myStruts1App.log
myStruts1App.log.1
myStruts1App.log.2

myStrutsApp1.log
myStrutsApp2.log

<appender name="file" class="org.apache.log4j.RollingFileAppender">
<param name="append" value="false" />
<param name="maxFileSize" value="10KB" />
<param name="maxBackupIndex" value="5" />
<param name="file" value="${catalina.home}/logs/myStruts1App.log" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}
%-5p  %c{1}:%L - %m%n />
</layout>
</appender>