[jira] [Created] (FLINK-9141) Calling getSideOutput() and split() on one DataStream causes NPE

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-9141:
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             Summary: 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


Calling both {{getSideOutput()}} and {{split()}} on one DataStream causes a {{NullPointerException}} to be thrown.

As a temporary 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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