Spring-cloud-sleuth: Automatic log pattern is not working when using with spring-boot-starter-log4j2

[ezraroi]

Hi,
I am using spring Cloud with spring-boot-starter-log4j2 and looks like the automatic pattern that includes app name, span id and trace id is not set as the docs are saying.

[dsyer]

It's a logback only feature I think (from Spring Boot, so nothing we can fix here anyway).

[ezraroi]

Maybe adding to the documentation will save others time to understand it. I finally found the comment in the source code and figured it out. Thanks anyway

[sdiallo-talend]

Hi ezraroi,

How did you figure out to this problem with log4j2 ?

[hsj1606]

+1, how to make it working with log4j2?

[marcingrzejszczak]

@hsj1606 @sdiallo-talend I guess you have to do exactly what is here https://github.com/spring-cloud/spring-cloud-sleuth/blob/master/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/log/Slf4jSpanLogger.java but using https://logging.apache.org/log4j/2.x/manual/thread-context.html . In other words just write your own implementation of SpanLogger

[nitulkukadia]

I got it working by simply adding log pattern and log4j2 dependancy.
Log4j2:
https://docs.spring.io/spring-boot/docs/current/reference/html/howto-logging.html#howto-configure-log4j-for-logging
Pattern in application.properties:
logging.pattern.console=[%X{X-B3-TraceId},%X{X-B3-SpanId},%X{X-B3-ParentSpanId},%X{X-Span-Export}]

[alwyn]

Did anyone actually test this solution? From the boot docs they state that logging.pattern.console is logback specific...