Vxider commented on issue #3242: com.twitter.heron.streamlet.impl.sources.ComplexSource cannot be cast to org.apache.heron.api.spout.ISpout URL: https://github.com/apache/incubator-heron/issues/3242#issuecomment-486495145 Thank you for your reply, the problem was solved when I downgraded the heron version to 0.17.5.
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