Scala 期货和 Await.result()

Question

I expect the following code to result in syncResult containing "string two", but instead, I get the error java.lang.NoClassDefFoundError: Could not initialize class .

import scala.concurrent.{Await, Future}
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration._

def randomFunction1(): Future[String] = {
    Future.successful("string one")
}

def randomFunction2(): Future[String] = {
    Future.successful("string two")
}

val asyncResult: Future[String] = for {
    r1 <- randomFunction1()
    r2 <- randomFunction2()
} yield r2

val syncResult: String = Await.result(
    asyncResult,
    1.second
)

I get similar results with the following.

import scala.concurrent.{Await, Future}
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration._

def randomFunction1(): Future[String] = {
    Future.successful("string one")
}

def randomFunction2(): Future[String] = {
    Future.successful("string two")
}

val asyncResult: Future[String] = randomFunction1().flatMap(
    r1 => {
        randomFunction2()
    }
)

val syncResult: String = Await.result(
    asyncResult,
    1.second
)

I'm using the Scala 2.12.2 interpreter to run this using :paste .

What's wrong with my code?

Answer 1

这似乎是 Scala REPL 的问题。