Hi there. Using <slf4j.version>1.7.5</slf4j.version> <logback.version>1.0.13</logback.version> And, with the following in logback.xml: <!-- Copy encoder from console --> <encoder> <!-- <pattern>%d{ISO8601} [%thread] rid:%X{trackingId} %-5level %logger{5} - %msg%n</pattern> --> <!-- <pattern>%d{ISO8601} [%thread] rid:%X{trackingId} %-5level %logger{5}.%M:%L - %msg%n</pattern> --> <pattern>%d{ISO8601} [%thread] rid:%X{trackingId} %-5level %class{5}.%M:%L - %msg%n</pattern> <immediateFlush>true</immediateFlush> <outputPatternAsHeader>true</outputPatternAsHeader> </encoder> This outputs #logback.classic pattern: %d{ISO8601} [%thread] rid:%X{trackingId} %-5level %class{5}.%M:%L - %msg%n 2013-06-13 12:55:49,486 [main] rid: TRACE ?.?:? - entry Changing to the first commented pattern, gets me: #logback.classic pattern: %d{ISO8601} [%thread] rid:%X{trackingId} %-5level %logger{5} - %msg%n 2013-06-13 14:35:20,450 [main] rid: TRACE d.d.o.EnvironmentFactory - entry Second commented pattern: #logback.classic pattern: %d{ISO8601} [%thread] rid:%X{trackingId} %-5level %logger{5}.%M:%L - %msg%n 2013-06-13 14:36:37,689 [main] rid: TRACE d.d.o.EnvironmentFactory.?:? - entry Any idea what I am doing wrong here? The point was to get method name and line numbers, as per this: http://logback.qos.ch/manual/layouts.html#conversionWord Any clues? Thanks in advance. Mads -- Med venlig hilsen/Regards Chefarkitekt/Chief Architect cand.scient.dat, Ph.d., Mads Bondo Dydensborg Dansk BiblioteksCenter A/S, Tempovej 7-11, 2750 Ballerup, Tlf. +45 29 84 00 42