log4jの中身はこんな感じです。

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>;
<appender name="classA" class="org.apache.log4j.DailyRollingFileAppender">
<param name="file" value="classA-log" /><param name="DatePattern" value="'.'yyyy-MM-dd"/>
<param name="threshold" value="INFO"/><param name="append" value="true" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy/MM/dd HH:mm:ss},%p,%m%n" />
</layout>
</appender>
<appender name="System" class="org.apache.log4j.DailyRollingFileAppender" >
<param name="file" value="sys-log" /><param name="DatePattern" value="'.'yyyy-MM-dd"/>
<param name="threshold" value="ERROR"/><param name="append" value="true" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss},%p [%t] %c (%F:%L) %m%n" />
</layout>
</appender>
<logger name="util.classA">
<level value="info" />
<appender-ref ref="classA"/>
</logger>
<root>
<level value="error" />
<appender-ref ref="System" />
</root>
</log4j:configuration>