Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18488
Hm, backing up, this shouldn't actually work, should it? enums aren't
beans, and this newer error that gets uncovered more directly demonstrates that.
Do you need to define an encoder to use an enum? it should just be
serialized as a string or int already. If not, that's what needs to be fixed.
See also https://issues.apache.org/jira/browse/SPARK-17248
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