java - Wildcard pattern for RoutingAppender of Log4j2

Question

I am trying to use the new RoutingAppender of Log4j2 to route the different logs based on the MDC (ThreadContext in Log4j2). What I want to do is the following:

• If MDC map has $contextId -> Append to $contextId appender (specific log)
• If MDC does not have $contextId -> Append to main appender (general log)

I want to achieve this using a wildcard pattern in the tag and then filter using the key parameter in the for contextId (${ctx:contextId}) and using the default (without key paramenter) for the main appender, however I don't know which value is that wildcard.

Any help is appreciated, maybe I am approaching this from the wrong path. I have been reading about Filters but don't seem to work as I want.

Thanks!

Answer 1

Does this answer your question? https://issues.apache.org/jira/browse/LOG4J2-326

Remko