WEB-INF/classes/logback.xml

<configuration debug="true" scan="true" scanPeriod="10 minutes">
    <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener"/>

    <!-- loggers omitted -->

    <!-- Daily rolling-file appender. -->
    <appender name="RFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!-- ${catalina.home} is a system property set in tomcat-jsvc.sh -->
        <File>${catalina.home}/logs/tomcat.log</File>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} %-5level %logger{40} - %msg%n</pattern>
        </encoder>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- Rollover file daily. -->
            <fileNamePattern>${catalina.home}/logs/tomcat.%d.log</fileNamePattern>
            <!-- Keep 30 days of history. -->
            <maxHistory>30</maxHistory>
        </rollingPolicy>
    </appender>
    <root level="WARN">
        <appender-ref ref="RFILE"/>
    </root>
</configuration>