Hello everyone, I've a very uncommon configuration. I'm on SAP Netweaver AS :-( For some class loading reasons, I need to deploy separately a .ear file containing the Hibernate .jar files and all the .jar dependencies of hibernate (including log4j, slf4j-api and commons-logging) as a so called by SAP, "heavy resource" http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/bf0d57db-0c01-0010-6f... Then I deploy separately the application .ear that does NOT contain the .jar already included in the hibernate .ear With log4j it worked. Now if... 1) I include all the logback libraries in the hibernate .ear I don't get any error, but when I deploy the application .ear logback doesn't start working! probably because the logback-* files are not in that .ear and they doesn't look for the logback.xml (that I included correcty, and locally on tomcat works...) And if.. 2) I include all logging related libraries in the application .ear when some of the classes of hibernate (that are in the other .ear) try to use something about logging, they got a class not found exception.. I'm totally confused, I'm trying to divide the libraries in many different combinations, but I didn't find any working solution. I think the case 1) might be ok, but I need to force the initialization of logback from the application.ear (that does not contain its libraries) How can I do that? can someone give me a SVN link to the code that starts all the logback stuff? I can even create just that class in my application to force logback initialization.. Thanks