log4j Log output of a specific class to a specific appender

Question

I use log4j and would like to route the output of certain Loggers to specific files    I already have multiple appenders in place  Now  to make debugging easier  I want to tell log4j that the output generated by a specific class  e g  foo bar Baz  should be written to a specific log file   Can this be done

User · Accepted Answer

An example   log4j rootLogger ERROR  logfile  log4j appender logfile org apache log4j DailyRollingFileAppender log4j appender logfile datePattern  - dd  log  log4j appender logfile File log radius-prod log log4j appender logfile layout org apache log4j PatternLayout log4j appender logfile layout ConversionPattern  -6r  d ISO8601   -5p  40 40c  x -  m n  log4j logger foo bar Baz DEBUG  myappender log4j additivity foo bar Baz false  log4j appender myappender org apache log4j DailyRollingFileAppender log4j appender myappender datePattern  - dd  log  log4j appender myappender File log access-ext-dmz-prod log log4j appender myappender layout org apache log4j PatternLayout log4j appender myappender layout ConversionPattern  -6r  d ISO8601   -5p  40 40c  x -  m n

User · Answer

Here s an answer regarding the XML configuration  note that if you don t give the file appender a ConversionPattern it will create 0 byte file and not write anything    lt  xml version  1 0  encoding  UTF-8    gt   lt  DOCTYPE log4j configuration SYSTEM  log4j dtd  gt    lt log4j configuration xmlns log4j  http   jakarta apache org log4j   gt       lt appender name  console  class  org apache log4j ConsoleAppender  gt           lt param name  Target  value  System out   gt           lt layout class  org apache log4j PatternLayout  gt               lt param name  ConversionPattern  value   -5p  c 1  -  m n   gt           lt  layout gt       lt  appender gt        lt appender name  bdfile  class  org apache log4j RollingFileAppender  gt           lt param name  append  value  false   gt           lt param name  maxFileSize  value  1GB   gt           lt param name  maxBackupIndex  value  2   gt           lt param name  file  value   tmp bd log   gt           lt layout class  org apache log4j PatternLayout  gt               lt param name  ConversionPattern  value   -5p  c 1  -  m n   gt           lt  layout gt       lt  appender gt        lt logger name  com example mypackage  additivity  false  gt           lt level value  debug   gt           lt appender-ref ref  bdfile   gt       lt  logger gt        lt root gt           lt priority value  info   gt           lt appender-ref ref  bdfile   gt           lt appender-ref ref  console   gt       lt  root gt    lt  log4j configuration gt

[java] log4j: Log output of a specific class to a specific appender

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