使用Akka java API时Kotlintypes推理编译错误

我想在Kotlin程序中使用Akka java API。 当我想为akka设置onComplete回调Future ，我遇到了Kotlin编译器错误，而java等价的工作很好：

 val future: Future = ask(sender, MyActor.Greeting("Saeed"), 5000) future.onComplete(object : OnComplete() { override fun onComplete(failure: Throwable?, success: Object?) { throw UnsupportedOperationException() } }, context.dispatcher()) 

java代码：

 Future future = ask(sender(), new MyActor.Greeting("Saeed"), 5000); future.onComplete(new OnComplete() { public void onComplete(Throwable failure, Object result) { if (failure != null) { System.out.println("We got a failure, handle it here"); } else { System.out.println("result = "+(String) result); } } },context().dispatcher()); 

Kotlin编译器错误：

 Error:(47, 24) Kotlin: Type inference failed: fun  onComplete(p0: scala.Function1<scala.util.Try!, U!>!, p1: scala.concurrent.ExecutionContext!): kotlin.Unit cannot be applied to (,scala.concurrent.ExecutionContextExecutor!) Error:(47, 35) Kotlin: Type mismatch: inferred type is  but scala.Function1<scala.util.Try!, scala.runtime.BoxedUnit!>! was expected 

我把这个项目推给了github 。

Answer 1

那么，错误信息可能有点不清楚，因为很多Scala的东西和 ，但它明确定义的错误点：你的函数应该接受一个Any ，而不是一个Object 。 以下代码编译没有任何问题：

 val future: Future = ask(sender, MyActor.Greeting("Saeed"), 5000) future.onComplete(object : OnComplete() { override fun onComplete(failure: Throwable?, success: Any?) { throw UnsupportedOperationException() } }, context.dispatcher())