[LOG4J2-49] double message formatting w/SLF4JLogger

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Component/s: API
• Assignee: Ralph Goers
• Reporter: John Vasileff
• Created: 16/Sep/11 17:46
• Updated: 11/Jul/12 20:13
• Resolved: 18/Sep/11 03:27

Description

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]>