Hi,

I think an error exists on your logback documentation.
Indeed, the prudent mode description of the RollingFileAppender (http://logback.qos.ch/manual/appenders.html#RollingFileAppender) indicates the file property FileAppender should be left blank.
However, in the logging separation page (http://logback.qos.ch/manual/loggingSeparation.html), the last example does not respect this rule :

...
<appender name="FILE-${contextName}" class="ch.qos.logback.core.FileAppender">
<file>${contextName}.log</file>
<prudent>true</prudent>
...

How you an explaination ?

Regards,

Antoine