如何聲明play json依賴關系？

Question

我的build.sbt文件（sbt版本是0.13.8 ）：

lazy val commonSettings = Seq(
  version := "1.0.0",
  scalaVersion := "2.11.6"
)

resolvers += "Typesafe Repo" at "http://repo.typesafe.com/typesafe/releases/"

lazy val root = (project in file(".")).
  settings(commonSettings: _*).
  settings(
    name := "myapp",
    libraryDependencies ++= Seq(
      "com.typesafe.play" % "play-json" % "2.3.4",
      "org.scalatest" % "scalatest_2.11" % "2.2.4" % "test",
      "junit" % "junit" % "4.12" % "test"
    )
  )

scalacOptions ++= Seq("-unchecked", "-feature", "-deprecation")

嘗試編譯我的項目時出現此錯誤：

[trace] Stack trace suppressed: run last *:update for the full output.
[error] (*:update) sbt.ResolveException: unresolved dependency: com.typesafe.play#play-json_2.11;2.3.4: not found
[error] Total time: 0 s, completed Apr 17, 2015 5:59:28 PM

我如何為我的scala 2.11.6獲取這個play-json庫？

Answer 1

您需要告訴sbt應該使用哪個scala版本。

您可以明確：

"com.typesafe.play" % "play-json_2.11" % "2.3.4",

或者按如下方式使用%% （ sbt doc ）告訴sbt使用scalaVersion ：

"com.typesafe.play" %% "play-json" % "2.3.4",

Answer 2

您可以在此處查看com.typesafe.play的所有play-json版本。 他們沒有2.3.4版本； 嘗試改用2.4.0-M3 。

"com.typesafe.play" %% "play-json" % "2.4.0-M3"

注意%%的兩倍，因此可以正確使用scalaVersion來解決依賴關系。