Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2664
@greghogan I think that when an immediate dependency is "provided", then
its transitive dependencies are not pulled. If a user adds a "provided"
`flink-streaming-connector-kafka-0.9_2.10`, then no Kafka dependency will be
pulled into the user program uber jar.
Consequently, all transitive dependencies should be added to the `lib`
folder, which is what we would get by uber-jaring the Kafka connector.
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