This works actually, by placing the .jar file into the lib and the lib/bootstrap folder and then just applying the changes to the logback.xml like usually. <appender name="GELF" class="de.siegmar.logbackgelf.GelfUdpAppender"> <graylogHost>ip</graylogHost> <graylogPort>12201</graylogPort> </appender> I am using de.siegmar:logback-gelf/1.0.3. Issue resolved for me. ... View more