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From "Jonas Traub (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-2642) Scala Table API crashes when executing word count example
Date Wed, 09 Sep 2015 09:14:45 GMT
Jonas Traub created FLINK-2642:
----------------------------------

             Summary: Scala Table API crashes when executing word count example
                 Key: FLINK-2642
                 URL: https://issues.apache.org/jira/browse/FLINK-2642
             Project: Flink
          Issue Type: Bug
          Components: Table API
         Environment: current master (0.10)
            Reporter: Jonas Traub


I tried to run the examples provided in the documentation of Flink's Table API. Unfortunately,
the Scala word count example provided in the [documentation|https://ci.apache.org/projects/flink/flink-docs-master/libs/table.html]
doesn't work and does not give a meaningful exception.
(Other examples work fine)

Here my code:
{code:java}
package org.apache.flink.examples.scala

import org.apache.flink.api.scala._
import org.apache.flink.api.scala.table._

object WordCount {

  def main(args: Array[String]): Unit = {

    // set up execution environment
    val env = ExecutionEnvironment.getExecutionEnvironment

    case class WC(word: String, count: Int)
    val input = env.fromElements(WC("hello", 1), WC("hello", 1), WC("ciao", 1))
    val expr = input.toTable
    val result = expr.groupBy('word).select('word, 'count.sum as 'count).toDataSet[WC]
    result.print()
  }

}
{code}

Here the thrown exception:
{code}
Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job execution
failed.
	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1.applyOrElse(JobManager.scala:414)
	at scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
	at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
	at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
	at org.apache.flink.runtime.LeaderSessionMessageFilter$$anonfun$receive$1.applyOrElse(LeaderSessionMessageFilter.scala:36)
	at scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
	at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
	at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
	at org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:33)
	at org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:28)
	at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118)
	at org.apache.flink.runtime.LogMessages$$anon$1.applyOrElse(LogMessages.scala:28)
	at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
	at org.apache.flink.runtime.jobmanager.JobManager.aroundReceive(JobManager.scala:104)
	at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
	at akka.actor.ActorCell.invoke(ActorCell.scala:487)
	at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
	at akka.dispatch.Mailbox.run(Mailbox.scala:221)
	at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.Exception: The user defined 'open(Configuration)' method in class org.apache.flink.api.table.runtime.ExpressionSelectFunction
caused an exception: null
	at org.apache.flink.runtime.operators.RegularPactTask.openUserCode(RegularPactTask.java:1368)
	at org.apache.flink.runtime.operators.chaining.ChainedMapDriver.openTask(ChainedMapDriver.java:47)
	at org.apache.flink.runtime.operators.RegularPactTask.openChainedTasks(RegularPactTask.java:1408)
	at org.apache.flink.runtime.operators.DataSourceTask.invoke(DataSourceTask.java:142)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:581)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at org.apache.flink.api.table.codegen.IndentStringContext$$anonfun$j$2.apply(Indenter.scala:30)
	at org.apache.flink.api.table.codegen.IndentStringContext$$anonfun$j$2.apply(Indenter.scala:23)
	at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
	at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
	at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
	at org.apache.flink.api.table.codegen.IndentStringContext.j(Indenter.scala:23)
	at org.apache.flink.api.table.codegen.GenerateSelect.generateInternal(GenerateSelect.scala:55)
	at org.apache.flink.api.table.codegen.GenerateSelect.generateInternal(GenerateSelect.scala:32)
	at org.apache.flink.api.table.codegen.ExpressionCodeGenerator.generate(ExpressionCodeGenerator.scala:66)
	at org.apache.flink.api.table.runtime.ExpressionSelectFunction.open(ExpressionSelectFunction.scala:46)
	at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:33)
	at org.apache.flink.runtime.operators.RegularPactTask.openUserCode(RegularPactTask.java:1366)
	... 5 more
{code}



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