Jagmohan Sharma created LOGBACK-1293: ---------------------------------------- Summary: Error with simultaneous %d and %i in RollingFileAppender and FixedWindowRollingPolicy Key: LOGBACK-1293 URL: https://jira.qos.ch/browse/LOGBACK-1293 Project: logback Issue Type: Bug Components: logback-core Reporter: Jagmohan Sharma Assignee: Logback dev list A Exception is being thrown when configuring a TimeBasedRollingPolicy inside a RollingFileAppender and both %d\{} and %i appears in the FileNamePattern.   {code:java} <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>/logs/appName.%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> {code}   The exception: {code:java} [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 {code} -- This message was sent by Atlassian JIRA (v7.3.1#73012)