如何强制 SBT 使用 Java 8? [英] How to force SBT to use Java 8?

问题描述

如何强制 SBT 编译为 Java 8 类文件.我添加了 scalacOptions += "-target:jvm-1.8" 但它给出了以下错误消息:

How can I force SBT to compile to Java 8 class files. I added scalacOptions += "-target:jvm-1.8" but it gives the following error message:

[error] 'jvm-1.8' is not a valid choice for '-target'
[error] bad option: '-target:jvm-1.8'
[error] (compile:compile) Compilation failed

我使用的是 SBT 版本 0.15.5.

I am using SBT version 0.15.5.

我知道我正在使用 Java 8 进行编译，因为我将它添加到 build.sbt，但我仍然想知道为什么 scalacOptions 失败，我不知道 scalac 产生什么输出.

I know I am using Java 8 to compile as I added this to build.sbt, but I still wonder why the scalacOptions fails and I don't know what output the scalac produces.

initialize := {
  val _ = initialize.value
  if (sys.props("java.specification.version") != "1.8")
    sys.error("Java 8 is required for this project.")
}

推荐答案

您的 build.sbt 文件需要以下内容.

You need the following on your build.sbt file.

javacOptions ++= Seq("-source", "1.8", "-target", "1.8", "-Xlint")

initialize := {
  val _ = initialize.value
  val javaVersion = sys.props("java.specification.version")
  if (javaVersion != "1.8")
    sys.error("Java 1.8 is required for this project. Found " + javaVersion + " instead")
}

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