Hello Neil,

FileNamePattern does not support the %d when used within FixedWindowRollingPolicy. Only %i is supported. It's a currentlimitation of the code.

I suggest that you enter a jira issue requesting simultaneous support for %d and %i. Referencing or copying this thread would set a context for the problem which would be helpful.

Cheers,

Neil Lott wrote:
Hi,
I'm using a FileNamePattern with a FixedWindowPolicy:
Here's my appender:
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
       <file>/usr/local/mystro/logs/MSAServer.log</file>
       <append>true</append>
       <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
           <FileNamePattern>/usr/local/neil/logs/MSAServer.%i.%d{yyyyMMdd-HHmmss}.gz</FileNamePattern> <MinIndex>1</MinIndex>
           <MaxIndex>3</MaxIndex>
       </rollingPolicy>
       <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
           <MaxFileSize>1KB</MaxFileSize>
       </triggeringPolicy>
       <layout class="ch.qos.logback.classic.PatternLayout">
           <Pattern>%d{ISO8601} %-5level [%thread] \(%logger{0}.%M:%L\\) - %msg%n</Pattern>
       </layout>
   </appender>
Here's the exception when the file rolls -- I had to alter the rollover method of FixedWindowPolicy in order to catch throwable to see what was going on:
java.lang.IllegalArgumentException: Cannot convert 3 of typejava.lang.Integer
   at ch.qos.logback.core.rolling.helper.DateTokenConverter.convert(DateTokenConverter.java:60)
[snip]

Is this an intentional restriction to make the file name pattern have %i first and then %d?
Thanks,
Neil