log4j: package-specific logging

Question

How can I set log4j to log to a different file according to package name?

for example:

com.myname.fred logs to fred.log
com.myname.derek logs to dere         


        

Answer 1

log4j.logger.com.myname.fred=LEVEL, appenderNameForFred
log4j.logger.com.myname.derek=LEVEL, appenderNameForDerek

Answer 2

You have to create two new appenders and set additivity accordingly.

log4j.appender.FRED=org.apache.log4j.RollingFileAppender
log4j.appender.FRED.File=/path/to/fred.log
log4j.appender.FRED.layout=org.apache.log4j.PatternLayout

log4j.appender.DEREK=org.apache.log4j.RollingFileAppender
log4j.appender.DEREK.File=/path/to/derek.log
log4j.appender.DEREK.layout=org.apache.log4j.PatternLayout

log4j.additivity.com.myname.fred=false
log4j.additivity.com.myname.derek=false

log4j.logger.com.myname.fred=DEBUG, FRED
log4j.logger.com.myname.derek=DEBUG, DEREK

Update: Just check if you need to add the below line.

log4j.rootLogger=DEBUG, R, FRED, DEREK

Where R is your regular log file that logs everything except FRED and DEREK.