log4j Appender additivity for custom log level

Question

I have a scenario where I have a separate custom level defined XYZLogLevel for logging and I have 2 rolling file appenders where 2nd appender is specifically reserved to log log messages from XYZLogLevel. However the logs are going in both the files which is undesirable.

Note:-

1. Logs are not package specific, so adding additivity for package wont work.
2. Everything has to be done through log4j.properties file.

Adding LevelRangeFilter to first appender partially resolves it, but when I add 3rd appender for another custom level, then I again see duplication in 2nd and 3rd appender.

log4j.rootCategory=ERROR, F, XYZLOG, LMNLOG

log4j.appender.F=org.apache.log4j.RollingFileAppender
log4j.appender.F.File=f_log.log
log4j.appender.F.MaxFileSize=5MB
log4j.appender.F.MaxBackupIndex=10
log4j.appender.F.layout = org.apache.log4j.PatternLayout
log4j.appender.F.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS} %c{1} [%p] %m%n

log4j.appender.XYZLOG=org.apache.log4j.RollingFileAppender
log4j.appender.XYZLOG.File=xyz_reporting.log
log4j.appender.XYZLOG.threshold=XYZLOG#com.services.domain.xyzlogs.XYZLogLevel
log4j.appender.XYZLOG.filter.a=org.apache.log4j.varia.LevelMatchFilter    
log4j.appender.XYZLOG.filter.a.LevelToMatch=XYZLOG#com.services.domain.xyzlogs.XYZLogLevel
log4j.appender.XYZLOG.filter.a.AcceptOnMatch=true 
log4j.appender.XYZLOG.MaxFileSize=100KB
log4j.appender.XYZLOG.MaxBackupIndex=10
log4j.appender.XYZLOG.layout=org.apache.log4j.PatternLayout
log4j.appender.XYZLOG.layout.ConversionPattern=%m%n

log4j.appender.LMNLOG=org.apache.log4j.RollingFileAppender
log4j.appender.LMNLOG.File=lmn_reporting.log
log4j.appender.LMNLOG.threshold=LMNLOG#com.services.domain.lmnlogs.LMNLogLevel
log4j.appender.LMNLOG.filter.a=org.apache.log4j.varia.LevelMatchFilter    
log4j.appender.LMNLOG.filter.a.LevelToMatch=LMNLOG#com.services.domain.lmnlogs.LMNLogLevel
log4j.appender.LMNLOG.filter.a.AcceptOnMatch=true 
log4j.appender.LMNLOG.MaxFileSize=100KB
log4j.appender.LMNLOG.MaxBackupIndex=10
log4j.appender.LMNLOG.layout=org.apache.log4j.PatternLayout
log4j.appender.LMNLOG.layout.ConversionPattern=%m%n

Maybe this can be solved through org.apache.log4j.varia.DenyAllFilter but somehow I was not able to configure that for properties file. I believe that functionality is only for XML configuration.

Its a very tricky sitution as I dont have the liberty to switch to XML configuration, any help on this would be appreciated guys. Link and examples would be great as I understand them quickly.

Answer 1

I am answering my own question.

First you need to create a logger and set additivity as FALSE.

log4j.logger.XZYLOG=XZYLOG#XYZLOG#com.services.domain.xyzlogs.XYZLogLevel, XYZAPPENDER

log4j.additivity.XZYLOG=false

log4j.logger.LMNLOG=LMNLOG#XYZLOG#com.services.domain.lmnlogs.LMNLogLevel, LMNAPPENDER

log4j.additivity.LMNLOG=false

Then configure the appenders in following way.

log4j.appender.XYZLOGAPPENDER=org.apache.log4j.RollingFileAppender
log4j.appender.XYZLOGAPPENDER.File=xyz_reporting.log
log4j.appender.XYZLOGAPPENDER.threshold=XYZLOG#com.services.domain.xyzlogs.XYZLogLevel
log4j.appender.XYZLOGAPPENDER.MaxFileSize=100KB
log4j.appender.XYZLOGAPPENDER.MaxBackupIndex=10
log4j.appender.XYZLOGAPPENDER.layout=org.apache.log4j.PatternLayout
log4j.appender.XYZLOGAPPENDER.layout.ConversionPattern=%m%n

log4j.appender.LMNLOGAPPENDER=org.apache.log4j.RollingFileAppender
log4j.appender.LMNLOGAPPENDER.File=lmn_reporting.log

log4j.appender.LMNLOGAPPENDER.threshold=LMNLOG#com.services.domain.lmnlogs.LMNLogLevel
log4j.appender.LMNLOGAPPENDER.MaxFileSize=100KB log4j.appender.LMNLOGAPPENDER.MaxBackupIndex=10 log4j.appender.LMNLOGAPPENDER.layout=org.apache.log4j.PatternLayout log4j.appender.LMNLOGAPPENDER.layout.ConversionPattern=%m%n

You may or may not need the filter in this case.

Note: I cannot post company code here thats why I modified the solution.
This is to give you general idea how I have solved this problem.