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scalasbtsbt-assembly

How do I do a multi-project build that outputs a jar for every subproject?

I have a project, called Main, and 2 subprojects: One, Two. Here's what my build.sbt looks like:

name := "Main"

version := "0.1"

scalaVersion := "2.12.7"

lazy val root = Project(id = "root", base = file("."))  aggregate(one, two) dependsOn(one, two)
lazy val one = Project(id = "one", base = file("One"))
lazy val two = Project(id = "two", base = file("Two"))

when I run sbt compile package I only get a .jar for Main (Main.jar), but I want to get a .jar for every subproject and not Main: One.jar, Two.jar.

How do I achieve this?

Also I have no idea what aggregate(one, two) dependsOn(one, two) means, do I even need that?

I also want every subproject to build into a fat jar with sbt-assembly.

Solution

  • It actually works now. I was encountering this behavior, where sbt was telling me that my assembly was not packaged, because it was up-to-date, but then I started doing sbt clean assembly, instead of sbt assembly and it works like a charm now.