in my `application.conf` i have ```port = ${PORT}``` this works fine on heroku and when this is set...

# ktor

[Nikky]

in my application.conf i have

port = ${PORT}

this works fine on heroku and when this is set in the environment, but can i somehow set eg. 8080 as fallback ?
could not find how to do that in the HOCON spec

[zpearce]

it's a two line thing:

port = 8080
port = ${?PORT}

[Nikky]

oh thats almost too easy

[Nikky]

but that seemed to not work.. it still crashes:

Exception in thread "main" com.typesafe.config.ConfigException$UnresolvedSubstitution: application.conf @ file:/home/nikky/dev/pentagame/backend/build/resources/main/application.conf: 4: Could not resolve substitution to a value: ${PORT}

[zpearce]

you need the question mark

[zpearce]

https://github.com/lightbend/config#optional-system-or-env-variable-overrides

[Nikky]

oh