Play framework overriding `application.conf` values based on environment

Question

Play 2.6.x Scala

I have a default application.conf within the folder {project}/conf/ but I\'d like to override some values depending on the env

Answer 1

This works if you provide the command line argument first

sbt -Dconfig.resource=qa.conf run

Answer 2

Your question is about HOCON, in case you did not realize it.

Without seeing your application.conf I can only provide a generic answer. Here is an example of providing a default value for akka.log-config-on-start, which will be overridden by a Java system property or an environment variable called CONFIG_DUMP, if defined:

akka {
  log-config-on-start = false
  log-config-on-start = ${?CONFIG_DUMP}
}

This feature of HOCON is documented here.