Intellij IDEA java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object [英] Intellij IDEA java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object

问题描述

我有以下功能:

def removeLast(list: List[Int]): List[Int] = list match {
  case List() => List()
  case List(x) => List()
  case x :: xs => x :: removeLast(xs)
}

当我定义它并从 sbt 控制台使用它时，一切正常.但是当我在 Intellij IDEA 中创建一个工作表并尝试运行它时，会出现以下异常:

When I define it and use it from the sbt console everything works just fine. But when I create a worksheet in Intellij IDEA and try to run it then the following exception appears:

java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object;在 week5.A$A26$A$A26.removeLast(lists.sc8362409100671270508.tmp:30)在#worksheet#.#worksheet#(lists.sc8362409100671270508.tmp:33)

java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object; at week5.A$A26$A$A26.removeLast(lists.sc8362409100671270508.tmp:30) at #worksheet#.#worksheet#(lists.sc8362409100671270508.tmp:33)

另外，当我将最后一行更改为:

In addition, when I change last line to:

case x :: xs => 1 :: removeLast(xs)}

然后就可以了.

可能是什么问题?

推荐答案

我遇到了这个问题.同意 Andrzej，idea 使用自己的编译器，所以你必须以某种方式禁用它.转到Settings->Scala->Worksheet并取消选中在编译器进程中运行工作表".

I had this issue. Agree with Andrzej, idea uses its own compiler, so you have to disable it somehow. Go to Settings->Scala->Worksheet and uncheck "Run worksheet in the compiler process".

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