Github user marevol commented on the issue:
https://github.com/apache/incubator-predictionio/pull/336
Although I'm not sure about old plugin features, in my fix, I put plugin
jar files with --jars on spark-submit:
https://github.com/jpioug/incubator-predictionio/commit/70d117c1e353e170e1d8108308446c2661dbac6d#diff-fe08516b0f04bfd5f37f138874840766
To build plugins, I also modified build.sbt.
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