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I wanted to give the java fx sdk preview a try and got a bit confused, because there where no downloads for linux.

so i downloaded the macos version without netbeans (the zip file - not the dmg), unpacked it and set some environment variables (JAVAFX_HOME and JFX_HOME pointing to wherever you unpacked the zip file) - and TADA! A working javafx environment even under linux

if you write the code from below into a file called Hello.fx and compile it using

javafxc -d . Hello.fx

and run it using

javafx Hello

This should result in something like this

import javafx.scene.*;
import javafx.scene.paint.*;
import javafx.scene.geometry.*;
import javafx.scene.text.*;
import javafx.scene.effect.*;
import javafx.scene.effect.light.*;

import javafx.ext.swing.*;

SwingFrame {
    title: "Hallo Welt"
    width: 310
    height: 98
    content: Canvas {
      content: Group {
        content: [
          Rectangle {
            x: 10
            y: 10
            width: 280
            height: 50
            arcWidth: 15
            arcHeight: 15
            fill: Color.web("#C0C0C0")
            effect: Lighting {
                light: DistantLight {
                    azimuth: 225
                }
            }
          },
          Text {
            x: 150
            y: 40
            content: "Hello World!"
            font: Font {
              name: "Serif"
              size: 20
              style: FontStyle.BOLD
            }
            fill: Color.WHITE
            horizontalAlignment: HorizontalAlignment.CENTER
          }
        ]
      }
    }
    visible: true
  }