在guice模块中获取运行Play微服务的端口

Question

I'd like to start a play application at a random port (port 0). Each started microservice instance should connect to a service locator (eureka) and tell him his port and host. But how can I retrieve the port of a running play service?

This question was actually asked several times, but the answers did not work for me:

class MyModule @Inject() (configuration: Configuration) extends AbstractModule {
  configuration.getInt("http.port") // returns None
  System.getProperty("http.port") // returns null
}

Answer 1

根据播放文档，这应该起作用：

configuration.get[Int]("play.server.http.port")