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From "John Vasileff (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4J2-49) double message formatting w/SLF4JLogger
Date Fri, 16 Sep 2011 17:47:09 GMT
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


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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