nwangtw 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-486469040 Looks possible. The package name was com.twitter.* before it was changed to org.apache.* since version 0.20. My guess is that you are building old example against the new library.
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