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https://issues.apache.org/jira/browse/FLINK-2642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14745565#comment-14745565
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Timo Walther commented on FLINK-2642:
-------------------------------------
Will look into it...
> 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
> Assignee: Timo Walther
>
> 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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