GuiceApplicationLoader configuration error

Question

So, I\'m trying to implement compile time DI with something that looks like this:

package modules

class MyModule extends AbstractModule {
  def configure() {
           


        

Answer 1

Use bindings instead of load:

class MyApplicationLoader extends GuiceApplicationLoader {
  override protected def builder(context: ApplicationLoader.Context): GuiceApplicationBuilder = {
  initialBuilder
    .in(context.environment)
    .loadConfig(context.initialConfiguration)
    .overrides(overrides(context): _*)
    .bindings(new MyModule)
  }
}

Answer 2

I'm not sure what you are trying to achieve here, but that's not how compile time dependency injection works. Guice does its magic at runtime. However, if you want to have your dependencies ready as soon as the application starts, use eager loading. Guice already provides all the tools needed:

MyModule

class MyModule extends AbstractModule {
  def configure() {
    bind(classOf[MyT]).to(classOf[MyTImpl]).asEagerSingleton()
  }
}

application.conf

play.modules.enabled += "modules.MyModule"

Because MyTImpl will be loaded as a singleton, it must have no instance bound data. Think of an object in scala terms. Always the exact same instance of MyTImpl will be injected.