Rotating log files in log4j
In Java, it is pretty standard to use log4j to handle your logging. In a production environment, you rarely want to all your log data to be kept in a single file. If you did, eventually that file would become very large and difficult to use especially when you are looking for specific error messages.
A good practice is to employ rotating log files. Old log data gets moved into other files and really old log data gets removed automatically. It is pretty easy to setup this style of logging up in log4j. You need to use a RollingFileAppender.
log4j.rootCategory=WARN, stdout, rollFile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - <%m>%n
log4j.appender.rollFile=org.apache.log4j.RollingFileAppender
log4j.appender.rollFile.File=/web/logs/sample.log
log4j.appender.rollFile.MaxFileSize=10MB
log4j.appender.rollFile.MaxBackupIndex=5
log4j.appender.rollFile.layout=org.apache.log4j.PatternLayout
log4j.appender.rollFile.layout.ConversionPattern=%d %p [%c] - <%m>%n
In the above example, I send log data to both the console and a rotation log file.
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