gistfile1.sh

# build and run
$ go build -o /dev/null nashorn-javafx.go && gopherjs build nashorn-javafx.go && jjs -fx nashorn-javafx.js

nashorn-javafx.go

package main

import (
    "github.com/gopherjs/gopherjs/js"
)

var java = js.Global.Get("Java")

func main() {
    js.Global.Set("start", start)
}

func start(stage js.Object) {
    stage.Set("title", "Hello, GopherJS")
    WebView := java.Call("type", "javafx.scene.web.WebView")
    webview := WebView.New()
    webview.Call("getEngine").Call("load", "http://gopherjs.org/playground/")
    Scene := java.Call("type", "javafx.scene.Scene")
    scene := Scene.New(webview, 600, 600)
    stage.Call("setScene", scene)
    stage.Call("show")
}