Sbt 为什么会出现错误；无效的命令：程序集合并策略"；？

我有以下

build.sbt

文件

import AssemblyKeys._

name := "approxstrmatch"

version := "1.0"

scalaVersion := "2.10.4"

libraryDependencies+="org.apache.spark" %% "spark-core" % "1.0.0"

resolvers += "AkkaRepository" at "http://repo.akka.io/releases/"

// My merge strategy is specified here.

lazy val app = Project("approxstrmatch", file("approxstrmatch"),
    settings = buildSettings ++ assemblySettings ++ Seq(
    mergeStrategy in assembly <<= (mergeStrategy in assembly) { (old) =>
    {
        case PathList("javax", "servlet", xs @ _*)         => MergeStrategy.first
        case PathList("javax", "transaction", xs @ _*)     => MergeStrategy.first
        case PathList("javax", "mail", xs @ _*)     => MergeStrategy.first
        case PathList("javax", "activation", xs @ _*)     => MergeStrategy.first
        case PathList(ps @ _*) if ps.last endsWith ".html" => MergeStrategy.first
        case "application.conf" => MergeStrategy.concat
        case "unwanted.txt"     => MergeStrategy.discard
        case x => old(x)
        }
    })
  )

mainClass in assembly := Some("approxstrmatch.JaccardScore")
// jarName in assembly := "approstrmatch.jar"

---

我的理解告诉我插件中没有

汇编合并策略

任务（我只能怀疑你在构建中使用了该插件）

---

执行

assembly

，如中所述，这是“一个非常棒的新程序集任务，它将编译您的项目，运行您的测试，然后将您的类文件和所有依赖项打包到一个JAR文件中”。

有一个名为

assemblymergetstrategy

（又称

assemblymmergestrategy

）的设置。只是你不会直接使用它。sbt assembly使用它的方式适用于

assembly

任务：

---

mergeStrategy in assembly在您的构建中添加
assembly设置
。sbt将有助于
您的
项目/插件是什么。sbt
？我怀疑您使用了sbt assembly，需要您的确认。有一个名为
assembly merge strategy
-这是正确的，但OP说“当我执行以下命令时sbt assembly merge strategy”，因此得到了答案。
approxstrmatch]$ sbt assembly-merge-strategy
[info] Loading project definition from /apps/sameert/software/approxstrmatch/project
[info] Set current project to approxstrmatch (in buildfile:/apps/sameert/software/approxstrmatch/)
[error] Not a valid command: assembly-merge-strategy
[error] No such setting/task

$ sbt assembly::assemblyMergeStrategy
[info] blabla other things...
[info] <function1>