Using Log4J 1.*, how can I write two packages to two separate files?

Question

I have the following two packages:

com.mycorp.project.first
com.mycorp.project.second

I\'d like to configure Log4J (SLF4J) to write the logs from one pac

Answer 1

put dynamiclly file path .in log4j.properties

log4j.appender.FILE.File=${file.name}

And in java set file path System.setProperty("file.name", FILEPATH);

Answer 2

Create two appenders LOG1 and LOG2, one for each log file. After that define two categories(one for each package) with reference to these appenders int the log4j config file.

<category name="com.mycorp.project.first" additivity="true">
    <priority value="TRACE"/>
    <appender-ref ref="LOG1"/>
</category>

Appender2

<category name="com.mycorp.project.second" additivity="true">
    <priority value="TRACE"/>
    <appender-ref ref="LOG2"/>
</category>

Answer 3

you just specify 2 appenders, but give same output log file name for both.

#same appender for both packages
log4j.logger.package1=INFO,MyCommonLogger    
log4j.logger.package2=INFO,MyCommonLogger

log4j.appender.MyCommonLogger=org.apache.log4j.DailyRollingFileAppender
log4j.appender.MyCommonLogger.layout=org.apache.log4j.PatternLayout
log4j.appender.MyCommonLogger.layout.ConversionPattern=%t %d{MM/dd/yy HH:mm:ss} %x %-5p %c %M - %m%n

#single log file for logs from both packages
log4j.appender.MyCommonLogger.File=/somewhereonserver/log/mysinglelogfile.log

Answer 4

Try this is the example of properties file:

log4j.rootLogger=DEBUG, CONSOLE
# Each package has different appender name     
log4j.logger.com.mycorp.project.first=DEBUG, FIRST
log4j.logger.com.mycorp.project.second=DEBUG, SECOND

log4j.appender.FIRST=org.apache.log4j.RollingFileAppender
log4j.appender.FIRST.File=./first.log
log4j.appender.FIRST.layout=org.apache.log4j.PatternLayout

log4j.appender.SECOND=org.apache.log4j.RollingFileAppender
log4j.appender.SECOND.File=./second.log
log4j.appender.SECOND.layout=org.apache.log4j.PatternLayout

or this for XML (only highlight important part):

<!-- FIRST appender definition -->
<appender name="FIRST" class="org.apache.log4j.FileAppender">
    ...
</appender> 

<!-- SECOND appender definition -->
<appender name="SECOND" class="org.apache.log4j.FileAppender">
    ...
</appender>

<!-- logger package com.mycorp.project.first -->
<logger name="com.mycorp.project.first">
    <level value="DEBUG" />
    <appender-ref ref="FIRST"/>
</logger>

<!-- logger for package com.mycorp.project.second -->
<logger name="com.mycorp.project.second">
    <level value="DEBUG" />
    <appender-ref ref="SECOND"/>
</logger>