Hi, I'm using logback in a runnable jar containing a lift webapp. logback reads its settings from logback.xml file at the root of the jar. This runnable jar can be run in development mode by just using: java -jar myexecutable.jar but also in production mode: java -Drun.mode=production -jar myexecutable.jar I would like to be able to use different file for logback configuration depending on the run.mode. For example in default (development) mode this could be default.logback.xml (or just logback.xml as it is by default) and in production production.default.logback.xml or in test test.default.logback.xml How do I do that? In my app, there is a runnable object Start, with main method, where I probably could set some init options for logback depending on the run mode, which can be detected with System.getProperty("run.mode"). Here is the topic on lift mailing list, about this executable jar, and some last few messages are about trying to figure this out https://groups.google.com/forum/?fromgroups=#!topic/liftweb/uwwIA8FwmU8