flink：scala版本有沖突嗎？

Question

我正在嘗試從IntelliJ 此處編譯kafka示例。 在對依賴項進行了大驚小怪之后，我似乎無法擺脫這個問題：

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

我遇到過一些建議，這表明scala版本存在問題。 當前庫列表：

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

關於我誤入歧途的建議？

Answer 1

問題確實是Scala版本不匹配。 您將混合為Scala 2.11構建的依賴項，例如org.apache.kafka:kafka_2.11:0.8.2.2與默認為Scala 2.10構建的Flink依賴項。

為Scala 2.11構建的依賴項之一引入了scala-library:2.11 jar，它取代了Flink依賴項所需的scala-library:2.10依賴項。 您可以將為Scala 2.10構建的二進制文件用於非Flink依賴項，或者使用Scala 2.11構建並安裝Flink。 有關如何使用不同的Scala版本構建Flink的信息，請參見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

如果只想將引用的Kafka示例的版本更改為0.10-SNAPSHOT ，則必須在pom.xml文件中更改Flink版本，並且必須使用FlinkKafkaProducer代替WriteIntoKafka.java文件中的KafkaSink 。 您不再需要SimpleStringSchema了。 這就是您需要更改的所有內容（不需要其他依賴項）。