[jira] [Commented] (LOG4J2-3470) Expressions in property values are not expanded anymore

["Jan Mosig (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-3470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17518894#comment-17518894 ] 

Jan Mosig commented on LOG4J2-3470:
-----------------------------------

The application's configuration is this:

{code}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
	<Properties>
		<Property name="thing:System" value="ABC" />
		<Property name="thing:ApplicationName" value="@project.parent.artifactId@" />
		<Property name="thing:ApplicationVersion" value="@project.version@" />
                <Property name="thing:Environment" value="${env:ENVIRONMENT}" />
                <Property name="thing:Instance" value="${env:HOSTNAME}" />
	</Properties>
	<Appenders>
		<Console name="console" target="SYSTEM_OUT">
			<ThingJsonLayout />
		</Console>
	</Appenders>
	<Loggers>
		<!-- Root logger for everything that does not belong to the service (e.g. 3rd-party libraries).  -->
		<Root level="${env:LOG_LEVEL_ROOT:-WARN}">
			<AppenderRef ref="console" />
		</Root>
		<!-- Logger for everything that belongs to the service (usually has lower log level). -->
		<Logger name="my.fancy.project" level="${env:LOG_LEVEL_SERVICE:-INFO}" additivity="false">
			<AppenderRef ref="console" />
		</Logger>
		<Logger name="my.fancy.project.springboot" level="debug" additivity="false">
			<AppenderRef ref="console" />
		</Logger>
	</Loggers>
</Configuration>
{code}

As for the configuration within the cloud I don't really know. If you also need it, I could investigate.

> Expressions in property values are not expanded anymore
> -------------------------------------------------------
>
>                 Key: LOG4J2-3470
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-3470
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.17.2
>         Environment: Running with / in:
> * Spring Boot 2.6.6
> * log4j 2.17.2
> * Docker / K8s on Amazon EKS
> * Java 11
>            Reporter: Jan Mosig
>            Priority: Major
>
> In our logging submodule we are using log4j2 properties with value expressions to do things, e. g.
> {code}
> <Property name="thing:Environment" value="${env:ENVIRONMENT}" />
> <Property name="thing:Instance" value="${env:HOSTNAME}" />
> {code}
> However, since we upgraded to 2.17.2, the expressions are not (always) expanded anymore, i. e. the log will contain {{environment:${env:ENVIRONMENT}}} rather than {{environment:my-fancy-env}}.
> The behavior is reproducible, however different applications behave differently, i. e. the same configuration yields different results (as in a race condition). The behavior is the same for the same config and application.
> Our current *workaround* is to downgrade to 2.17.1 for the time being.
> Is there maybe a connection to recently introduced raw values? Is this related to LOG4J2-3434?



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