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https://issues.apache.org/jira/browse/LOG4J2-3413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17498401#comment-17498401
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Piotr P. Karwasz commented on LOG4J2-3413:
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I submitted [PR #774|https://github.com/apache/logging-log4j2/pull/774], which
should solve the problem of properties without a {{log4j}},
{{org.apache.logging.log4j}} prefix being picked up by Log4j.
> Log4j2 Incorrectly Uses System Property For Level Setting And Got
> IllegalArgumentException
> ------------------------------------------------------------------------------------------
>
> Key: LOG4J2-3413
> URL: https://issues.apache.org/jira/browse/LOG4J2-3413
> Project: Log4j 2
> Issue Type: Bug
> Components: Configuration
> Affects Versions: 2.17.1
> Environment: IBM WAS 9, JAVA 8
> Reporter: Sean Wang
> Priority: Major
> Attachments: Log4j2IssueLogs.txt
>
>
> We have an environment parameter in IBM WAS 9 running JAVA 8 with a name of
> "level" and a value of "DEVL". This parameter is used by applications to
> detect the environment they are on and worked fine with log4j2.8.2.
> After upgraded to Log4j2.17.1, for some reason the Log4j2 grabs that
> parameter during the initialization, ignoring the settings in the log4j2.xml,
> and spills a _java.lang.IllegalArgumentException: Unknown level constant
> [DEVL]_ in the system log.
>
>
>
>
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