Phillip Webb created LOG4J2-3618:
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Summary: 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
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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