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From "Alexander Chermenin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-5319) ClassCastException when reusing an inherited method as KeySelector for different classes
Date Mon, 12 Dec 2016 16:07:59 GMT
Alexander Chermenin created FLINK-5319:
------------------------------------------

             Summary: ClassCastException when reusing an inherited method as KeySelector for
different classes
                 Key: FLINK-5319
                 URL: https://issues.apache.org/jira/browse/FLINK-5319
             Project: Flink
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.2.0
            Reporter: Alexander Chermenin


Code sample:
{code}static abstract class A {
    int id;
    A(int id) {this.id = id; }
    int getId() { return id; }
}

static class B extends A { B(int id) { super(id % 3); } }
static class C extends A { C(int id) { super(id % 2); } }

private static B b(int id) { return new B(id); }
private static C c(int id) { return new C(id); }

/**
 * Main method.
 */
public static void main(String[] args) throws Exception {
    StreamExecutionEnvironment environment =
        StreamExecutionEnvironment.getExecutionEnvironment();

    B[] bs = IntStream.range(0, 10).mapToObj(Test::b).toArray(B[]::new);
    C[] cs = IntStream.range(0, 10).mapToObj(Test::c).toArray(C[]::new);

    DataStreamSource<B> bStream = environment.fromElements(bs);
    DataStreamSource<C> cStream = environment.fromElements(cs);

    bStream.keyBy((KeySelector<B, Integer>) A::getId).print();
    cStream.keyBy((KeySelector<C, Integer>) A::getId).print();

    environment.execute();
}
{code}

This code throws next exception:
{code}Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job
execution failed.
	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$7.apply$mcV$sp(JobManager.scala:901)
	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$7.apply(JobManager.scala:844)
	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$7.apply(JobManager.scala:844)
	at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
	at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:401)
	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253)
	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346)
	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.RuntimeException: Could not extract key from org.sample.flink.examples.Test$C@5e1a8111
	at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:75)
	at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:39)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:746)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:724)
	at org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collect(StreamSourceContexts.java:84)
	at org.apache.flink.streaming.api.functions.source.FromElementsFunction.run(FromElementsFunction.java:127)
	at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:75)
	at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:56)
	at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:269)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: Could not extract key from org.sample.flink.examples.Test$C@5e1a8111
	at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:61)
	at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:32)
	at org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:83)
	at org.apache.flink.streaming.runtime.io.StreamRecordWriter.emit(StreamRecordWriter.java:86)
	at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:72)
	... 11 more
Caused by: java.lang.ClassCastException: org.sample.flink.examples.Test$C cannot be cast to
org.sample.flink.examples.Test$B
	at org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:59)
	... 15 more{code}



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