sbt multiple native packages

Question

So using Scala Play Framework. I have a single codebase but need to launch it 2 ways. One way will launch with Play Netty as the main class, and run a webserver. A second way will run my own main class and do different things.

If I do play dist (https://www.playframework.com/documentation/2.3.x/ProductionDist)

It ends up using the sbt-native plugin, and make a new zip. Inside that zip is a script that calls java with a mainclass of Netty. This is ultimately coming from

  mainClass in (Compile, run) := Some("play.core.server.NettyServer"),

inside of PlaySettings.scala.

I want to keep all of this, but add a second artifact to dist.. that has the only different of a different main class.

I started trying to make subprojects.. but not sure this is what I really even want. Something like:

lazy val root = Project(
  id = "root",
  base = file("."),
  librar
  aggregate = Seq(web, backend)

).dependsOn(web, worker)

lazy val web = Project(
  id = "web",
  base = file("."),
  settings = packageArchetype.java_server ++ Seq(
    name := "web",
    mainClass in Compile := Some("play.core.server.NettyServer")
  )
).enablePlugins(PlayScala)

lazy val backend= Project(
  id = "backend",
  base = file("."),
  settings = packageArchetype.java_server ++ Seq(
    name := "backend",
    mainClass in Compile := Some("com.foobar.BackendMain")
  )
)

But I only end up with a single artifact still. What other options are there?

I could hack up bash-template and add mainClass as a parameter and pass it through to the launch script...

Answer 1

You could use one main class as a default one and pass -main you.another.class.Name parameter to bash script to run another main class.