[logback-user] Redirecting logback logs to log4j

Johan Bos johan.bos at c6.eu
Wed Aug 19 11:06:20 CEST 2009

I already read the documentation,

I only omitted that logback was also considered as one binder as well

So I can't have both slf4j-to-log4j and logback, this point is clear now

At first what I wanted was to redirect all logs from log4j to slf4j and us
logback as implementation, but it seems that the client-app.war use some
log4j non-overload classes, not included into the bridge lib:

That s why I decided to go with the log4j implementation, but I forgot that
even if logback support natively slf4, that still makes it one of the
implementation, so it can't be both in use.

My bad, I will test it, as I don't have direct dependency over logback with
this library.
I should work


-----Message d'origine-----
De : logback-user-bounces at qos.ch [mailto:logback-user-bounces at qos.ch] De la
part de Ceki Gulcu
Envoyé : mercredi 19 août 2009 10:52
À : logback users list
Objet : Re: [logback-user] Redirecting logback logs to log4j

Hello Johan,

Could you please read the slf4j manual [1] and the page on Bridging
legacy APIs [2]. Those pages contain the explanation you are
seeking. However, if you are still confused about how to proceed,
please contact this list once again.

[1] http://www.slf4j.org/manual.html
[2] http://www.slf4j.org/legacy.html

Johan Bos wrote:
> Hi,
> I designed component, packaged in jars, using slf4j and logback, this 
> library is then packaged with a third party application using log4j.
> I presumed that slf4j and logback could be used to change your log 
> system depending on the loaded libraries of your classpath.
> Here my configuration:
> my_library.jar using only slf4j and at some point logback dependencies
> included with it:
> slf4j-to-log4j.jar
> slf4j.jar
> log4j.jar à already present in the war.
> logback-*.jar
> All these libraries are installed into a third part webapp application 
> (client_app.war), directly under the WEB-INF/lib directory of this 
> application.
> This application has a log4j.properties, in the classes directory, 
> changes are made to create a log4j logger.
> At my understanding, my library’s log events should be redirecting from 
> slf4j/logback to log4j, using the log4j.properties, and so be written in 
> the “client_app..log” configured?
> Am I wrong?
> Do I still need a logback.xml to be located under the classes of this 
> webapps as well?
> Regards,
> Johan Bos**
Ceki Gülcü
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