I have searched, but have been unable to find a way to do this. I need to add an appender after configuration has happened. This is because whether or not the appender is even wanted is dependent on a runtime condition. I've seen plenty of examples using the sifting appender, but I don't want to include the appender in the config file because I don't want to create a dependency on the appender being there (it's an optional component). I've tried this: LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); Logger testcase_logger = lc.getLogger("test"); logAppender.setContext(testcase_logger.getLoggerContext()); testcase_logger.addAppender(logAppender); But I never get any logging events (this is a custom log appender). Test is the base of all the loggers I want logging to this appender (I want anything with a test. at the beginning of the logger name to write to this appender). Any ideas? My custom appender extends AppenderBase<ILoggingEvent>. Jason Corbett