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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]> -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: log4j-dev-unsubscr...@logging.apache.org For additional commands, e-mail: log4j-dev-h...@logging.apache.org