In logback.xml, I am trying to use "AsyncAppender" as below. But I see empty system.log file.

When I directly use "RollingFileAppender" I see log entries in system.log file.

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   <appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender" queueSize="512">

      <discardingThreshold>0</discardingThreshold> 

      <appender-ref ref="LOGFILE" />

  </appender>

    <appender name="LOGFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">

        <file>${data.dir:-..}/logs/system.log</file>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

            <!-- rollover daily -->

            <fileNamePattern>${data.dir:-..}/logs/system-%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>

            <!-- keep max of 10 days -->

            <maxHistory>10</maxHistory>

            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

                <!-- or whenever the file size reaches 50MB -->

                <maxFileSize>50MB</maxFileSize>

            </timeBasedFileNamingAndTriggeringPolicy>

        </rollingPolicy>

        <encoder>

            <pattern>%d org:%X{orgName} env:%X{envName} %thread %-5level %logger{25} - %C{0}.%M\(\) : %msg%n</pattern>

        </encoder>

    </appender>

    <root level="${log.level:-DEBUG}">

        

        <appender-ref ref="ASYNC"/>

        <!--appender-ref ref="LOGFILE"/-->

        

    </root>

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Why is ASyncAppender not flushing log evenst to log file used by RollingFileAppender? I am using "logback v 1.1.2".

Thanks,

Hemana