How to use log4j into weblogic 10.3

Hi,
I am migrating an enterprise application from JBoss 4.3 + JBossCache to WebLogic 10.3+Coherence.
I am blocked since I can't get log4j to work inside WL.
I enabled log4j inside the administration console, as stated in the user guide.
Googling I've also found that I have to copy these 2 jars
wllog4j.jar
llog4j-1.2.14.jar
inside my domain lib directory (that is C:\Oracle\Middleware\user_projects\domains\base_domain\lib), and I did it.
Now where should I put the log4j.xml configuration file and how can I tell to WL to use that xml as log4j configuration ?
To give you more information, my classes use log4j in this way:
Logger log = Logger.getLogger(MyClass.class);
And I am constantly getting this error:
log4j:WARN No appenders could be found for logger (it.ltm.ejba.session.EjbAServiceBean).
log4j:WARN Please initialize the log4j system properly.
I hope someone can help me.
I apologize for this stupid question, but really I didn't find a good guide/tutorial on the net.
Thanks in advance.
Edited by: e.gherardini on 3-mar-2010 3.16

Hi Jay, thanks for helping me.
In fact what I am trying to do is a server-wide log4j configuration.
Your solution implies writing-deploying-maintaining 1 log4j configuration file for each application developed inside the application server.
This is not what I want to do.
Digging around WL 10.3 installation folders, I've found a log4j.properties file inside the medrec example application (C:\Oracle\Middleware\wlserver_10.3\samples\domains\medrec).
It uses this properties file setting a startup parameter to the server (file setDomainEnv.cmd):
set JAVA_PROPERTIES=%JAVA_PROPERTIES% -Dlog4j.configuration=file:%LOG4J_CONFIG_FILE%
I would like to do the same starting the server from eclipse 3.5.
I am working on this, I hope you can give some hints.
Thanks a lot

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