How can I keep only one instance of the javafx application at the same time?

Hello
How can I keep only one instance of the javafx application at the same time?
Let not the user run the javafx application is running on your PC.

Hello. This program does what you want. You can probably find a better solution.

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;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.*;
import java.nio.channels.FileLock;
import javafx.application.Platform;
import javafx.stage.WindowEvent;

public class Simpleapp extends Application {

    public static void main(String[] args) {

        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {

        final File file = new File("flag");
        final RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");
        final FileLock fileLock = randomAccessFile.getChannel().tryLock();

        System.out.print(fileLock == null);
        if (fileLock == null) {
            Platform.exit();
        }

        primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");

        StackPane root = new StackPane();
        root.getChildren().add(btn);
        primaryStage.setScene(new Scene(root, 300, 250));

        primaryStage.setOnCloseRequest(new EventHandler() {

            @Override
            public void handle(WindowEvent arg0) {
                try {
                    fileLock.release();
                    randomAccessFile.close();
                    System.out.println("Closing");
                } catch (Exception ex) {
                    System.out.print(ex.getMessage());
                }

            }
        });

        primaryStage.show();
    }
}

Tags: Java

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