exception logs not present in file logs

Question

In spring boot project the logback is configured as below..Now the problem is if there is any exception its not present in logged file but its showing in stdout.

<configuration debug="true" scan="true" scanPeriod="30 seconds">

    <timestamp key="bySecond" datePattern="yyyy-MM-dd:HH-mm-ss.SSS"/>
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <append>true</append>
        <file>/var/log/app/backend-business-workflow/${MY_POD_NAMESPACE}_${HOSTNAME}_application.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>/var/log/app/backend-business-workflow/archive/${MY_POD_NAMESPACE}_${HOSTNAME}_application.log.%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
            <maxFileSize>50MB</maxFileSize>
            <maxHistory>60</maxHistory>
            <totalSizeCap>20GB</totalSizeCap>
        </rollingPolicy>

        <encoder class="net.logstash.logback.encoder.LogstashEncoder">
<!--            <pattern>"timestamp":"%date","requestId":"%X{x_request_id}","spanId":"%X{x_span_id}","level":"%level","threadId":"[%thread]","class":"[%file:%line]","message":"%msg"%n</pattern>-->
            <timestampPattern>yyyy-MM-dd HH:mm:ss.SSS</timestampPattern>
            <includeCallerData>true</includeCallerData>
            <includeMdcKeyName>x_request_id</includeMdcKeyName>
            <includeMdcKeyName>x_span_id</includeMdcKeyName>
        </encoder>
    </appender>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%date %X{x_request_id} %X{x_span_id} %level [%thread] [%file:%line] %msg%n</pattern>
            <outputPatternAsHeader>true</outputPatternAsHeader>
        </encoder>
    </appender>

<!--    <logger >-->
<!--&lt;!&ndash;        <level value="INFO" />&ndash;&gt;-->
<!--        <appender-ref ref="STDOUT" />-->
<!--        <appender-ref ref="FILE" />-->
<!--    </logger>-->

    <root >
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>