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线程“main”java中出现异常。lang.NoClassDefFoundError:org/apache/spark/streaming/StreamingContext

spark-streaming sbt intellij-idea apache-spark scala

3

a.moussa · 技术社区 · 7 年前

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

  }
}

以下是错误:

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

我使用以下构建。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Example类,得到了错误。在sbt外壳中,它工作良好。在我的依赖项模块中,我可以找到spark依赖项。代码在intellij中编译。我可以在外部库中看到spark Dependeies(在左侧项目面板中)。你有什么想法吗。这似乎并不复杂。

1 回复 | 直到 7 年前

1

14

mohammad RaoofNia Ryu_hayabusa 5 年前

请删除 provided spark流媒体库中的术语。

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")
    ),

希望这有帮助。

谢谢拉维