SLF4J and logback with jonas

<[email protected]>
Newsgroups gmane.comp.java.objectweb.jonas
Message-ID <[email protected]>
Hi

Has anyone configured slf4j and logback in an  ear that wad deployed in jonas 5
? 
For my own, I have tried to put  logback-classic-0.9.24.jar, 
logback-core-0.9.24.jar, slf4j-api-1.6.1.jar and logback.xml
  in the  lib/ext directory of ther server, in the lib directory of the ear but
I have no logs ...

Thank's
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