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https://issues.apache.org/jira/browse/LOG4J2-49?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13107360#comment-13107360
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Ralph Goers commented on LOG4J2-49:
-----------------------------------
I should also point out that rather than using SLF4J's jcl-over-slf4j using
log4j2-jcl would be more appropriate if the underlying implementation is Log4j
2.0.
> double message formatting w/SLF4JLogger
> ---------------------------------------
>
> Key: LOG4J2-49
> URL: https://issues.apache.org/jira/browse/LOG4J2-49
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Reporter: John Vasileff
> Assignee: Ralph Goers
>
> SLF4JLogger implements LocationAwareLogger which has
> public void log(Marker marker, String fqcn, int level, String message,
> Object[] argArray, Throwable t);
> Callers of this method format the message in advance. But SLF4JLogger also
> performs formatting.
> Example:
> slf4jLogger.info("slf4jLogger {}", "is formated twice? <{}>"); // works
> slf4jXlogger.info("slf4jXLogger {}", "is formated twice? <{}>"); // fails
> log4j2Logger.info("log4j2Logger shouldn't format <{}>"); // works
> jclOverSlf4jLogger.info("jclOverSlf4jLogger shouldn't format <{}>"); // fails
> Output:
> INFO Log4j2Testing [main] slf4jLogger is formated twice? <{}>
> INFO Log4j2Testing [main] slf4jXLogger is formated twice? <[[is formated
> twice? <{}>], null]>
> INFO Log4j2Testing [main] log4j2Logger shouldn't format <{}>
> INFO Log4j2Testing [main] jclOverSlf4jLogger shouldn't format <[null, null]>
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