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.---
