in Java
> opts
> So it looks like a regression in log4j2 latest versions
>
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