Your wild guess was right, thanks! From: logback-user-bounces@qos.ch [mailto:logback-user-bounces@qos.ch] On Behalf Of Joern Huxhorn Sent: Tuesday, September 21, 2010 5:27 PM To: logback users list Subject: Re: [logback-user] parameter { } substitution is not happening with our custom appender Hi Bob, I'm making a wild guess: Is it possible that your custom appender is using loggingEvent.getMessage() instead of loggingEvent.getFormattedMessage()? Cheers, Joern. On 21.09.2010, at 15:39, Bob DeRemer wrote: Hi Logback community, We created a custom appender to send logging data to our own storage medium. It extends AppenderBase<ILoggingEvent> like the docs say, but for some reason, any logging statements where we use the logback parameter substitution (i.e. "message with parameter {}", param1), there is no substitution. We have our custom appender AND a FileAppender. The fileappender has the parameter substituted, but the custom one does not. If anyone has any suggestions, I would greatly appreciate. Thanks, Bob DeRemer Senior Director, Architecture and Development http://www.burningskysoftware.com <http://www.burningskysoftware.com/> O: 717.505.7923 M: 717.881.3986 _______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user