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https://issues.apache.org/jira/browse/FLINK-12504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16839718#comment-16839718
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Ken Krugler commented on FLINK-12504:
-------------------------------------
If I Google "Flink user mailing list", the first hit is for
[https://flink.apache.org/community.html#mailing-lists]
On this page is a Subscribe link for the *user*@flink.apache.org mailing list.
> NullPoint here NullPointException there.. It's every where
> ----------------------------------------------------------
>
> Key: FLINK-12504
> URL: https://issues.apache.org/jira/browse/FLINK-12504
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Reporter: Chethan UK
> Priority: Major
>
> I was trying to push data from Kafka to Cassandra, after around 220K
> sometimes, 300K points are pushed into C*, this
> java.lang.NullPointerException throws in..
> ```
> java.lang.NullPointerException
> at
> org.apache.flink.api.common.functions.util.PrintSinkOutputWriter.write(PrintSinkOutputWriter.java:73)
> at
> org.apache.flink.streaming.api.functions.sink.PrintSinkFunction.invoke(PrintSinkFunction.java:81)
> at
> org.apache.flink.streaming.api.functions.sink.SinkFunction.invoke(SinkFunction.java:52)
> at
> org.apache.flink.streaming.api.operators.StreamSink.processElement(StreamSink.java:56)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$BroadcastingOutputCollector.collect(OperatorChain.java:649)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$BroadcastingOutputCollector.collect(OperatorChain.java:602)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
> at
> org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
> at
> org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collect(StreamSourceContexts.java:104)
> at
> org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collectWithTimestamp(StreamSourceContexts.java:111)
> at
> org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.emitRecordWithTimestamp(AbstractFetcher.java:398)
> at
> org.apache.flink.streaming.connectors.kafka.internal.KafkaFetcher.emitRecord(KafkaFetcher.java:185)
> at
> org.apache.flink.streaming.connectors.kafka.internal.KafkaFetcher.runFetchLoop(KafkaFetcher.java:150)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:711)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:93)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:57)
> at
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:97)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
> at java.lang.Thread.run(Thread.java:748)
> ```
> How can normal Flink Users understand these error? The Job's keep failing and
> it's very unstable to be considered in production...
>
> In RoadMap, is there plans to make Kotlin supported language as well?
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