为什么在Scala REPL中跟随跟随会引发异常?

时间:2018-12-26 11:05:03

标签: scala scala-repl

为什么下面的代码的最后一行在scala REPL中引发错误?

import scala.concurrent._
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext.Implicits.global

// This is okay
val futureInt = Future[Int] { 42 }
val v1 = Await.result(futureInt, 1.second)

// This throw error: java.lang.NoClassDefFoundError: Could not initialize class $line8.$read$$iw$$iw$$iw$$iw$$iw$$iw$
val v2 = Await.result(Future[Int]{ 42 }, 1.second)

但是当我创建一个主类并执行相同的代码时,它可以正常工作:

import scala.concurrent._
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext.Implicits.global

object Main {
  def main(args: Array[String]): Unit = {
    val futureInt = Future[Int] { 42 }
    val v1 = Await.result(futureInt, 1.second)
    val v2 = Await.result(Future[Int] { 44 }, 1.second)
    println(s"v1=$v1, v2=$v2 ")
  }
}
  

输出:

     

v1 = 42,v2 = 44

1 个答案:

答案 0 :(得分:1)

此bug(包括您的确切来源)已在针对scala的此bug中进行跟踪:

https://github.com/scala/bug/issues/9076#issuecomment-292435527