Eclipse 未运行 JavaFX 应用程序 - 运行“java”应用程序

Question

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

eg

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.

Answer 1

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.

Answer 2

可能的解决方案从 eclipse 市场https://www.eclipse.org/efxclipse/install.html安装它

Answer 3

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.

Answer 4

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.

Answer 5

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.