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Root project aggregation broken by plugin overriding `extraProjects` #4185

dotta opened this Issue Jun 8, 2018 · 0 comments


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dotta commented Jun 8, 2018


A minimized project to reproduce the issue is included in the attached zip, but here are the steps:

  1. Create an autoplugin that adds a project to the build via the extraProjects hook:
import sbt._

object MyPlugin extends AutoPlugin {
  override def requires: Plugins = plugins.JvmPlugin
  override def trigger: PluginTrigger = allRequirements

  private val myExtraProject = Project("my-extra-project", file("target"))
  override def extraProjects: Seq[Project] = super.extraProjects ++ Seq(myExtraProject)
  1. Create a build.sbt file:
// build.sbt
lazy val a = (project in file("a"))
  1. Create a Foo.scala file defined inside a/src/main/scala, e.g.,:
// a/src/main/scala/Foo.scala
class Foo


Execute sbt compile and you'll see no classfile is generated:

$ sbt compile
[info] Done updating.
[success] Total time: 0 s, completed Jun 8, 2018 5:54:52 PM
$ ls -l a/
total 0
drwxr-xr-x  3 mirco  staff  102 Jun  8 17:47 src/

The problem is the aggregation of the automatically created root project, which is aggregating on the project created by the plugin (i.e., my-extra-project) instead of aggregating the projects in the build.


A target folder inside the a project should exist, and a Foo.class should be in there. Said otherwise, root project aggregation should work as usual.


sbt version: 1.1.5 (but the same happens with 0.13.15)

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