Dietrich Schulten created CAMEL-14324:
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Summary: Brave MDC Integration does not work in Karaf
Key: CAMEL-14324
URL: https://issues.apache.org/jira/browse/CAMEL-14324
Project: Camel
Issue Type: Bug
Components: camel-zipkin
Reporter: Dietrich Schulten
When useMDCLogging is set to true on a CamelContext with camel-zipkin, the
application fails to start. The error message is
`java.lang.NoClassDefFoundError:
brave/internal/propagation/CorrelationFieldScopeDecorator`.
The reason might be that the `brave.context.slf4j.MDCScopeDecorator` from
brave-context-slf4j, introduced into ZipkinTracer with CAMEL-12721, extends
`brave.internal.propagation.CorrelationFieldScopeDecorator`, which is not
exported by the brave bundle
[https://github.com/openzipkin/brave/tree/5.6.5/brave], according to its
[bnd.bnd|[https://github.com/openzipkin/brave/blob/5.6.5/brave/bnd.bnd]] file.
Possibly this is why the [instance
creation|https://github.com/apache/camel/blob/e46b2d916aa748dfd292190ed52b9d3413ceb70d/components/camel-zipkin/src/main/java/org/apache/camel/zipkin/ZipkinTracer.java#L576]
fails.
The solution could be to use only exported brave classes (effectively
recreating MDCScopeDecorator) or maybe let OSGi create the `MDCScopeDecorator`
instance.
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