SLF4J

Recipes related to Simple Logging Facade for Java (SLF4J).

Composite Recipes

Recipes that include further recipes, often including the individual recipes below.

• Migrate Apache Commons Logging 1.x to SLF4J 1.x
• Migrate JBoss Logging to SLF4J
• Migrate JUL to SLF4J
• Migrate Log4j 1.x MDC to SLF4J MDC
• Migrate Log4j 1.x to SLF4J 1.x
• Migrate Log4j 2.x to SLF4J 1.x
• Migrate Log4j to SLF4J
• Parameterize SLF4J's logging statements
• Replace JUL active Level check with corresponding SLF4J method calls
• Replace JUL active Level check with corresponding SLF4J method calls
• Replace JUL log(Level, String, Throwable) with corresponding SLF4J method calls
• Replace JUL log(Level, Throwable, Supplier<String>) with corresponding SLF4J method calls
• Replace Log4j 2.x active Level check with corresponding SLF4J method calls
• SLF4J best practices

Recipes

• Add JBoss LogManager's SLF4J provider
• Change SLF4J log level
• Convert Log4j 1.x MDC.getContext() to getCopyOfContextMap()
• Enhances logging of exceptions by including the full stack trace in addition to the exception message
• Loggers should be named for their enclosing classes
• Match if (is*Enabled()) with logging statements
• MessageFormat.format() in logging statements should use SLF4J parameterized logging
• Optimize log statements
• Remove unnecessary log level guards
• Replace JUL Level.ALL logging with SLF4J's trace level
• Replace JUL Logger creation with SLF4J LoggerFactory
• Replace JUL Logger.config(Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.fine(Supplier<String>) with SLF4J's Logger.atDebug().log(Supplier<String>)
• Replace JUL Logger.finer(Supplier<String>) with SLF4J's Logger.atTrace().log(Supplier<String>)
• Replace JUL Logger.finest(Supplier<String>) with SLF4J's Logger.atTrace().log(Supplier<String>)
• Replace JUL Logger.info(Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.isLoggable(Level.ALL) with SLF4J's Logger.isTraceEnabled
• Replace JUL Logger.isLoggable(Level.CONFIG) with SLF4J's Logger.isInfoEnabled()
• Replace JUL Logger.isLoggable(Level.FINE) with SLF4J's Logger.isDebugEnabled()
• Replace JUL Logger.isLoggable(Level.FINER) with SLF4J's Logger.isTraceEnabled()
• Replace JUL Logger.isLoggable(Level.FINEST) with SLF4J's Logger.isTraceEnabled
• Replace JUL Logger.isLoggable(Level.INFO) with SLF4J's Logger.isInfoEnabled()
• Replace JUL Logger.isLoggable(Level.SEVERE) with SLF4J's Logger.isErrorEnabled()
• Replace JUL Logger.isLoggable(Level.WARNING) with SLF4J's Logger.isWarnEnabled()
• Replace JUL Logger.log(Level.ALL, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.CONFIG, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.FINE, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.FINER, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.FINEST, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.INFO, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.SEVERE, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.log(Level.WARNING, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL Logger.severe(Supplier<String>) with SLF4J's Logger.atError().log(Supplier<String>)
• Replace JUL Logger.warning(Supplier<String>) with SLF4J's Logger.atWarn().log(Supplier<String>)
• Replace JUL logger.log(Level.ALL, String message, Throwable e) with SLF4J's Logger.trace(message, e)
• Replace JUL logger.log(Level.ALL, e, Supplier<String>) with SLF4J's Logger.atTrace().log(Supplier<String>)
• Replace JUL logger.log(Level.CONFIG, String message, Throwable e) with SLF4J's Logger.info(message, e)
• Replace JUL logger.log(Level.CONFIG, e, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL logger.log(Level.FINE, String message, Throwable e) with SLF4J's Logger.debug(message, e)
• Replace JUL logger.log(Level.FINE, e, Supplier<String>) with SLF4J's Logger.atDebug().log(Supplier<String>)
• Replace JUL logger.log(Level.FINER, String message, Throwable e) with SLF4J's Logger.trace(message, e)
• Replace JUL logger.log(Level.FINER, e, Supplier<String>) with SLF4J's Logger.atTrace().log(Supplier<String>)
• Replace JUL logger.log(Level.FINEST, String message, Throwable e) with SLF4J's Logger.trace(message, e)
• Replace JUL logger.log(Level.FINEST, e, Supplier<String>) with SLF4J's Logger.atTrace().log(Supplier<String>)
• Replace JUL logger.log(Level.INFO, String message, Throwable e) with SLF4J's Logger.info(message, e)
• Replace JUL logger.log(Level.INFO, e, Supplier<String>) with SLF4J's Logger.atInfo().log(Supplier<String>)
• Replace JUL logger.log(Level.SEVERE, String message, Throwable e) with SLF4J's Logger.error(message, e)
• Replace JUL logger.log(Level.SEVERE, e, Supplier<String>) with SLF4J's Logger.atError().log(Supplier<String>)
• Replace JUL logger.log(Level.WARNING, String message, Throwable e) with SLF4J's Logger.warn(message, e)
• Replace JUL logger.log(Level.WARNING, e, Supplier<String>) with SLF4J's Logger.atWarn().log(Supplier<String>)
• Replace Log4j 2.x Logger.isEnabled(Level.DEBUG) with SLF4J's Logger.isDebugEnabled()
• Replace Log4j 2.x Logger.isEnabled(Level.ERROR) with SLF4J's Logger.isErrorEnabled()
• Replace Log4j 2.x Logger.isEnabled(Level.INFO) with SLF4J's Logger.isInfoEnabled()
• Replace Log4j 2.x Logger.isEnabled(Level.TRACE) with SLF4J's Logger.isTraceEnabled()
• Replace Log4j 2.x Logger.isEnabled(Level.WARN) with SLF4J's Logger.isWarnEnabled()
• Replace parameterized JUL level call with corresponding SLF4J method calls
• SLF4J logging statements should begin with constants
• String.format() in logging statements should use SLF4J parameterized logging
• Strip toString() from arguments
• Wrap Log4j 1.x MDC.put values in String.valueOf(...)