<appender name="INFO_FILE_APPENDER"
          class="ch.qos.logback.core.rolling.RollingFileAppender">
    <encoder>
        <pattern>%d [%thread] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
    <file>${APP_INFO_LOG_FILE}.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
        <fileNamePattern>${APP_INFO_LOG_FILE}.%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
        <minIndex>1</minIndex>
        <maxIndex>2</maxIndex>
    </rollingPolicy>
    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
        <maxFileSize>1GB</maxFileSize>
    </triggeringPolicy>
</appender>

[2017-02-27T10:57:04,533+0000][E][SpringApplication][] - Application startup failed
java.lang.IllegalStateException: Logback configuration error detected:
ERROR in ch.qos.logback.core.rolling.RollingFileAppender[INFO_FILE_APPENDER] - Appender [INFO_FILE_APPENDER] failed to append. java.lang.IllegalArgumentException: Cannot convert 2 of typejava.lang.Integer