[logback-user] multiple web apps tomcat rolling file appender

Ceki Gülcü ceki at qos.ch
Fri Mar 24 11:20:12 CET 2017

As soon as multiple FileAppender instances write to the same file, 
prudent mode is mandatory. The fact that the FileAppender instances 
reside in the same JVM is totally irrelevant.

On 3/24/2017 10:43, Aleksander Kamenik wrote:
> Hi!
> I'm having trouble with several web apps logging to a single rolling
> file appender in one JVM (Tomcat 8.0) without prudent mode. I've tried
> several setups with logback.xml configurations however no matter what
> I do I get apps overwriting already rolled over files.
> For testing I've set rollover to each minute and getting apps to
> overwrite already rolled over files is trivial. Reading the manual
> though I understand this should work just fine provided all the apps
> are using the same JVM and therefore the same appender.
> This does not seem to be the case though. During startup I see each
> app log "AppenderAction - Naming appender as [COMMON]" for example. I
> presume this means every app creates their own appender instead of
> reusing the existing one.
> The slf4j and logback jar files are located in tomcat's lib directory
> as is the logback.xml file. I've tried context based log separation
> too with shared logback.xml as well as per app logback.xml but the
> result for shared appender is always the same.
> I have a feeling I'm missing something obvious and important here.
> Regards,

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