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

[Ceki Gülcü]

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,
>