Change Log level at runtime without server restart?

I am using the logback as implementation with SL4j interface. Here is the configuration

<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>logs/prod.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">          
        <FileNamePattern>logs/prod.%d{yyyy-MM-dd}.%i.log</FileNamePattern>
        <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            <maxFileSize>700MB</maxFileSize>
        </timeBasedFileNamingAndTriggeringPolicy>
    </rollingPolicy>
</appender>


    <logger name="com.ecom" additivity="false" level="ERROR">
        <appender-ref ref="FILE" />
    </logger>

I want to change the level to Info or debug at runtime through configuration or external property change in production without restarting the server. Is it possible ?

FYI ,I am using Weblogic as application server and also Spring frameworks for other purposes >

Solution

Variable substitution is your friend here. Default values for variables should be helpful as well.