Is there any way to substitute environment variables in playframework's application.conf?

Question

Is there any way to use environment variables in the play! application.conf file? Something like this:

%prod.db.url=${env.DATABASE_JDBC_URL}
%prod.db.driver=org.postgresql.Driver
%prod.jpa.ddl=validate

I don't want to hardcode the URL in my application.conf because it contains credentials that the developer should not have access to.

Answer 1

All variables within ${} are resolved using the following sources:

• ${application.path} equivalent to Play.applicationPath.getAbsolutePath()
• ${play.path} equivalent to Play.frameworkPath.getAbsolutePath()
• any other comes from System.getProperty.

So you could add these as -Dkey=name parameters when launching Play! with your secret credentials specific to your environment.