类路径中缺少符号 'type scala.package.Serializable'

Question

我的类路径缺少可序列化和可克隆的类。 我不知道如何解决这个问题。

我有一个看起来像这样的 sbt 应用程序

name := "realtime-spark-streaming"

version := "0.1"
resolvers += "confluent" at "https://packages.confluent.io/maven/"
resolvers += "Public Maven Repository" at "https://repository.com/content/repositories/pangaea_releases"


val sparkVersion = "3.2.0"
// https://mvnrepository.com/artifact/org.apache.spark/spark-core
libraryDependencies += "org.apache.spark" %% "spark-core" % "3.2.0"

// https://mvnrepository.com/artifact/org.apache.spark/spark-streaming
libraryDependencies += "org.apache.spark" %% "spark-streaming" % "3.2.0"

libraryDependencies += "org.apache.spark" %% "spark-sql" % "3.2.0"

libraryDependencies += "com.walmart.grcaml" % "us-aml-commons" % "latest.release"



libraryDependencies += "org.apache.spark" %% "spark-streaming-kafka-0-10" % sparkVersion
//libraryDependencies += "org.apache.spark" % "spark-streaming-kafka-0-10_2.11" % "3.2.0" % "2.1.3"

//libraryDependencies += "org.slf4j" % "slf4j-simple" % "1.7.12"
// https://mvnrepository.com/artifact/org.apache.kafka/kafka
libraryDependencies += "org.apache.kafka" %% "kafka" % "6.1.0-ccs"
resolvers += Resolver.mavenLocal
scalaVersion := "2.13.6"

当我进行 sbt 构建时，我得到了..

Symbol 'type scala.package.Serializable' is missing from the classpath.
This symbol is required by 'class org.apache.spark.sql.SparkSession'.
Make sure that type Serializable is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'SparkSession.class' was compiled against an incompatible version of scala.package.
import org.apache.spark.sql.{DataFrame, SparkSession}

Symbol 'type scala.package.Serializable' is missing from the classpath.
This symbol is required by 'class org.apache.spark.sql.Dataset'.
Make sure that type Serializable is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'Dataset.class' was compiled against an incompatible version of scala.package.
  def extractData(spark: SparkSession, configDetails: ReadProperties, pcSql: String, query: String): DataFrame = {

我的依赖树只显示 jar，但这似乎是类/包冲突或丢失..

Answer 1

您使用的是不兼容的 Scala 版本 (2.13.6)。来自 Spark 文档：

Spark runs on Java 8/11, Scala 2.12, Python 3.6+ and R 3.5+. Python 3.6
support is deprecated as of Spark 3.2.0. Java 8 prior to version 8u201 support 
is deprecated as of Spark 3.2.0. For the Scala API, Spark 3.2.0 uses Scala 2.12. 
You will need to use a compatible Scala version (2.12.x).

如果您使用 2.12.x 系列的 Scala 版本，应该没问题。