Hiya, I love the fact that in logback I can do this for a level: <logger name="foo" level="${foo.bar.log.level:-debug}"/> I would love to be able to do the following as well: <appender-ref ref="${foo.bar.log.appender:-console}"/> So that I can switch between different appenders during build time. At the moment, If I try that, I get this warning from logback (0.9.21) 11:17:32,676 |-ERROR in ch.qos.logback.core.joran.action.AppenderRefAction - Could not find an appender named [${foo.bar.log.appender:-console}]. Did you define it below in the config file? 11:17:32,676 |-ERROR in ch.qos.logback.core.joran.action.AppenderRefAction - See http://logback.qos.ch/codes.html#appender_order for more details. Is this achievable? -=david=- -- View this message in context: http://old.nabble.com/Appender-Ref-Default-Value-tp28605941p28605941.html Sent from the Logback User mailing list archive at Nabble.com.