Scala Flink在Java 10上启动失败。TaskManager:java.lang.ClassCastException:[B不能强制转换为[C] 背景_Scala_Apache Flink

Scala Flink在Java 10上启动失败。TaskManager:java.lang.ClassCastException:[B不能强制转换为[C] 背景

scala apache-flink

Scala Flink在Java 10上启动失败。TaskManager:java.lang.ClassCastException:[B不能强制转换为[C] 背景,scala,apache-flink,Scala,Apache Flink,启动Flink时，日志中立即出现故障，随后运行应用程序的尝试全部失败。我已经将故障缩小到特定于Java 10，可能还有其他先决条件复制从下载并解包Flink 1.4.2 切换到Java10。我的特定版本信息在（1）中使用/bin/Start local.sh启动Flink 观察TaskManager日志。例如，cat./log/flink-ming-TaskManager-0-C02TJ6XBG8WN.log。将有大量错误输出，如（2）所示运行任何应用程序。例如，/bin/flink R

启动Flink时，日志中立即出现故障，随后运行应用程序的尝试全部失败。我已经将故障缩小到特定于Java 10，可能还有其他先决条件

复制

从下载并解包Flink 1.4.2

切换到Java10。我的特定版本信息在（1）中

使用

/bin/Start local.sh启动Flink

观察TaskManager日志。例如，

cat./log/flink-ming-TaskManager-0-C02TJ6XBG8WN.log

。将有大量错误输出，如（2）所示

运行任何应用程序。例如，

/bin/flink Run~/git/ming data frameworks poc/flinkpoc/target/scala-2.11/flinkpoc_2.11-0.1-SNAPSHOT.jar——端口900

。我的示例应用程序在（3）中，但据我所知，任何应用程序都会出现这种情况。它应该会失败，如（4）中所示

使用

/bin/Stop local.sh

停止Flink

清空Flink日志目录

切换到Java8。我的特定版本信息在（5）中

重复步骤3-7

它应该显示一条成功消息，如（6）所示。它不应该因错误而失败。TaskManager日志不应该包含步骤4中的错误输出

问题这是一个已知的不兼容吗？没有这样的文档记录。特别是说：

Flink在Linux、Mac OS X和Windows上运行。要能够运行Flink，唯一的要求是有一个工作的Java7.x（或更高版本）安装

如何在Java10上解决这个问题

这是Flink中的一个bug吗？应该向项目上游报告吗

提前感谢您提供的任何建议或帮助

补充资料 (一)

(二)

(三)

build.sbt

SimpleJob.scala

(四)

(五)

(六)

文档已经过时。Flink 1.4放弃了对Java 7的支持，Java版本9和10还不受支持。您需要使用Java 8

更新：

Jira问题是否跟踪Java 9支持。

感谢您的澄清。遇到这个问题令人惊讶（甚至违反直觉）。很高兴听到这是一个已知的问题。仅供参考，我已经打开了一个请求来澄清/修复这个问题：谢谢。希望这能帮助以后遇到这个问题的人。

$ uname -a
Darwin C02TJ6XBG8WN 16.7.0 Darwin Kernel Version 16.7.0: Tue Jan 30 11:27:06 PST 2018; root:xnu-3789.73.11~1/RELEASE_X86_64 x86_64

$ java -version
java version "10.0.1" 2018-04-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)

2018-05-11 17:19:05,353 WARN  akka.remote.ReliableDeliverySupervisor                        - Association with remote system [akka.tcp://flink@localhost:6123] has failed, address is now gated for [5000] ms. Reason: [[B cannot be cast to [C] 
2018-05-11 17:19:10,428 WARN  akka.remote.ReliableDeliverySupervisor                        - Association with remote system [akka.tcp://flink@localhost:6123] has failed, address is now gated for [5000] ms. Reason: [Disassociated] 
2018-05-11 17:19:23,111 ERROR akka.remote.Remoting                                          - [B cannot be cast to [C
java.lang.ClassCastException: [B cannot be cast to [C
    at akka.remote.artery.FastHash$.ofString(LruBoundedCache.scala:18)
    at akka.remote.serialization.ActorRefResolveCache.hash(ActorRefResolveCache.scala:61)
    at akka.remote.serialization.ActorRefResolveCache.hash(ActorRefResolveCache.scala:55)
    at akka.remote.artery.LruBoundedCache.getOrCompute(LruBoundedCache.scala:110)
    at akka.remote.RemoteActorRefProvider.resolveActorRef(RemoteActorRefProvider.scala:403)
    at akka.actor.SerializedActorRef.readResolve(ActorRef.scala:433)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at java.base/java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1250)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2087)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1585)
    at java.base/java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2346)
    at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2240)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2078)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1585)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
    at akka.serialization.JavaSerializer$$anonfun$1.apply(Serializer.scala:328)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)
    at akka.serialization.JavaSerializer.fromBinary(Serializer.scala:328)
    at akka.serialization.Serialization.akka$serialization$Serialization$$deserializeByteArray(Serialization.scala:156)
    at akka.serialization.Serialization$$anonfun$deserialize$2.apply(Serialization.scala:142)
    at scala.util.Try$.apply(Try.scala:192)
    at akka.serialization.Serialization.deserialize(Serialization.scala:136)
    at akka.remote.MessageSerializer$.deserialize(MessageSerializer.scala:30)
    at akka.remote.DefaultMessageDispatcher.payload$lzycompute$1(Endpoint.scala:64)
    at akka.remote.DefaultMessageDispatcher.payload$1(Endpoint.scala:64)
    at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:82)
    at akka.remote.EndpointReader$$anonfun$akka$remote$EndpointReader$$deliverAndAck$1.apply(Endpoint.scala:1047)
    at akka.remote.EndpointReader$$anonfun$akka$remote$EndpointReader$$deliverAndAck$1.apply(Endpoint.scala:1046)
    at scala.collection.Iterator$class.foreach(Iterator.scala:891)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
    at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
    at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
    at akka.remote.EndpointReader.akka$remote$EndpointReader$$deliverAndAck(Endpoint.scala:1046)
    at akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:980)
    at akka.actor.Actor$class.aroundReceive(Actor.scala:502)
    at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:446)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
    at akka.actor.ActorCell.invoke(ActorCell.scala:495)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
    at akka.dispatch.Mailbox.run(Mailbox.scala:224)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
    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)

name := "flinkpoc"

version := "0.1-SNAPSHOT"

scalaVersion := "2.11.8"

val flinkVersion = "1.4.2"

libraryDependencies := Seq(
  "org.apache.flink" %% "flink-scala" % flinkVersion % "provided",
  "org.apache.flink" %% "flink-streaming-scala" % flinkVersion % "provided"
)

package flinkpoc

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

object SimpleJob {

  def main(args: Array[String]): Unit = {
    val env = StreamExecutionEnvironment.getExecutionEnvironment

    val inStream = env.fromCollection(Range(0, 100).toList)
    val outStream = inStream.map(_ * 100)
    outStream.print

    env.execute("flinkpoc.SimpleJob")
  }

}

org.apache.flink.client.program.ProgramInvocationException: The program execution failed: Couldn't retrieve the JobExecutionResult from the JobManager.
    at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:492)
    at org.apache.flink.client.program.StandaloneClusterClient.submitJob(StandaloneClusterClient.java:105)
    at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:456)
    at org.apache.flink.streaming.api.environment.StreamContextEnvironment.execute(StreamContextEnvironment.java:66)
    at org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.scala:638)
    at flinkpoc.SimpleJob$.main(SimpleJob.scala:14)
    at flinkpoc.SimpleJob.main(SimpleJob.scala)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:525)
    at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:417)
    at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:396)
    at org.apache.flink.client.CliFrontend.executeProgram(CliFrontend.java:802)
    at org.apache.flink.client.CliFrontend.run(CliFrontend.java:282)
    at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1054)
    at org.apache.flink.client.CliFrontend$1.call(CliFrontend.java:1101)
    at org.apache.flink.client.CliFrontend$1.call(CliFrontend.java:1098)
    at org.apache.flink.runtime.security.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30)
    at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1098)
Caused by: org.apache.flink.runtime.client.JobExecutionException: Couldn't retrieve the JobExecutionResult from the JobManager.
    at org.apache.flink.runtime.client.JobClient.awaitJobResult(JobClient.java:300)
    at org.apache.flink.runtime.client.JobClient.submitJobAndWait(JobClient.java:387)
    at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:481)
    ... 20 more
Caused by: org.apache.flink.runtime.client.JobClientActorConnectionTimeoutException: Lost connection to the JobManager.
    at org.apache.flink.runtime.client.JobClientActor.handleMessage(JobClientActor.java:219)
    at org.apache.flink.runtime.akka.FlinkUntypedActor.handleLeaderSessionID(FlinkUntypedActor.java:104)
    at org.apache.flink.runtime.akka.FlinkUntypedActor.onReceive(FlinkUntypedActor.java:71)
    at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)
    at akka.actor.Actor$class.aroundReceive(Actor.scala:502)
    at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
    at akka.actor.ActorCell.invoke(ActorCell.scala:495)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
    at akka.dispatch.Mailbox.run(Mailbox.scala:224)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
    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)

$ java -version
java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)

Program execution finished
Job with JobID b41e26f012480d2842cbb8bde0098180 has finished.
Job Runtime: 379 ms