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我注意到，当尝试使用 play-ws（sbt 程序集）为 playframework 2.7 构建 fat jara 时，会发生依赖项重复。我收到很多与 javax.activation-api 和 shaded-asynchttpclient 有关的错误，例如

[error] deduplicate: different file contents found in the following:
[error] /home/user/.cache/coursier/v1/https/repo1.maven.org/maven2/javax/activation/javax.activation-api/1.2.0/javax.activation-api-1.2.0.jar:javax/activation/UnsupportedDataTypeException.class
[error] /home/user/.cache/coursier/v1/https/repo1.maven.org/maven2/com/typesafe/play/shaded-asynchttpclient/2.0.6/shaded-asynchttpclient-2.0.6.jar:javax/activation/UnsupportedDataTypeException.class

问题原来是 play-ws 没有正确执行 sbt 组装。我的代码中唯一明确使用 javax 的地方是依赖注入。改用 guice 会得到相同的结果。这是我的 build.sbt （基于https://www.playframework.com/documentation/2.7.x/Deploying）

name := "My-App"
version := "1.0"
scalaVersion := "2.11.12"

lazy val root = (project in file(".")).enablePlugins(PlayScala)
scalaSource in ThisScope := baseDirectory.value
mainClass in assembly := Some("play.core.server.ProdServerStart")
fullClasspath in assembly += Attributed.blank(PlayKeys.playPackageAssets.value)

libraryDependencies ++= Seq(
  ws,
  specs2 % Test,
  "com.typesafe.play" %% "play-json" % "2.7.4",
  "com.typesafe.play" %% "play-slick" % "4.0.2",
  "com.typesafe.play" %% "play-slick-evolutions" % "4.0.2",
  "com.typesafe" % "config" % "1.4.0",
  "org.mindrot" % "jbcrypt" % "0.4",
  "mysql" % "mysql-connector-java" % "8.0.17",
  "org.mindrot" % "jbcrypt" % "0.4",
  "com.iheart" %% "ficus" % "1.4.7",
  "com.typesafe.scala-logging" % "scala-logging_2.11" % "3.9.0"
)

assemblyMergeStrategy in assembly := {
  case manifest if manifest.contains("MANIFEST.MF") =>
    // We don't need manifest files since sbt-assembly will create
    // one with the given settings
    MergeStrategy.discard
  case referenceOverrides if referenceOverrides.contains("reference-overrides.conf") =>
    // Keep the content for all reference-overrides.conf files
    MergeStrategy.concat
  case x =>
    // For all the other files, use the default sbt-assembly merge strategy
    val oldStrategy = (assemblyMergeStrategy in assembly).value
    oldStrategy(x)
}
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