apache-spark - 线程 "main"java.lang.NoClassDefFoundError : org/apache/spark/sql/SQLContext 中出现异常

Question

我使用的是IntelliJ 2016.3版本。

import sbt.Keys._
import sbt._

object ApplicationBuild extends Build {

  object Versions {
    val spark = "1.6.3"
  }

  val projectName = "example-spark"

  val common = Seq(
    version := "1.0",
    scalaVersion := "2.11.7"
  )

  val customLibraryDependencies = Seq(
    "org.apache.spark" %% "spark-core" % Versions.spark % "provided",
    "org.apache.spark" %% "spark-sql" % Versions.spark % "provided",
    "org.apache.spark" %% "spark-hive" % Versions.spark % "provided",
    "org.apache.spark" %% "spark-streaming" % Versions.spark % "provided",

    "org.apache.spark" %% "spark-streaming-kafka" % Versions.spark
      exclude("log4j", "log4j")
      exclude("org.spark-project.spark", "unused"),

    "com.typesafe.scala-logging" %% "scala-logging" % "3.1.0",

    "org.slf4j" % "slf4j-api" % "1.7.10",

    "org.slf4j" % "slf4j-log4j12" % "1.7.10"
      exclude("log4j", "log4j"),

    "log4j" % "log4j" % "1.2.17" % "provided",

    "org.scalatest" %% "scalatest" % "2.2.4" % "test"
  )

尽管我如上所示正确地提到了所有依赖项，但我一直在运行时异常以下。

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/sql/SQLContext
    at example.SparkSqlExample.main(SparkSqlExample.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassNotFoundException: org.apache.spark.sql.SQLContext
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 6 more

在这个网站上进行了更多调查。发现这主要是由于 buld.sbt 中的条目不适当或版本不匹配造成的。但就我而言，一切看起来都很好，如上所示。 请指出我哪里做错了？

Answer 1

我猜这是因为您将依赖项标记为“已提供”，但显然您(或 IDEA)没有提供它们。

尝试删除“provided”选项或(我的首选方式):将具有 main 方法的类移动到 src/test/scala