java – flink：scala版本冲突？

我试图在IntelliJ中编译here的kafka样本.经过很多与依赖关系的讨论已经遇到了这个问题,我似乎无法过去：

15/10/25 12:36:34 ERROR actor.ActorSystemImpl: Uncaught fatal error from thread [flink-akka.actor.default-dispatcher-4] shutting down ActorSystem [flink]
java.lang.NoClassDefFoundError: scala/runtime/AbstractPartialFunction$mcVL$sp
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.flink.runtime.jobmanager.MemoryArchivist.handleMessage(MemoryArchivist.scala:80)
at org.apache.flink.runtime.FlinkActor$class.receive(FlinkActor.scala:32)
at org.apache.flink.runtime.jobmanager.MemoryArchivist.org$apache$flink$runtime$LogMessages$$super$receive(MemoryArchivist.scala:59)
at org.apache.flink.runtime.LogMessages$class.receive(LogMessages.scala:26)
at org.apache.flink.runtime.jobmanager.MemoryArchivist.receive(MemoryArchivist.scala:59)
at akka.actor.ActorCell.newActor(ActorCell.scala:567)
at akka.actor.ActorCell.create(ActorCell.scala:587)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:460)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:482)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:282)
at akka.dispatch.Mailbox.run(Mailbox.scala:223)
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)


Caused by: java.lang.ClassNotFoundException: scala.runtime.AbstractPartialFunction$mcVL$sp
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 28 more

我遇到了一些暗示这是scala版本问题的概念.当前库列表：

flink-runtime-1.0-SNAPSHOT
flink-streaming-java-1.0-SNAPSHOT
flink-connector-kafka-1.0-SNAPSHOT
flink-java8-1.0-SNAPSHOT
flink-core-1.0-SNAPSHOT
flink-java-1.0-SNAPSHOT
org.apache.hadoop:hadoop-core:1.2.1
flink-clients-1.0-SNAPSHOT
org.apache.kafka:kafka-clients:0.8.2.2
org.apache.kafka:kafka_2.11:0.8.2.2
flink-optimizer-1.0-SNAPSHOT
org.apache.sling:org.apache.sling.commons.json:2.0.6
de.javakaffee:kryo-serializers:0.28
com.github.scopt:scopt_2.11:3.3.0
org.clapper:grizzled-slf4j_2.9.0:0.6.6
com.typesafe.akka:akka-osgi_2.11:2.4.0
com.typesafe.akka:akka-slf4j_2.11:2.4.0

关于我误入歧途的建议？

解决方法:

问题确实是Scala版本不匹配.您正在混合为Scala 2.11构建的依赖项,例如org.apache.kafka：kafka_2.11：0.8.2.2,带有Flink依赖项,默认情况下为Scala 2.10构建.

为Scala 2.11构建的依赖项之一引入了scala-library：2.11 jar,它取代了flink依赖项所需的scala-library：2.10依赖项.您可以将为Scala 2.10构建的二进制文件用于非Flink依赖项,也可以使用Scala 2.11构建和安装Flink.有关如何使用不同的Scala版本构建Flink,请参阅https://ci.apache.org/projects/flink/flink-docs-master/setup/building.html#build-flink-for-a-specific-scala-version.

卡夫卡的例子

如果您只想将引用的Kafka示例的版本更改为0.10-SNAPSHOT,则必须更改pom.xml文件中的Flink版本,并且必须在WriteIntoKafka.java文件中使用FlinkKafkaProducer而不是KafkaSink.您不再需要SimpleStringSchema了.这就是你必须改变的全部内容(不需要额外的依赖项).

原文地址：https://codeday.me/bug/20190519/1136446.html