Github user tzulitai commented on the issue: https://github.com/apache/flink/pull/5568 @zhangminglei the `ClassLoaderTestProgram`, AFAIK, tests parent/child first classloading. If what you are concerned about is that there is no end-to-end test for this fix, it is actually covered by the existing Kafka end-to-end test, which uses the `Kafka010Example` program.
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