If launch via vnc, it will launch the GUI app "Mail"

Main.java

package com.company;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws IOException, InterruptedException {



        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    while (true) {
                        runLoop();
                        Thread.sleep(1000 * 10);

//                        Thread.sleep(1000*60*20);
                    }
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        }).start();

    }

    private static void runLoop() throws IOException, InterruptedException {
        File file = new File(".doRunForRunMailJar");
        System.out.println("does file exist? " + file.exists());
        if ( file.exists() ) {
            file.delete();

            runProcess("killall Mail");
            Thread.sleep(1000*5);
            runProcess("open /Applications/Mail.app");

        }
    }

    private static void runProcess(final String process) throws IOException, InterruptedException {
        System.out.println("Running process: " + process);
        // http://stackoverflow.com/a/14168097/247325
        final Process p = Runtime.getRuntime().exec(process);
        inheritIO(p.getInputStream(), System.out);
        inheritIO(p.getErrorStream(), System.err);

        p.waitFor();
        System.out.println("Done running process: " + process);
    }


    private static void inheritIO(final InputStream src, final PrintStream dest) {
        new Thread(new Runnable() {
            public void run() {
                Scanner sc = new Scanner(src);
                while (sc.hasNextLine()) {
                    dest.println(sc.nextLine());
                }
            }
        }).start();
    }
}