CODEWITHSUNDEEP
scalaplayframeworkconfiguration
Ameni Gaaloul
Ameni Gaaloul

Reputation: 43

how to refresh application.conf at runtime

I update a key value in application.conf by setting the environment variable 

play.http.secret.key=${?MY_SECRET_KEY}

But it still loads the previous value.
After a system reboot the change takes effect.
Is there a way to refresh the config file without rebooting?

Upvotes: 2

Views: 1667

Answers (2)

Daniel Hinojosa
Daniel Hinojosa

Reputation: 992

Try the following:

Given in a file called sample1.conf:

a {
   b {
      c = 30
      d = ["Red", "Orange", "Green", "Blue"]
   }
}

If you wish to change a property be sure to change it as system property first and call invalidate caches then load again. This is also what allows you to override on the command line.

System.setProperty("a.b.c", "100")
ConfigFactory.invalidateCaches()
val config = ConfigFactory.load("sample1")
config.getDouble("a.b.c") should be (100.0)

Don't know if this would work in all scenarios. So it may or may not work with your application of choice.

Upvotes: 1

GuilleK
GuilleK

Reputation: 46

AFAIK, there is no Out of the box mechanism to do such thing. As it turns out, when you start Play through the "sbt run" command, it starts in Dev mode, creating two ClassLoaders, one for your code, and the other one for the immutable code, like libraries, dependencies, and the framework code itself. This is done this way as to provide the hot deploy feature, killing and reloading the first CL. Because the application.conf is loaded by Play on start up, I would think that it is loaded within the fixed ClassLoader, hence no reload is possible.

Upvotes: 0

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