Hello Jack I don't know how to do it for the rootLogger, but here's how I did enable a debug level for my whole app: LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); lc.getLogger("be.mydomain.testapp").setLevel(Level.DEBUG); Using the following imports: import org.slf4j.LoggerFactory; import ch.qos.logback.classic.Level; import ch.qos.logback.classic.LoggerContext; If anyone knows how to do it for the rootLogger, please let me know (as it can be annoying to enable debug logs for every package of the dependencies...). Best regards Andrew -----Original Message----- From: juminoz Sent: Tuesday, December 13, 2011 12:14 AM To: logback-user@qos.ch Subject: [logback-user] Enable Debugging Mode Programmatically? I was wondering if there is a way to enable debug mode programmatically. Since I'm not allowed to use configuration file, I'm currently configure everything programmatically. Recently, I ran into an issue where RollingFileAppender stop writing to file though FileAppender works perfectly fine. In fact, RollingFileAppender was also working last week and nothing that I'm aware of has changed since. Please let me know if there is a way to enable debug since doing it using configuration file (logback.xml) doesn't seem to be working. Thanks, Jack -- View this message in context: http://old.nabble.com/Enable-Debugging-Mode-Programmatically--tp32961424p329... Sent from the Logback User mailing list archive at Nabble.com. _______________________________________________ Logback-user mailing list Logback-user@qos.ch http://mailman.qos.ch/mailman/listinfo/logback-user