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https://issues.apache.org/jira/browse/FLINK-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426937#comment-16426937
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Julio Biason commented on FLINK-9141:
-------------------------------------
Just a note: We got a problem with split/side outputs too, but instead of NPE,
we got an error message:
{code:java}
java.lang.UnsupportedOperationException: Cannot use split/select with side
outputs.
{code}
... and the "map" trick solved this too.
> Calling getSideOutput() and split() on one DataStream causes NPE
> ----------------------------------------------------------------
>
> Key: FLINK-9141
> URL: https://issues.apache.org/jira/browse/FLINK-9141
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.4.0
> Reporter: Chesnay Schepler
> Priority: Critical
>
> Calling both {{getSideOutput()}} and {{split()}} on one DataStream causes a
> {{NullPointerException}} to be thrown at runtime.
> As a work-around one can add a no-op map function before the split() call.
> Exception:
> {code}
> Caused by: java.lang.NullPointerException
> at
> org.apache.flink.streaming.api.collector.selector.DirectedOutput.<init>(DirectedOutput.java:79)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain.createOutputCollector(OperatorChain.java:326)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain.<init>(OperatorChain.java:128)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:274)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> Reproducer:
> {code}
> private static final OutputTag<String> tag = new OutputTag<String>("tag") {};
> public static void main(String[] args) throws Exception {
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> DataStream<String> dataStream1 = env.fromElements("foo");
> SingleOutputStreamOperator<String> processedStream = dataStream1
> .process(new ProcessFunction<String, String>() {
> @Override
> public void processElement(String value, Context ctx,
> Collector<String> out) {
> }
> });
> processedStream.getSideOutput(tag)
> .print();
> processedStream
> .map(record -> record)
> .split(Collections::singletonList)
> .select("bar")
> .print();
> env.execute();
> }
> {code}
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