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Posted to issues@camel.apache.org by "Dietrich Schulten (Jira)" <ji...@apache.org> on 2019/12/23 11:47:00 UTC
[jira] [Created] (CAMEL-14324) Brave MDC Integration does not work
in Karaf
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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