无法找到或加载 main class sbt-assembly 可执行 jar

Question

我已经为它们定义了项目依赖关系和合并策略，以使用 sbt-assembly 插件生成 jar 文件。另外，未来 jar 中的主要 class 也已定义。在我创建 jar 文件并尝试使用 bash 脚本对其进行运行后，我收到错误消息：

Error: Could not find or load main class benchmarks.Main

Main 在src/main/scala/benchmarks/Main 中，它是一个具有 main 方法的对象。这个项目可能存在什么问题？

这是我的 bash 脚本：

#!/usr/bin/env bash
java -cp "target/scala-2.11/benchmarking.jar" benchmarks.Main

build.sbt 具有已定义的依赖项：

version := "0.1"

scalaVersion := "2.11.8"

assemblyJarName in assembly := "benchmarking.jar"

mainClass in assembly := Some("benchmarks.Main")

val sparkVersion = "2.2.0"

resolvers += "Spark Packages Repo" at "http://dl.bintray.com/spark-packages/maven"
libraryDependencies ++= Seq(
  "neo4j-contrib" % "neo4j-spark-connector" % "2.1.0-M4",
  "org.apache.spark" %% "spark-core" % sparkVersion % "provided",
  "org.apache.spark" %% "spark-sql" % sparkVersion  % "provided",
  "com.typesafe" % "config" % "1.3.0",
  "org.neo4j.driver" % "neo4j-java-driver" % "1.5.1",
  "com.opencsv" % "opencsv" % "4.1",
  "com.databricks" %% "spark-csv" % "1.5.0"
)

assemblyMergeStrategy in assembly := {
  case PathList("org","aopalliance", xs @ _*) => MergeStrategy.last
  case PathList("javax", "inject", xs @ _*) => MergeStrategy.last
  case PathList("javax", "servlet", xs @ _*) => MergeStrategy.last
  case PathList("javax", "activation", xs @ _*) => MergeStrategy.last
  case PathList("org", "apache", xs @ _*) => MergeStrategy.last
  case PathList("com", "google", xs @ _*) => MergeStrategy.last
  case PathList("com", "esotericsoftware", xs @ _*) => MergeStrategy.last
  case PathList("com", "codahale", xs @ _*) => MergeStrategy.last
  case PathList("com", "yammer", xs @ _*) => MergeStrategy.last
  case PathList("com", "typesafe", xs @ _*) => MergeStrategy.last
  case PathList("net", "jpountz", xs @ _*) => MergeStrategy.last
  case PathList("org", "slf4j", xs @ _*) => MergeStrategy.last
  case PathList("org", "neo4j", xs @ _*) => MergeStrategy.last
  case "about.html" => MergeStrategy.rename
  case "META-INF/ECLIPSEF.RSA" => MergeStrategy.last
  case "META-INF/mailcap" => MergeStrategy.last
  case "META-INF/mimetypes.default" => MergeStrategy.last
  case "plugin.properties" => MergeStrategy.last
  case "log4j.properties" => MergeStrategy.last
  case x =>
    val oldStrategy = (assemblyMergeStrategy in assembly).value
      oldStrategy(x)
}

Answer 1

重建新 jar 并检查主要 class 位置有效。

无法找到或加载 main class sbt-assembly 可执行 jar

Could not find or load main class sbt-assembly executable jar

scala

jar

sbt

sbt-assembly