Develop Reference

Window not showing up on Mac JAVA

package sample;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
public class Main extends Application {
Button button;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage stage) throws Exception {
stage.setTitle("GAME");
button = new Button();
button.setText("CLICK HERE");
StackPane layout = new StackPane();
layout.getChildren().add(button);
Scene scene = new Scene(layout, 300, 250);
stage.setScene(scene);
stage.show();
}
}
Trying to run but the window won't show up, any thoughts on how to fix. I've gone through other posts but no luck. By the way, I'm using IntelliJ. Just started learning JavaFX.

This is in my .bash_profile:
export PATH_TO_FX=/usr/local/bin/javafx-sdk-14/lib
alias javafxc="javac --module-path ${PATH_TO_FX} --add-modules=javafx.controls,javafx.fxml,javafx.media,javafx.web,javafx.swing"
alias javafx="java --module-path ${PATH_TO_FX} --add-modules=javafx.controls,javafx.fxml,javafx.media,javafx.web,javafx.swing"
To compile:
javafxc Main.java
To run:
javafx Main

JavaFX Stage not visible

I'm trying to write the simplest code to start learning how JavaFX works. Here is my code:
package app;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class mainClass extends Application{
Stage primaryStage;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage stage) throws Exception {
primaryStage = stage;
StackPane layout = new StackPane();
Scene scene = new Scene(layout, 300, 300);
primaryStage.setScene(scene);
primaryStage.show();
}
}
It should just show an empty window. My compilator gives no errors, but nothing shows up, even if I can see my program running in my dock. How is this possible? I'm sure I'm missing some stupid simple thing, but I cannot figure out what it is.

I cannot seem to change scenes in javafx

So I'm trying to simply change between two scenes in javafx, but I've come into this re-occurring problem that I can't seem to fix. It is demonstrated in the following code:
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.Group;
import javafx.scene.paint.Color;
public class TestApplication extends Application
{
private Stage stage;
private Scene scene, scene2;
public void start(Stage s)
{
scene=new Scene(new Group());
scene2=new Scene(new Group());
scene.setFill(Color.GREEN);
scene2.setFill(Color.ORANGE);
scene.setOnMouseClicked(e-> changeScene(scene2));
scene2.setOnMouseClicked(e-> changeScene(scene));
stage=s;
s.setScene(scene);
s.show();
}
public void changeScene(Scene nex)
{
stage.setScene(nex);
System.out.println("here");
}
public static void main(String[] args)
{
launch(args);
}
}
Am I doing something wrong? How can I fix this?

What's going wrong
You are not placing anything in the scenes (just an empty group). By default scenes are (usually) going to size to the preferred size of their contained content. As your scenes have no content of any size, then the scenes shouldn't really have any size. I think the fact that the first scene even shows up is a bit of a quirk of the JavaFX system where it seems to set some default size to the initial scene when it can't work out any preferred size for the scene (just so that the initial window shows up).
How to fix it
To fix it, put some content in the enclosed scenes (and/or set the initial scene size in your scene constructors).
import javafx.application.Application;
import javafx.scene.control.Label;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.Group;
import javafx.scene.paint.Color;
public class TestApplication extends Application {
private Stage stage;
private Scene scene, scene2;
public void start(Stage s) {
scene = new Scene(new Group(new Label("1")), 200, 150);
scene2 = new Scene(new Group(new Label("2")), 200, 150);
scene.setFill(Color.GREEN);
scene2.setFill(Color.ORANGE);
scene.setOnMouseClicked(e -> changeScene(scene2));
scene2.setOnMouseClicked(e -> changeScene(scene));
stage = s;
s.setScene(scene);
s.show();
}
private void changeScene(Scene nex) {
stage.setScene(nex);
}
public static void main(String[] args) {
launch(args);
}
}

JavaFX 8: Blank scene after monitor out of standby

I'm having a weird issue with JavaFX (jdk8, build 117): once the monitor resumes from standby the JavaFX stage/scene is blank.
I've tried minimizing/resizing the window but the contents are no longer displayed. I'm using a simple scene with a StackPane.
root = new StackPane();
root.setBackground(null);
scene = new Scene(root, Color.BLACK);
stage.setScene(scene);
ProgressIndicator piLoader = new ProgressIndicator();
piLoader.setMaxSize(32d, 32d);
root.getChildren().add(piLoader);
stage.show();
I've tried searching for a known bug or a previous report but could not find any.

JDK8 is still very much in flux & marked as an early access release, so issues like this should be expected. I've just tested it on JDK8 built b121 (Win8 64bit & Ubuntu 13.10 64bit) and it appears to be fine.
Update your JDK version to the latest & see if that resolves the issue for you.
UPDATE: Here's a full stock-standard example that works without problem for me, monitor goes into sleep mode & comes back without any display issues. 'Sleep mode' is the only option Windows 8 is giving me, so not 'Standby' as you're referring to. Which OS are you using?
package helloworld;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class HelloWorld extends Application {
#Override
public void start(Stage primaryStage) {
Button btn = new Button();
btn.setText("Say 'Hello World'");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("Hello World!");
}
});
StackPane root = new StackPane();
root.setBackground(null);
root.getChildren().add(btn);
ProgressIndicator piLoader = new ProgressIndicator();
piLoader.setMaxSize(32d, 32d);
root.getChildren().add(piLoader);
Scene scene = new Scene(root, 300, 250, Color.BLACK);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}

JavaFX: Undecorated Window

I am attempting to make a Windows PC Toast notification. Right now I am using a mixture of Swing and JavaFX because I did not find a way to make an undecorated window with FX. I would much prefer to only use JavaFX.
So, how can I make an undecorated window?
Edit: I have discovered that you can create a stage directly with new Stage(StageStyle.UNDECORATED).
Now all I need to know is how to initialize the toolkit so I can call my start(Stage stage) method in MyApplication. (which extends Application)
I usually call Application.launch(MyApplication.class, null), however that shields me from the creation of the Stage and initialization of the Toolkit.
So how can I do these things to allow me to use start(new Stage(StageStyle.UNDECORATED)) directly?

I don't get your motivation for preliminary calling the start()-method setting a stage as undecorated, but the following piece of code should do what you want to achieve.
package decorationtest;
import javafx.application.Application;
import javafx.stage.StageStyle;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class DecorationTest extends Application {
public static void main(String[] args) {
Application.launch(args);
}
#Override
public void start(Stage primaryStage) {
primaryStage.initStyle(StageStyle.UNDECORATED);
Group root = new Group();
Scene scene = new Scene(root, 100, 100);
primaryStage.setScene(scene);
primaryStage.show();
}
}