log4j2 RollingFile Appender requires date pattern

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I have defined a RollingFile Appender in log4j2 

<RollingFile name="Locserver" append="true" fileName="locserver.log" filePattern="locserver-%i.log">
    <PatternLayout>
        <pattern>%d{ISO8601} [%t] %p %c %L - %m%n</pattern>
    </PatternLayout>
    <Policies>
        <SizeBasedTriggeringPolicy size="50 MB"></SizeBasedTriggeringPolicy>
                <DefaultRolloverStrategy>10</DefaultRolloverStrategy>
    </Policies>
</RollingFile>

However when I try to run this I get an error

IllegalStateException : Pattern does not contain a date at org.apache.logging.log4j.core.appender.rolling.PatternProcessor.getNExtTime(PatternProcessor.java:91)

This goes away as soon as I put a date pattern in filePattern for example, locserver-%d{MM-dd-yyyy}-%i.log. But I dont want the date in the log names. Is a bug or something wrong with my config?

log4j2
3 Answers
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