Github user DrIgor commented on the issue:
https://github.com/apache/zeppelin/pull/1911
Yes, I tried ClassloaderInterpreter but it didn't fix original issue.
https://github.com/apache/zeppelin/blob/master/ignite/src/test/java/org/apache/zeppelin/ignite/IgniteInterpreterTest.java#L69
Here test creates unwrapped interpreter instance.
So we need wrap every IgniteInterpreter usage. Besides, wrapper restores
classloader _after_ interpreter call and interpreter itself use broken
classloader.
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