Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/4473
@tzulitai it's failing on
```
The implementation of the RichSinkFunction is not serializable. The object
probably contains or references non serializable fields.
org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:100)
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.clean(StreamExecutionEnvironment.java:1548)
org.apache.flink.streaming.api.datastream.DataStream.clean(DataStream.java:183)
org.apache.flink.streaming.api.datastream.DataStream.addSink(DataStream.java:1131)
```
FYI, I merged this PR into my 1.3.2 source code.
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