Github user uce commented on the pull request: https://github.com/apache/flink/pull/1818#issuecomment-200802077 The changes look good and make parts where user code is serialized very clear. :+1: I've verified that the `ScalaShellITCase` with the change in this PR fails for the current master. I'm wondering whether it is possible to make the test for this more explicit by adding a JAR with the example program outlined in the JIRA issue to the `ClassLoaderITCase`. In any case, +1 to merge. It's your call whether you add a further class loader test or not.
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