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https://issues.apache.org/jira/browse/LOG4J2-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17464649#comment-17464649
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Carter Kozak commented on LOG4J2-3258:
--------------------------------------
I've added a document with some background context as well as specific examples
here:
https://github.com/apache/logging-log4j2/blob/release-2.x/docs/2.17.0-interpolation.md
> RollingFile fileName containing variables does not work on 2.17.0
> -----------------------------------------------------------------
>
> Key: LOG4J2-3258
> URL: https://issues.apache.org/jira/browse/LOG4J2-3258
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.17.0
> Environment: Java 17, Ubuntu 20.04.
> Reporter: Konstantinos Liakos
> Priority: Major
> Attachments: log4j2-appender-routing.xml, log4j2.xml
>
>
> A configuration like the below has stopped working since 2.17.0. The
> variables that originate from <Properties> are not resolved to their actual
> values.
> {code:xml}
> <Property name="logs_dir">$${env:LOGS_DIRECTORY}</Property> {code}
> {code:xml}
> <RollingFile name="Rolling-${ctx:logFile}"
> fileName="${logs_dir}/${ctx:logFile}"{code}
>
> Works fine on 2.16.0.
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