Lesson 22: Using RollingFileAppender

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

<appender name="FileAppender_Comp3" class="org.apache.log4j.rolling.RollingFileAppender"> 

<rollingPolicy name="file" class="org.apache.log4j.rolling.TimeBasedRollingPolicy"> 
<param name="FileNamePattern" value="log/Comp3_%d{dd-MM-yyyy HH-mm-ss}.log" />
</rollingPolicy> 

<triggeringPolicy class="org.apache.log4j.rolling.SizeBasedTriggeringPolicy">
<param name="MaxFileSize" value="3kb"/>
</triggeringPolicy>

<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %5p [%t] %c (%F:%L) - %m%n"/>
</layout>

</appender>

note:
- max file size jangan pake kata 'kb' atau 'mb' tapi lansung aja dalam satuan byte (tanpa kata byte tentunya) misalnya utk 3kb masukkan jumlah 3072
- satu hal lagi yang krusial, ternyata perlu library tambahan selain log4j.jar yaitu apache-log4j-extras.jar keduanya harus yang versi sama, gw pake yang versi 1.2.17

kalo yang pake maven tambahin baris berikut di pom.xml:
<dependency>
<groupId>log4j</groupId>
<artifactId>apache-log4j-extras</artifactId>
<version>1.2.17</version>

</dependency>

Sumber: http://stackoverflow.com/questions/12257477/how-to-use-sizebasedtriggeringpolicy-with-timebasedrollingpolicy-in-log4j