CODEWITHSUNDEEP
javaeclipsemacosjavafx
Joe Morgan
Joe Morgan

Reputation: 441

Eclipse not running JavaFX application - runs 'java' application

Whenever I create a project in Eclipse and include javafx, the application does not load when I click the run button.

e.g.

package test;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class test extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");
        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.getChildren().add(btn);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }
}

This should run a simple hello world application, taken from the oracle documentation. However when I 'run' this code, no windows open. Instead an application called 'java' opens. It appears 'java' is simply a 'unix executable file' located in 'jdk1.8.0_25.jdk/contents/home/bin'. The application 'java' displays absolutely nothing, and cannot be shut down without force quitting.

I'm running eclipse on a Macbook. I've probably left out some important details...

Does anyone know why my application is not running as it should? Forgive my naivety, I'm new to java and eclipse.

Many Thanks

EDIT:

import javafx.application.Application;
import javafx.stage.Stage;


public class JavaFX extends Application {

    public static void main(String[] args){
            launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        // TODO Auto-generated method stub
        stage.show();

    }

}

This simple program also gives the same error.

Upvotes: 6

Views: 8937

Answers (5)

Jongbo Im
Jongbo Im

Reputation: 23

if the pane is not showing up go to run configuration by clicking little arrow by run button and go to argument tab and uncheck the -use the -xstartonfirstthtread box then run again.

Upvotes: 0

rpetruzz
rpetruzz

Reputation: 119

Just to let you know, I created a new project in Eclipse for Java and copy / pasted your code into it. Then just simply clicked on the run icon. It worked perfectly. I'm going to attach screen grabs of my setup for you.

Initial Start up

Run configuration Main

Run configuration Arguments

Run configuration command line

Upvotes: 0

heyitschrislol
heyitschrislol

Reputation: 161

So I know this is an old question, but I ran into what I believe to be the same issue recently and wanted to share the solution I found (although I have no insight as to why it works).

pictured

Go to Run Configurations for the main class, and on the "Arguments" tab, uncheck the box where it says "Use the -XstartOnFirstThread argument when launching with SWT".

To add a visual example of the problem so that someone more knowledgable than I can possibly explain why this happens/why this solution works:

This is what you get when you try to run the program. An application simply called "java" appears to be running, but nothing is showing.

I hope this information is able to help someone.

Upvotes: 16

Quoshak
Quoshak

Reputation: 11

I've had the same problem when I was trying to run JavaFX main class in an existing SWT project with maven dependency:

<dependency>
   <groupId>org.eclipse.swt</groupId>
    <artifactId>org.eclipse.swt.cocoa.macosx.x86_64</artifactId>
    <version>4.3</version>
</dependency>

When I comment out this dependency, application window was shown and everything worked well.

Upvotes: 0

Mark
Mark

Reputation: 1983

possible solution install this from the eclipse marketplace https://www.eclipse.org/efxclipse/install.html

Upvotes: 1

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