Running code when Play starts

Simple snippet that runs during Play 2.5.X initialization. Add your code to the initialize method below:

import javax.inject.{Inject, Singleton}

import com.google.inject.AbstractModule
import play.api.inject.ApplicationLifecycle

class Module extends AbstractModule {
  def configure(): Unit = bind(classOf[SystemGlobal]).asEagerSingleton()
}

@Singleton
class SystemGlobal @Inject()(appLifecycle: ApplicationLifecycle) {
  def initialize(): Unit = {

    println("Hello!")

  }

  initialize()
}

The Module class needs to be in your root package. If you create it anywhere else you have to register the class in application.conf.

You can see slightly more complex example here with a stop hook that runs on application exit. The Play website also has good documentation about replacing the old Global object functionality with dependency injection.