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https://issues.apache.org/jira/browse/LOG4J2-3345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17503589#comment-17503589
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Markus Spann commented on LOG4J2-3345:
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[~ckozak], this is a breaking change for applications developed against System
Logger and expecting the curly braces pattern without indices.
> log4j-jpl must handle parameters as MessageFormat args
> ------------------------------------------------------
>
> Key: LOG4J2-3345
> URL: https://issues.apache.org/jira/browse/LOG4J2-3345
> Project: Log4j 2
> Issue Type: Bug
> Components: JPL Adapter
> Affects Versions: 2.17.1
> Reporter: Carter Kozak
> Assignee: Carter Kozak
> Priority: Major
> Fix For: 2.17.2
>
>
> Currently message parameters use the configured default messagefactory, which
> provides no guarantees around the format used, however JPL API requires
> MessageFormat style formatting.
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