Question

(individual question from IDE-Style program running )

Answer 1

Your best option is probably to fork off a new JVM through ProcessBuilder.

It is however possible to kill the internal program (and all the threads it spawned) using ThreadGroups. (I don’t recommend it though. It uses the stop method which according to docs is “Deprecated. This method is inherently unsafe. See Thread.stop() for details.“):

public class Main {

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

        ThreadGroup internalTG = new ThreadGroup("internal");
        Thread otherProcess = new Thread(internalTG, "Internal Program") {
            public void run() {
                OtherProgram.main(new String[0]);
            }
        };

        System.out.println("Starting internal program...");
        otherProcess.start();

        Thread.sleep(1000);
        System.out.println("Killing internal program...");

        internalTG.stop();
    }
}

 

class OtherProgram {

    public static void main(String[] arg) {
        for (int i = 0; i < 5; i++)
            new Thread() {
                public void run() {
                    System.out.println("Starting...");
                    try {
                        sleep(5000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("Stopping...");
                }
            }.start();
    }
}

Output:

Starting internal program...
Starting...
Starting...
Starting...
Starting...
Starting...
Killing internal program...