JavaFx2.x : extends Path - path

Question

The code below perform a freehand draw, my problem is that this class compile under Linux but I get error in WindowsXP.
Here is the code
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.input.ContextMenuEvent;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Path;
import javafx.scene.shape.PathElement;
public class Freehand {
private Group group ;
private FreeHandDrawPath freehandDraw;
public Freehand(ObservableList<PathElement> _initFreehand) {
this.freehandDraw = new FreeHandDrawPath(_initFreehand);
this.group = new Group();
group.getChildren().add(freehandDraw);
group.addEventHandler(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>() {
#Override
public void handle(final KeyEvent keyEvent) {
if (keyEvent.getCode() == KeyCode.DELETE ) {
group.getChildren().removeAll(freehandDraw);
}
}
});
}
class FreeHandDrawPath extends Path {
double x, y;
final ContextMenu contextMenu = new ContextMenu();
final MenuItem itemDelete = new MenuItem("Delete");
FreeHandDrawPath (ObservableList<PathElement> _initFreehand) {
super(_initFreehand);
setStroke(Color.BLACK);
itemDelete.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
group.getChildren().removeAll(freehandDraw);
//System.out.println("Delete");
}
});
contextMenu.getItems().addAll(itemDelete);
this.addEventHandler(MouseEvent.MOUSE_ENTERED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
// just to show that the line is selected
x = event.getX();
y = event.getY();
setStroke(Color.RED);
setStrokeWidth(getStrokeWidth()+4);
group.requestFocus();
event.consume();
}
});
this.addEventHandler(MouseEvent.MOUSE_EXITED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
setStroke(Color.BLACK);
setStrokeWidth(getStrokeWidth()-4);
event.consume();
}
});
this.addEventHandler(MouseEvent.MOUSE_PRESSED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
if (event.isSecondaryButtonDown()){
setOnContextMenuRequested(
new EventHandler<ContextMenuEvent>() {
#Override
public void handle(ContextMenuEvent event) {
//contextMenu.show(l, Side.RIGHT, 0, 0);
contextMenu.show((Path) event.getSource(), event.getScreenX() + 1, event.getScreenY());
//System.out.println("Hello World!");
}
});
}
event.consume();
}
});
}
}
public Node view() {
return group ;
}
}
Why do I get such error?
Thanks.