Getting an error in in JavaFX - javafx

Question

I am trying to test this code but I am encountering problems. I have netbeans with default JavaFX platform.
This example is from this web site: http://onjava.com/pub/a/onjava/2007/07/27/introduction-to-javafx-script.html?page=4
package captureexample1;
import java.io.*;
import javafx.ui.*;
import javafx.ui.canvas.*;
import javafx.ui.filter.*;
import java.awt.Robot;
import java.awt.Rectangle;
import java.awt.image.RenderedImage;
import javax.imageio.ImageIO;
import java.lang.System;
class CaptureExample extends CompositeNode{
attribute lx: Integer;
attribute ly: Integer;
operation CaptureExample();
}
attribute CaptureExample.lx = 0;
attribute CaptureExample.ly = 0;
operation saveCapture(lx_copy:Integer, ly_copy:Integer) {
var robot = new Robot();
var rect = new Rectangle (lx_copy, ly_copy, 50, 50);
var BI=robot.createScreenCapture(rect);
var file = new File(".//capture.jpg");
ImageIO.write((RenderedImage)BI, "jpg", file);
}
function CaptureExample.composeNode() =
Group{
transform: []
content:[ImageView {
transform: []
image: Image { url: ".//app//Sunset.gif" }
cursor: DEFAULT
onMouseClicked: operation(e:CanvasMouseEvent) {
saveCapture(e.source.XOnScreen,e.source.YOnScreen);
}
onMouseMoved: operation(e:CanvasMouseEvent) {
lx = e.x;
ly = e.y;
}
},
Rect{
x: bind lx
y: bind ly
width: 50
height:50
strokeWidth: 1
stroke: black
}]
};
Frame {
centerOnScreen: true
visible: true
height: 230
width: 300
title: "Capture the screen..."
onClose: operation() {System.exit(0);}
content: ScrollPane {
background: white
view: Canvas {
background: black
cursor: DEFAULT
content: CaptureExample
}
}
}

Answer 1

It seems you are mixing JavaFX script and JavaFX2.
JavaFX script (aka JavaFX 1.3) is obsolete, not supported and old.
modern JavaFX 2 uses Java as language instead of FX script. You can see examples here: http://docs.oracle.com/javafx/2/get_started/jfxpub-get_started.htm
If you really want to use JavaFX 1.3:
get older NetBeans, like 6.1
rename you .java file to .fx
But if you just trying to learn JavaFX I really advise you to try JavaFX 2.