[logback-user] How to start my logback before anything in an application

Hello, I have actually an API which use logback and add some specific functions. this API initialize logback in code : joranConfigurator(myconfig.file) I dont have any logback.xml in my classpath. My question is how can i start this API (and then logback) at application startup before all the other frameworks and APIs (spring, hibernate, axis...) I mean the same way logback init itself with logback.xml at startup Thanks