scala - 一个最简单的scalafx例子无法编译

Question

我正在用一个最简单的例子尝试scalafx，但它无法编译，错误如下:

Error:scalac: bad symbolic reference to javafx.stage.PopupWindow.AnchorLocation encountered in class file 'StageIncludes.class'. Cannot access type AnchorLocation in object javafx.stage.PopupWindow. The current classpath may be missing a definition for javafx.stage.PopupWindow.AnchorLocation, or StageIncludes.class may have been compiled against a version that's incompatible with the one found on the current classpath.

我用谷歌搜索，发现有人说我们需要将 jfxrt.jar 添加到类路径，但这仍然不起作用。

我的代码:

build.sbt

name := "ColaBlog"

version := "0.1.0"

scalaVersion := "2.11.0"

libraryDependencies ++= List(
  "org.scalafx" % "scalafx_2.11" % "8.0.0-R4"
)

unmanagedJars in Compile += Attributed.blank(
  file(scala.util.Properties.javaHome) / "lib" / "jfxrt.jar")

fork in run := true

App.scala

import scalafx.Includes._
import scalafx.application.JFXApp
import scalafx.scene.Scene
import scalafx.scene.paint.Color
import scalafx.scene.shape.Rectangle

object App extends JFXApp {

  stage = new JFXApp.PrimaryStage {
    title = "Hello World"
    width = 600
    height = 450
    scene = new Scene {
      fill = Color.LIGHTGREEN
      content = Set(new Rectangle {
        x = 25
        y = 40
        width = 100
        height = 100
        fill <== when(hover) choose Color.GREEN otherwise Color.RED
      })
    }
  }
}

仅此而已。

Answer 1

这在 Java 8 JVM 上可以正常工作。可能的问题是您正在安装 Java 7。

通过这些release notes ScalaFX 有两个并行版本:

• v.1.0.0 - 支持 JavaFX 2 和 Java 7 (SFX-1)
• v.8.0.0 - 支持 JavaFX 8 和 Java 8 (SFX-8)

更新 Java，或使用其他版本。