<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss,SSS} %X{userid} %level %msg%n</pattern>
        </encoder>
    </appender>

    <root>
        <level value="INFO" />
        <appender-ref ref="STDOUT" />
    </root>
</configuration>