JavaFX binding throws illegal state Exception: not on the thread of Application FX

Hi all

I am updating a label of a task using bindings.

However, when I 'Bind' the label text property with a property of the task, Illegal state exception string is thrown. Saying: this is not not on the thread of JavaFX.

The Exception occurs whenever I try to set the property of the task of the Interior string.

Please do not suggest to use the platform. RunLater(). I want to do this through links as the values I am trying to display in the label (later on) could change too frequently, and I don't want to flood the queue of the thread of the user interface with executable objects.

Please let me know what I'm doing wrong and what I need to change to make it work properly with links. (I'm new to links and concurrency JavaFx API)

Here is my Code.

public class MyTask extends Task<String>{

    MyTask(){
       System.out.println("Task Constructor on Thread "+Thread.currentThread().getName());


    }
    private StringProperty myStringProperty = new SimpleStringProperty(){
        {
            System.out.println("Creating stringProperty on Thread "+Thread.currentThread().getName());
        }
    };
    private final void setFileString(String value) {
        System.out.println("Setting On Thread"+Thread.currentThread().getName());
        myStringProperty.set(value); }
    public final String getFileString() { return myStringProperty.get(); }
    public final StringProperty fileStringProperty() {
        System.out.println("Fetching property On Thread"+Thread.currentThread().getName());
        return myStringProperty; }
    
    @Override
    public String call() throws Exception{
        System.out.println("Task Called on thread "+Thread.currentThread().getName());


       for(int counter=0;counter<100;counter++){
           try{
           setFileString(""+counter);
           }catch(Exception e){
               e.printStackTrace();
           }
           Thread.sleep(100);
           System.out.println("Counter "+counter);
       }
       return "COMPLETED";
    }
}


public class MyService extends Service<String> {


    MyTask myTask;

    public MyService(){
        System.out.println("Service Constructor on Thread "+Thread.currentThread().getName());
        myTask=new MyTask();
    }

    @Override
    public Task createTask(){
        System.out.println("Creating task on Thread "+Thread.currentThread().getName());
        return myTask;
    }

}


public class ServiceAndTaskExperiment extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("Sample.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }
}


public class SampleController implements Initializable {
    @FXML
    private Label label;

    @FXML
    private void handleButtonAction(ActionEvent event) {
        System.out.println("You clicked me!");
        myTestService.start(); //This will throw out exceptions when the button is clicked again, it does not matter
    }

    MyService myTestService=new MyService();
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        label.setText("Hello World!");
        //adding the below Line causes the exception
        label.textProperty().bind(myTestService.myTask.fileStringProperty()); //removing this line removes the exception, ofcourse the label wont update.
    } 
}
//sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>


<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml" fx:controller="serviceandtaskexperiment.SampleController">
    <children>
        <Button layoutX="126" layoutY="90" text="Click Me!" onAction="#handleButtonAction" fx:id="button" />
        <Label layoutX="126" layoutY="120" minHeight="16" minWidth="69" fx:id="label" />
    </children>
</AnchorPane>

And it is the output with links on:

Output: when the link is activated label.textProperty () .bind (myTestService.myTask.fileStringProperty ());

Service on JavaFX Application Thread constructor

Creating string on thread JavaFX Application Thread

Task, Builder on JavaFX Application Thread

Get the property on request ThreadJavaFX wire

You clicked me!

Creating a task on a thread Thread Application JavaFX

Task called threadThread-4

Setting on ThreadThread-4

java.lang.IllegalStateException: not on the application thread FX; currentThread = Thread-4

at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:237)

at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:398)

to javafx.scene.Parent$ 1.onProposedChange(Parent.java:245)

at com.sun.javafx.collections.VetoableObservableList.setAll(VetoableObservableList.java:90)

at com.sun.javafx.collections.ObservableListWrapper.setAll(ObservableListWrapper.java:314)

at com.sun.javafx.scene.control.skin.LabeledSkinBase.updateChildren(LabeledSkinBase.java:602)

at com.sun.javafx.scene.control.skin.LabeledSkinBase.handleControlPropertyChanged(LabeledSkinBase.java:209)

to com.sun.javafx.scene.control.skin.SkinBase$ 3.changed(SkinBase.java:282)

at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:107)

to com.sun.javafx.binding.ExpressionHelper$ SingleChange.fireValueChangedEvent (ExpressionHelper.java:196)

at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)

at javafx.beans.property.StringPropertyBase.fireValueChangedEvent(StringPropertyBase.java:121)

at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:128)

in javafx.beans.property.StringPropertyBase.access$ 100 (StringPropertyBase.java:67)

to javafx.beans.property.StringPropertyBase$ Listener.invalidated (StringPropertyBase.java:236)

to com.sun.javafx.binding.ExpressionHelper$ SingleInvalidation.fireValueChangedEvent (ExpressionHelper.java:155)

at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)

at javafx.beans.property.StringPropertyBase.fireValueChangedEvent(StringPropertyBase.java:121)

at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:128)

at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:161)

at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:67)

to serviceandtaskexperiment. MyTask.setFileString (MyTask.java:24)

to serviceandtaskexperiment. MyTask.call (MyTask.java:36)

to serviceandtaskexperiment. MyTask.call (MyTask.java:11)

to javafx.concurrent.Task$ TaskCallable.call (Task.java:1259)

at java.util.concurrent.FutureTask.run(FutureTask.java:262)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

to java.util.concurrent.ThreadPoolExecutor$ Worker.run (ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:724)

Output with links removed: (label will not be updated)

Service on JavaFX Application Thread constructor

Creating string on thread JavaFX Application Thread

Task, Builder on JavaFX Application Thread

You clicked me!

Creating a task on a thread Thread Application JavaFX

Task called threadThread-4

Setting on ThreadThread-4

Counter 0

Setting on ThreadThread-4

1 meter

Setting on ThreadThread-4

2 meter

Setting on ThreadThread-4

If myStringProperty is bound to the textProperty of etiquette, you can only change it on the Thread of the JavaFX Application. The reason is that change its value will result in a change of the label, and changes of live parts of the graphic scene cannot be performed on the Thread of the JavaFX Application.

Task and Service classes expose a messageProperty you could use here. The Task class has a updateMessage (...) method that changes the value of the message on the Thread of the JavaFX Application property. It also merges calls in order to prevent the flooding of this thread. If you could do the following in your MyTask.call () method:

updateMessage(""+counter);

and then in your controller just do

label.textProperty().bind(myTestService.messageProperty());

If you don't want to use the messageProperty for some reason any (for example you are already using it for something else, or you want to make something similar to a property that is not a string), you must merge the updates yourself. What follows is based on the source code of the task:

public class MyTask extends Task {

     // add in the following:
    private final AtomicReference fileString = new AtomicReference<>();

    private void updateFileString(String text) {
        if (Platform.isFxApplicationThread()) {
            setFileString(text);
        } else {
            if (fileString.getAndSet(text) == null) {
                Platform.runLater(new Runnable() {
                    @Override
                    public void run() {
                        final String text = fileString.getAndSet(null);
                        MyTask.this.setFileString(text);
                    }
                });
            }
        }
    }

   // Now just call updateFileString(...) from your call() method
}

Tags: Java

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