steps

Given a hello world application that reads out an environment variable and prints it out:

@main def Main(args: String*): Unit =
  println(System.getenv("FOO"))

Then run:

FOO=BAR sbtn run

problems

I see null.

expectations

I see BAR

notes

When I run:

FOO=BAR bloop run my-project

I correctly see BAR

In fact the sbtn behavior is flaky. It depends on how the server was started. If the server was not running to begin with, then yes

FOO=BAR sbtn run

will indeed print out BAR and the subsequent requests as well. However as soon as we change it to

FOO=NOT_BAR sbtn run

we will keep seeing the incorrect BAR.

original report

I'm not sure whether it's an issue or a feature request. I already created a feature request here: https://discuss.lightbend.com/t/feature-request-sbtn-should-reevaluate-env-variables/9908 but haven't heard anything in over 2 weeks so I'm opening an issue here as well.