Logback scan not working

Question

I am having trouble getting the auto scan functionality of logback to work. It doesn't seem to pick up the changes. I have added debug="true" to section and reading it's output, all seems fine. It clearly says the logback.xml file is being monitored for changes every 30 seconds. I am at a loss as to why changes are not being picked up. Just looking for some guidance on how I can troubleshoot this further. Thank you.

I should mention that logback is logging to the file just fine, just that changes to logback configuration file are not being picked up.

logback.xml file

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="30 seconds" debug="true">

    <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener" />  

    <property name="LOGS_PATH" value="C:\\Users\\****\\Desktop\\css_dev\\q_logs" />

    <appender name="scheduledTasksAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOGS_PATH}/scheduledTasks.log</file>

        <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
            <fileNamePattern>${LOGS_PATH}/scheduledTasks.%i.log.zip</fileNamePattern>
            <minIndex>1</minIndex>
            <maxIndex>25</maxIndex>
        </rollingPolicy>

        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <maxFileSize>5MB</maxFileSize>
        </triggeringPolicy>

        <encoder>
            <pattern>%d{MMM/dd/yyyy HH:mm:ss} %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>

    <logger name="tasks" level="warn" additivity="false">
        <appender-ref ref="scheduledTasksAppender"/>
    </logger>
</configuration>

Output to Tomcat log when web application starts:

|-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
|-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
|-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/C:/Users/*****/Desktop/css_dev/ProjectQ/build/web/WEB-INF/classes/logback.xml]
|-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Setting ReconfigureOnChangeFilter scanning period to 30 seconds
|-INFO in ReconfigureOnChangeFilter{invocationCounter=0} - Will scan for changes in [[C:\Users\*****\Desktop\css_dev\ProjectQ\build\web\WEB-INF\classes\logback.xml]] every 30 seconds. 
|-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Adding ReconfigureOnChangeFilter as a turbo filter
|-INFO in ch.qos.logback.core.joran.action.StatusListenerAction - Added status listener of type [ch.qos.logback.core.status.OnConsoleStatusListener]
|-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
|-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
|-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/C:/Users/*****/Desktop/css_dev/ProjectQ/build/web/WEB-INF/classes/logback.xml]
|-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Setting ReconfigureOnChangeFilter scanning period to 30 seconds
|-INFO in ReconfigureOnChangeFilter{invocationCounter=0} - Will scan for changes in [[C:\Users\*****\Desktop\css_dev\ProjectQ\build\web\WEB-INF\classes\logback.xml]] every 30 seconds. 
|-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - Adding ReconfigureOnChangeFilter as a turbo filter
|-INFO in ch.qos.logback.core.joran.action.StatusListenerAction - Added status listener of type [ch.qos.logback.core.status.OnConsoleStatusListener]
|-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender]
|-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender]
|-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [scheduledTasksAppender]
|-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [scheduledTasksAppender]
|-INFO in ch.qos.logback.core.rolling.FixedWindowRollingPolicy@298f464e - Will use zip compression
|-INFO in ch.qos.logback.core.rolling.FixedWindowRollingPolicy@298f464e - Will use zip compression
|-WARN in ch.qos.logback.core.rolling.FixedWindowRollingPolicy@298f464e - Large window sizes are not allowed.
|-WARN in ch.qos.logback.core.rolling.FixedWindowRollingPolicy@298f464e - Large window sizes are not allowed.
|-WARN in ch.qos.logback.core.rolling.FixedWindowRollingPolicy@298f464e - MaxIndex reduced to 21
|-WARN in ch.qos.logback.core.rolling.FixedWindowRollingPolicy@298f464e - MaxIndex reduced to 21
|-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
|-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
|-INFO in ch.qos.logback.core.rolling.RollingFileAppender[scheduledTasksAppender] - Active log file name: C:\Users\*****\Desktop\css_dev\q_logs/scheduledTasks.log
|-INFO in ch.qos.logback.core.rolling.RollingFileAppender[scheduledTasksAppender] - Active log file name: C:\Users\*****\Desktop\css_dev\q_logs/scheduledTasks.log
|-INFO in ch.qos.logback.core.rolling.RollingFileAppender[scheduledTasksAppender] - File property is set to [C:\Users\*****\Desktop\css_dev\q_logs/scheduledTasks.log]
|-INFO in ch.qos.logback.core.rolling.RollingFileAppender[scheduledTasksAppender] - File property is set to [C:\Users\*****\Desktop\css_dev\q_logs/scheduledTasks.log]
|-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [tasks] to WARN
|-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [tasks] to WARN
|-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [tasks] to false
|-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [tasks] to false
|-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [scheduledTasksAppender] to Logger[tasks]
|-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [scheduledTasksAppender] to Logger[tasks]
|-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
|-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
|-INFO in ch.qos.logback.classic.joran.JoranConfigurator@5b63e18f - Registering current configuration as safe fallback point
|-INFO in ch.qos.logback.classic.joran.JoranConfigurator@5b63e18f - Registering current configuration as safe fallback point

Answer 1

Update (May, 2019) : The bug seems to be fixed now.

=============================================================================

With logback 1.1.7, scanPeriod needs to be explicitly mentioned. Otherwise logback will not scan for changes. This is due to recently introduced bug (Here is the link).