Error: "Not found: millbuild"

[sergey-morenets]

Hi

We tried to migrate our multi-module Maven project to Mill and the migration was basically successful. However when we tried to build a project:

mill assembly

we got an error:

compile compiling 33 Scala sources to out/mill-build/compile.dest/classes ...
build.mill.yaml-68] [error] admin/package.mill.yaml:14:24
build.mill.yaml-68] trait package_ extends millbuild.ProjectBaseModule, mill.javalib.errorprone.ErrorProneModule, AutoOverride[_root_.mill.T[?]] {
build.mill.yaml-68]                        ^^^^^^^^^
build.mill.yaml-68] Not found: millbuild

I guess the error comes the first line of package.mill.yaml for this module:

extends: [millbuild.ProjectBaseModule, mill.javalib.errorprone.ErrorProneModule]

Because only there millbuild namespace is used.

[sergey-morenets]

Another question is why does Mill use millbuild.ProjectBaseModule here and not MavenModule, for example?

[sergey-morenets]

After I replaced millbuild.ProjectBaseModule with MavenModule I got another error:

compile compiling 33 Scala sources to out/mill-build/compile.dest/classes ...
build.mill.yaml-68] [error] admin/package.mill.yaml:20:23
build.mill.yaml-68]   object test extends ProjectBaseTests, AutoOverride[_root_.mill.T[?]] {
build.mill.yaml-68]                       ^^^^^^^^^^^^^^^^
build.mill.yaml-68] Not found: type ProjectBaseTests

Here's part of package.mill.yaml where ProjectBaseTests is referenced:

object test:
  extends: ProjectBaseTests
  mvnDeps:

[lihaoyi]

@sergey-morenets can you help minimize a repro? I can't tell what is going wrong based on your description

[sergey-morenets]

Hi @lihaoyi

Yes, I will try to prepare minimal example, for reproduction but would like to say that last error can be fixed by using this block of code for tests:

object test:
  extends: TestModule.Junit5