The Pulse

Erik's Pulse has been published.

Logging Packages with Log4J

I was looking for a way to log a specific package to its own file using Log4J. Took me a while to figure it out, but here's what I came up with in my log4j.xml file:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">

<!-- Main Rolling Log (by Size) -->
<appender name="R" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="main.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="10MB"/>
<param name="maxBackupIndex" value="10"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss}] [%p] %m%n"/>
</layout>
</appender>

<!-- MyPackage Rolling Log -->
<appender name="P" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="mypackage.log"/>
<param name="Append" value="true"/>
<param name="MaxFileSize" value="10MB"/>
<param name="maxBackupIndex" value="10"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss}] [%p] %m%n"/>
</layout>
</appender>

<!-- MyPackage Logger -->
<logger name="net.thauvin.erik.mypackage" additivity="false">
<appender-ref ref="P"/>
</logger>

<!-- Print only messages of priority INFO or above in the com.example package -->
<category name="com.example">
<priority value="info"/>
</category>

<!-- Root (Default) Logging -->
<root>
<priority value="fatal"/>
<appender-ref ref="R"/>
</root>

</log4j:configuration>

Incidentally, Log4j 1.2.13 was just released.