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https://issues.apache.org/jira/browse/LOG4J2-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17464685#comment-17464685
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Michael Vorburger commented on LOG4J2-1180:
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{quote}[~garydgregory], [~ralph.go...@dslextreme.com], [~mikaelstaldal] can you
take a look at SLF4JLoggerContext? It looks like the {{getLogger(String,
MessageFactory)}} method currently ignores the MessageFactory, and when I try
to fix that in the spirit of LOG4J2-1180, the test in log4j-to-slf4j
org.a.l.slf4j.LoggerTest breaks... (getLogger_String_MessageFactoryMismatchNull
and getLogger_String_MessageFactoryMismatch) Is there something special about
SLF4J Loggers that they must be unique by name only, not by
name/MessageFactory? Or are the current implementation and the test simply
wrong - LOG4J2-1180 was not addressed correctly here?
{quote}
https://github.com/apache/logging-log4j2/pull/651/ fixes this FYI.
> Logger cache does not account for message factory
> -------------------------------------------------
>
> Key: LOG4J2-1180
> URL: https://issues.apache.org/jira/browse/LOG4J2-1180
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.4.1
> Reporter: Gary D. Gregory
> Assignee: Gary D. Gregory
> Priority: Major
> Fix For: 2.5, 2.6.1
>
> Attachments: LOG4J2-1180-ggregory.patch, LOG4J2-1180.diff
>
>
> The Logger cache does not account for a logger's message factory.
> If you call {{LogManager.getLogger(Class|Object|String, MessageFactory)}} and
> then call a getLogger() API again with the same {{Class|Object|String}} a
> different message factory, you get the Logger that was first created which
> means you will not get the proper formatted messages.
> For example:
> {code:java}
> Logger loggerA1 = LogManager.getLogger("A", messageFactory1);
> Logger loggerA2 = LogManager.getLogger("A", messageFactory2);
> {code}
> loggerA1 is the same as loggerA2.
> This is a problem if two unrelated code bases (jars) both the same Logger
> names|objects|classes.
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