Kotlin Logging

We use quarkus logging as a lightweight logging framework for Kotlin. The following api dependencies are used for the configuration:

api("org.slf4j:slf4j-api:$slf4jVersion")
api("org.jboss.slf4j:slf4j-jboss-logmanager:$jbossLogManagerVersion")

Furthermore, the following dependencies are used to configure the log message format.

com.fasterxml.jackson.module:jackson-module-kotlin
com.fasterxml.jackson.datatype:jackson-datatype-jsr310

MDC Contextual Logging

We add implicit context data such as appId and transactionId to possible log messages via Mapped Diagnostic Context (MDC). We import MDC via:

import org.slf4j.MDC

A key-value pair is used at every endpoint via MDC.put(key, value) to add a key and the corresponding value to the MDC.