how to set main class in SBT 0.13 project

Question

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 docu

Answer 1

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

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

Answer 2

Here is how to specify main class

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

Answer 3

If you have multiple main methods in your project you can add the following line to your build.sbt file:

val projectMainClass = "com.saeed.ApplicationMain"

mainClass in (Compile, run) := Some(projectMainClass)

If you want to specify the class that will be added to the manifest when your application is packaged as a JAR file, add this line to your build.sbt file:

mainClass in (Compile, packageBin) := Some(projectMainClass)

You can also specify main class using run-main command in sbt and activator to run:

sbt "run-main com.saeed.ApplicationMain"

or

activator "run-main com.saeed.ApplicationMain"