Hi!

You can set the classloader.parent-first-patterns.additional configuration
to load additional classes from the lib directory. See [1] for more details.

What classes are causing the ClassNotFoundException? From the default value
of classloader.parent-first-patterns.default all classes in
org.apache.flink package should be loaded correctly.

[1]
https://nightlies.apache.org/flink/flink-docs-release-1.13/docs/ops/debugging/debugging_classloading/#inverted-class-loading-and-classloader-resolution-order

Fan Xie <f...@linkedin.com> 于2022年3月23日周三 07:43写道:

> Hi Flink Community,
>
> Recently I implemented a new metrics reporter to report Flink runtime
> metrics to a Kafka topic. After building the project, I move my reporter
> jar file from my build folder to the plugin folder:
>
> COPY build/flink-diagnostics-message-reporter-${VERSION}.jar 
> ${FLINK_HOME}/plugins/flink-diagnostics-message-reporter/flink-diagnostics-message-reporter.jar
>
>
> But then I see lots of ClassNotFoundException when I tried to start a test
> job with this new metrics reporter. Looks like the problem is that the
> metrics reporter plugin can not get access to some of the jars in the
> /opt/flink/lib folder. By reading this document:
> https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/filesystems/plugins/,
> looks like there is a whitelist to define what packages can be accessed by
> the plugins. Is there any way to config this whitelist so that the plugin
> jar can get accessed to classes in this folder? If this can't work, are
> there other solutions for this problem like changing the classpath for the
> plugin?
> Plugins | Apache Flink
> <https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/filesystems/plugins/>
> Plugins # Plugins facilitate a strict separation of code through
> restricted classloaders. Plugins cannot access classes from other plugins
> or from Flink that have not been specifically whitelisted. This strict
> isolation allows plugins to contain conflicting versions of the same
> library without the need to relocate classes or to converge to common
> versions.
> nightlies.apache.org
>
> Best,
> Fan
>

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