Is it possible, with SBT to use a flat directory structure for multimodules? That

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Editorial Team

Asked: June 1, 20262026-06-01T03:23:55+00:00 2026-06-01T03:23:55+00:00

Is it possible, with SBT to use a flat directory structure for multimodules?

That is, instead of having:

- parent
  |- child_a
  |- child_b

to simply have:

- parent
- child_a
- child_b

I have tried the later and configured the parent project/Build.scala with:

lazy val child_a = Project(id = "child_a",
    base = file("../child_a"))

But when doing an sbt command, like sbt package, I get to following error:

[error] java.lang.AssertionError: assertion failed: Directory D:\src\child_a is not contained in build root D:\src\parent

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Editorial Team · Answer 1 · 2026-06-01T03:23:57+00:00

Editorial Team

I don’t think this is possible.

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