I want the log to roll over as long as the application is running, but I want the log to start fresh when the application is restarted.
Updated: Based on erickson's feedback, my appender looks like this:
<appender name="myRFA" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="my-server.log"/>
<param name="Append" value="false" />
<param name="MaxFileSize" value="10MB"/>
<param name="MaxBackupIndex" value="10"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="%d{ISO8601} %p - %t - %c - %m%n"/>
</layout>
</appender>
I simply added the following line:
<param name="Append" value="false" />
It now truncates the base log file at startup, but it leaves the rolled files alone.