java - ProgressBar doesn't work with a fxml file and a controller -

so used link set progress bar , worked fine when ran code.

however, setup have, can't seem progressbar update... progressbar.getprogress() gets right progress ui isn't updated. here's code far:

main.java

public class main extends application {     @override     public void start(stage primarystage) {         try {             fxmlloader loader = new fxmlloader(main.class.getresource("progressbarlayout.fxml"));             anchorpane root = (anchorpane) loader.load();             scene scene = new scene(root);             primarystage.setscene(scene);             primarystage.show();         } catch(exception e) {             e.printstacktrace();         }     }      public static void main(string[] args) {         launch(args);     } } 

progressbarcontroller.java

public class progressbarcontroller {     private task copyworker;      @fxml     private progressbar progressbar;      @fxml     private void onbuttonclick() {         progressbar = new progressbar(0);          progressbar.setprogress(0);          copyworker = createworker();           progressbar.progressproperty().unbind();          progressbar.progressproperty().bind(copyworker.progressproperty());           new thread(copyworker).start();     }       public task createworker() {         return new task() {             @override             protected object call() throws exception {                 (int = 0; < 10; i++) {                     thread.sleep(2000);                     updatemessage("2000 milliseconds");                     updateprogress(i + 1, 10);                      system.out.println(progressbar.getprogress());                 }                 return true;             }         };     } } 

progressbarlayout.fxml

<?xml version="1.0" encoding="utf-8"?>  <?import java.lang.*?> <?import javafx.scene.control.*?> <?import javafx.scene.layout.*?> <?import javafx.scene.layout.anchorpane?>  <anchorpane prefheight="257.0" prefwidth="434.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.progressbarcontroller">    <children>       <progressbar fx:id="progressbar" layoutx="54.0" layouty="103.0" prefheight="51.0" prefwidth="326.0" progress="0.0" />       <button layoutx="201.0" layouty="182.0" mnemonicparsing="false" onaction="#onbuttonclick" text="ok" />    </children> </anchorpane> 

in controller :

    progressbar = new progressbar(0); 

this mean create new instance of progressbar , not use progressbar fxml anymore. remove line, should works