scala - 线程 "main"java.lang.NoClassDefFoundError : org/apache/spark/streaming/StreamingContext 中的异常

Question

大家好，下面的代码中似乎找不到 StreamingContext 类。

import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.{SparkConf, SparkContext}
object Exemple {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setMaster("local[*]").setAppName("Exemple")
    val sc = new SparkContext(conf)
    val ssc = new StreamingContext(sc, Seconds(2)) //this line throws error

  }
}

这是错误:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/streaming/StreamingContext
    at Exemple$.main(Exemple.scala:16)
    at Exemple.main(Exemple.scala)
Caused by: java.lang.ClassNotFoundException: org.apache.spark.streaming.StreamingContext
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more

Process finished with exit code 1

我使用以下 build.sbt 文件:

name := "exemple"

version := "1.0.0"

scalaVersion := "2.11.11"

// https://mvnrepository.com/artifact/org.apache.spark/spark-sql
libraryDependencies += "org.apache.spark" %% "spark-sql" % "2.2.0"
// https://mvnrepository.com/artifact/org.apache.spark/spark-streaming
libraryDependencies += "org.apache.spark" %% "spark-streaming" % "2.2.0" % "provided"
// https://mvnrepository.com/artifact/org.apache.spark/spark-streaming-kafka-0-10
libraryDependencies += "org.apache.spark" %% "spark-streaming-kafka-0-10" % "2.2.0"

我使用 intellij Run 按钮运行示例类，但出现错误。在 sbt shell 中它工作正常。进入我的依赖模块，我可以找到 Spark 依赖。代码在 intellij 中编译。我可以在外部库中看到 spark 依赖项(在左侧项目面板内)。
你有什么主意吗。看起来并不复杂。

Answer 1

请删除 provided来自 spark-streaming 库的术语。

libraryDependencies += "org.apache.spark" %% "spark-streaming" % "2.2.0" 

更改后，仍然存在进一步的依赖性问题，请排除重复的 jar。

 "org.apache.spark" %% "spark-streaming-kafka-0-10" % "2.2.0" excludeAll(
      ExclusionRule(organization = "org.spark-project.spark", name = "unused"),
      ExclusionRule(organization = "org.apache.spark", name = "spark-streaming"),
      ExclusionRule(organization = "org.apache.hadoop")
    ),

希望这可以帮助。

谢谢
拉维