how to set main class in SBT 0.13 project

2018-06-14 23:47:05

Could you guys please explain to me how to set main class in SBT project ? I'm trying to use version 0.13.

My directory structure is very simple (unlike SBT's documentation). In the root folder I have build.sbt with following content

name := "sbt_test"

version := "1.0"

scalaVersion := "2.10.1-local"

autoScalaLibrary := false

scalaHome := Some(file("/Program Files (x86)/scala/"))

mainClass := Some("Hi")

libraryDependencies ++= Seq(
    "org.scalatest" % "scalatest_2.10" % "2.0.M5b" % "test"
)

EclipseKeys.withSource := true

And I have subfolder project with single file Hi.scala which contains following code

object Hi {
  def main(args: Array[String]) = println("Hi!")
}

I'm able to compile it by calling sbt compile but sbt run returns

The system cannot find the file C:workexternalssbtbinsbtconfig.txt.
[info] Loading project definition from C:worktest_projectssbt_testproject
[info] Set current project to sbt_test (in build file:/C:/work/test_projects/sbt_test/)
java.lang.RuntimeException: No main class detected.
        at scala.sys.package$.error(package.scala:27)
[trace] Stack trace suppressed: run last compile:run for the full output.
[error] (compile:run) No main class detected.
[error] Total time: 0 s, completed Apr 8, 2013 6:14:41 PM

PS.

I'm shocked that after reading SBT's documentation and 15 similar questions on StackOverflow I couldn't make SBT project run. It's basic functionality which should be brain-dead simple and clear in first 10 seconds of looking at SBT's web-site.

PS2.

And I'd like to ask Typesafe employees to improve documentation of their product instead of downvoting questions of people who are investing significant time in switching to new platform.

您需要将应用程序的源代码放在src/main/scala/ ， project/用于构建定义代码。

Try to use an object and extend it from App instead of using class

object Main extends App {
  println("Hello from main scala object")
}

because you need to run main method neither main class

以下是如何指定主类

mainClass in (Compile,run) := Some("my.fully.qualified.MainClassName")

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