Github user DrIgor commented on the issue:
https://github.com/apache/zeppelin/pull/1911
@Leemoonsoo @jongyoul thank you! I didn't know about ClassLoaderInterpreter
Unfortunately, our tests don't use InterpreterFactory and will use
unwrapped Interpreter instance. So It won't fix flaky test.
Besides, code inside interpreter itself will use incorrect classloader.
Currently it isn't an issue but someday...
Maybe It's better to wrap IMain or create "scala utils" to share common
code between several scala-speaking interpreters?
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