找不到或加载主类 sbt 程序集可执行 jar

Question

我已经定义了项目依赖项并为它们合并策略，以使用 sbt 程序集插件生成 jar 文件。Alos，未来罐子中的主要类也被定义。创建 jar 文件并尝试使用 bash 脚本运行它后，出现错误：

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

Main在 src/main/scala/benchmarks/Main 中，它是一个带有 main 方法的对象。这个项目可能有什么问题？

这是我的 bash 脚本：

#!/usr/bin/env bash
java -cp "target/scala-2.11/benchmarking.jar" benchmarks.Main $1 $2

具有定义的依赖项的 build.sbt：

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 并检查主类位置有效。