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

Aleksander Kamenik aleksander.kamenik at gmail.com
Fri Mar 24 12:03:36 CET 2017

That makes sense, thanks. Is there a way though for multiple web apps
to use a single common appender within a Tomcat instance?


Aleksander Kamenik

On Fri, Mar 24, 2017 at 12:20 PM, Ceki Gülcü <ceki at qos.ch> wrote:
> 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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Aleksander Kamenik

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