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https://issues.apache.org/jira/browse/LOG4J2-3618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Karwasz resolved LOG4J2-3618.
-----------------------------------
Resolution: Fixed
A fix is available in the current 2.24.0 snapshot.
> Multiple PropertySources with identical priority cannot be added to
> PropertiesUtil Environment
> ----------------------------------------------------------------------------------------------
>
> Key: LOG4J2-3618
> URL: https://issues.apache.org/jira/browse/LOG4J2-3618
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.17.2
> Reporter: Phillip Webb
> Priority: Minor
> Fix For: 2.24.0
>
>
> The {{org.apache.logging.log4j.util.PropertiesUtil.Environment}} maintains a
> set of {{sources}} by using a {{ConcurrentSkipListSet}} backed with a
> {{PropertySource.Comparator}}.
> Somewhat surprisingly, the {{ConcurrentSkipListSet}} will not add an item if
> comparing it to an existing one returns {{0}}. This means that all
> {{PropertySource}} implementations must have unique {{getPriority()}}
> results. I think this might be better to use a {{Set}} that uses
> {{equals/hashCode}} to determine if items can be added and only use the
> {{Comparator}} for sorting.
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