Disabling Log4J Output in Java

Question

How can one quickly turn off all Log4J output using a log4j properties file

User · Accepted Answer

Set level to OFF  instead of DEBUG  INFO

User · Answer

log4j rootLogger OFF

User · Answer

In addition  it is also possible to turn logging off programmatically   Logger getRootLogger   setLevel Level OFF     Or  Logger getRootLogger   removeAllAppenders    Logger getRootLogger   addAppender new NullAppender       These use imports   import org apache log4j Logger  import org apache log4j Level  import org apache log4j NullAppender

User · Answer

Change level to what you want   I am using Log4j2  version 2 6 2   This is simplest way  change to  lt Root level  off  gt   For example  File log4j2 xml Development environment   lt  xml version  1 0  encoding  UTF-8   gt   lt Configuration status  WARN  gt       lt Appenders gt           lt Console name  Console  target  SYSTEM OUT  gt               lt PatternLayout pattern   d HH mm ss SSS    t   -5level  logger 36  -  msg n   gt           lt  Console gt           lt Console name  SimpleConsole  target  SYSTEM OUT  gt               lt PatternLayout pattern   msg n   gt           lt  Console gt       lt  Appenders gt       lt Loggers gt           lt Root level  error  gt               lt AppenderRef ref  Console   gt           lt  Root gt       lt  Loggers gt       lt Loggers gt           lt Root level  info  gt               lt AppenderRef ref  SimpleConsole   gt           lt  Root gt       lt  Loggers gt   lt  Configuration gt    Production environment   lt  xml version  1 0  encoding  UTF-8   gt   lt Configuration status  WARN  gt       lt Appenders gt           lt Console name  Console  target  SYSTEM OUT  gt               lt PatternLayout pattern   d HH mm ss SSS    t   -5level  logger 36  -  msg n   gt           lt  Console gt           lt Console name  SimpleConsole  target  SYSTEM OUT  gt               lt PatternLayout pattern   msg n   gt           lt  Console gt       lt  Appenders gt       lt Loggers gt           lt Root level  off  gt               lt AppenderRef ref  Console   gt           lt  Root gt       lt  Loggers gt       lt Loggers gt           lt Root level  off  gt               lt AppenderRef ref  SimpleConsole   gt           lt  Root gt       lt  Loggers gt   lt  Configuration gt

User · Answer

You can change the level to OFF which should get rid of all logging  According to the log4j website  valid levels in order of importance are TRACE  DEBUG  INFO  WARN  ERROR  FATAL  There is one undocumented level called OFF which is a higher level than FATAL  and turns off all logging   You can also create an extra root logger to log nothing  level OFF   so that you can switch root loggers easily  Here s a post to get you started on that   You might also want to read the Log4J FAQ  because I think turning off all logging may not help  It will certainly not speed up your app that much  because logging code is executed anyway  up to the point where log4j decides that it doesn t need to log this entry

User · Answer

If you want to turn off logging programmatically then use  List lt Logger gt  loggers   Collections  lt Logger gt list LogManager getCurrentLoggers     loggers add LogManager getRootLogger     for   Logger logger   loggers         logger setLevel Level OFF

[java] Disabling Log4J Output in Java

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