VagueGroovyInGrails.groovy

public class VagueGroovyInGrails {
  // Typical service injection by Grails
  // It's type is...? It's resolved dynamically at runtime
  def someService

  void doSomething() {
    // Call a service method. Does that method exist?
    // Who knows? We don't even know what class type it is at compile time.
    someService.doYourThing();
  }
}