找不到MergeStrategy

Question

我是Scala的新手，我正在尝试运行sbt。我的build.sbt看起来像这样

name := "myFile"

version := "0.1"

scalaVersion := "2.11.12"

libraryDependencies += "org.apache.spark" %% "spark-core" % "2.4.0" %"provided"

libraryDependencies += "org.apache.spark" %% "spark-sql" % "2.4.0" % "provided"

libraryDependencies += "org.apache.spark" %% "spark-mllib" % "2.4.0" % "provided"

libraryDependencies+="org.apache.spark" %% "spark-streaming" % "2.4.0" % "provided"

libraryDependencies += "org.apache.spark" %% "spark-streaming-kafka" % "1.6.3"

mergeStrategy in assembly := {
  case m if m.toLowerCase.endsWith("manifest.mf")          => MergeStrategy.discard
  case m if m.toLowerCase.matches("meta-inf.*\\.sf$")      => MergeStrategy.discard
  case "log4j.properties"                                  => MergeStrategy.discard
  case m if m.toLowerCase.startsWith("meta-inf/services/") => MergeStrategy.filterDistinctLines
  case "reference.conf"                                    => MergeStrategy.concat
  case _                                                   => MergeStrategy.first
}

然而，当我尝试运行命令"sbt“时，我得到了以下错误：

/home/myFolder/build.sbt:17: error: not found: value mergeStrategy
mergeStrategy in assembly := {
^
/home/myFolder/build.sbt:17: error: not found: value assembly
mergeStrategy in assembly := {
                 ^
/home/myFolder/build.sbt:18: error: not found: value MergeStrategy
  case m if m.toLowerCase.endsWith("manifest.mf")          => MergeStrategy.discard
                                                              ^
/home/myFolder/build.sbt:19: error: not found: value MergeStrategy
  case m if m.toLowerCase.matches("meta-inf.*\\.sf$")      => MergeStrategy.discard
                                                              ^
/home/myFolder/build.sbt:20: error: not found: value MergeStrategy
  case "log4j.properties"                                  => MergeStrategy.discard
                                                              ^
/home/myFolder/build.sbt:21: error: not found: value MergeStrategy
  case m if m.toLowerCase.startsWith("meta-inf/services/") => MergeStrategy.filterDistinctLines
                                                              ^
/home/myFolder/build.sbt:22: error: not found: value MergeStrategy
  case "reference.conf"                                    => MergeStrategy.concat
                                                              ^
/home/myFolder/build.sbt:23: error: not found: value MergeStrategy
  case _                                                   => MergeStrategy.first

你能告诉我我哪里做错了吗？

Answer 1

我在项目中缺少sbt.assembly文件。