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https://issues.apache.org/jira/browse/LOG4J2-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17462999#comment-17462999
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Ralph Goers commented on LOG4J2-3258:
-------------------------------------
Looking at this
{code:java}
<Property name="logs_dir">$${env:LOGS_DIRECTORY}</Property>
{code}
doesn't seem correct to me. Environment variables can't change while a Java
application is running. So this should really be:
{code:java}
<Property name="logs_dir">${env:LOGS_DIRECTORY}</Property>
{code}
which will cause the value to be resolved when the configuration is processed.
The change made in Log4j 2.17.0 is that recursive lookups are allowed in the
configuration on anything that is not evaluated in connection with a log event.
In your case I would have expected that the fileName would continue to work
since that is only evaluated when the RollingFileManager is created. But the
filePattern is evaluated on every rollover so will no longer be allowed to have
recursive lookups.
As I expected you are using the Routing appender. While that will continue to
work you need to make sure the value of logFile cannot be derived from anything
coming from outside the application, such as user input or an http header.
> RollingFile fileName containing variables does not work on 2.17.0
> -----------------------------------------------------------------
>
> Key: LOG4J2-3258
> URL: https://issues.apache.org/jira/browse/LOG4J2-3258
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.17.0
> Environment: Java 17, Ubuntu 20.04.
> Reporter: Konstantinos Liakos
> Priority: Major
>
> A configuration like the below has stopped working since 2.17.0. The
> variables that originate from <Properties> are not resolved to their actual
> values.
> {code:xml}
> <Property name="logs_dir">$${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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