Hi,

I am revamping a java application. We are planning to user Log4j but I am new to Log4j. My requirement is, I need to use the same log4j property file for 8 different module. I need to know how to configure different file names for different modules in the same log4j file. Thanks for your time

You can split your loggers into different files. With the following example, all logging done to loggers in package "com.myco.a" and any subpackage thereof will be logged to module-a.log (likewise for module b). Now, as long as you separate your modules into packages like this, you're ok.

log4j.logger.com.myco.a=DEBUG, A
log4j.logger.com.myco.b=DEBUG, B

log4j.appender.A=org.apache.log4j.FileAppender
log4j.appender.A.File=a.log
log4j.appender.A.layout=org.apache.log4j.PatternLayout
log4j.appender.A.layout.ConversionPattern=%d{MM-dd@HH:mm:ss} %-5p (%13F:%L) %3x - %m%n

log4j.appender.B=org.apache.log4j.FileAppender
log4j.appender.B.File=b.log
log4j.appender.B.layout=org.apache.log4j.PatternLayout
log4j.appender.B.layout.ConversionPattern=%d{MM-dd@HH:mm:ss} %-5p (%13F:%L) %3x - %m%n

I do understand that, but what if I have to use two different loggers in lets say the same class. How do I get the specified logger a, or b?
Thank you very much for your help!
Regards,
Matt

You just need to create 2 Logger instances using different names.

I have declared fileappender the same way, but some how file is not being generated. what may be the reason? jsptube.com

When declare the "logger" variable, use this to specify de appender: private static Logger logger = Logger.getLogger("com.myco.b");