I am using logback 1.2.3 . I have added the below dependency to my pom.xml <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>1.2.3</version> </dependency> My configuration looks like below <configuration> <appender name="CONSOLE" class= "ch.qos.logback.core.ConsoleAppender"> <Target>System.out</Target> <encoder> <pattern>%p [%d{yyyy-MM-dd HH:mm:ss,SSS}] %c{3}:[%C{1}:%M:%L] - [%t] - %m%n </pattern> </encoder> </appender> <root level="INFO"> <appender-ref ref= "CONSOLE"/> <appender-ref ref="datadog"/> </root> </configuration> Filename & line number is not showing up. A question mark is coming. INFO [2018-01-12 07:06:54] c.v.s.f.FlowStoreWarmer:[?:?:?] - [FlowStoreWarmer_flow_cache_warmup_thread] - no work to do for cid 19099 Can some one let me know what is going wrong? Do I have add logback-core also as dependency? Thanks,