double message formatting w/SLF4JLogger
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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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