how to make log4j to write to the console as well

Question

Is there any way to tell to log4j to write its log to the file and to the console  thanks there are my properties   log4j rootLogger DEBUG console R log4j rootLogger INFO  FILE  log4j appender CONSOLE org apache log4j ConsoleAppender log4j appender CONSOLE Target System out log4j appender CONSOLE layout org apache log4j PatternLayout log4j appender CONSOLE layout conversionPattern  d yyyy-MM-dd HH mm ss SSS   -5p -  m n  log4j appender FILE org apache log4j RollingFileAppender log4j appender FILE File log4j log log4j appender FILE MaxFileSize 512KB log4j appender FILE MaxBackupIndex 3 log4j appender FILE layout org apache log4j PatternLayout log4j appender FILE layout conversionPattern  d yyyy-MM-dd HH mm ss SSS   -5p -  m n

User · Answer

This works well for console in debug mode  log4j appender console org apache log4j ConsoleAppender log4j appender console Threshold DEBUG log4j appender console Target System out log4j appender console layout org apache log4j PatternLayout log4j appender console layout conversionPattern  d yyyy-MM-dd HH mm ss SSS   -5p -  m n

User · Answer

Your root logger definition is a bit confused  See the log4j documentation   This is a standard Java properties file  which means that lines are treated as key value pairs   Your second log4j rootLogger line is overwriting the first  which explains why you aren t seeing anything on the console appender   You need to merge your two rootLogger definitions into one   It looks like you re trying to have DEBUG messages go to the console and INFO messages to the file   The root logger can only have one level  so you need to change your configuration so that the appenders have appropriate levels   While I haven t verified that this is correct  I d guess it ll look something like this   log4j rootLogger DEBUG console file log4j appender console org apache log4j ConsoleAppender log4j appender file org apache log4j RollingFileAppender   Note that you also have an error in casing - you have console lowercase in one place and in CAPS in another

User · Answer

Write the root logger as below for logging on both console and FILE   log4j rootLogger ERROR console FILE  And write the respective definitions like Target  Layout  and ConversionPattern  MaxFileSize for file etc

User · Answer

Your log4j File should look something like below read comments     Define the types of logger and level of logging     log4j rootLogger   DEBUG console  FILE    Define the File appender     log4j appender FILE org apache log4j FileAppender        Define Console Appender     log4j appender console org apache log4j ConsoleAppender        Define the layout for console appender  If you do not    define it  you will get an error     log4j appender console layout org apache log4j PatternLayout    Set the name of the file     log4j appender FILE File log out    Set the immediate flush to true  default      log4j appender FILE ImmediateFlush true    Set the threshold to debug mode     log4j appender FILE Threshold debug    Set the append to false  overwrite     log4j appender FILE Append false    Define the layout for file appender     log4j appender FILE layout org apache log4j PatternLayout     log4j appender FILE layout conversionPattern  m n

[java] how to make log4j to write to the console as well

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