How can I cause a child process to exit when the parent does?

While you cannot protect against a hard abort (e.g. SIGKILL on Unix), you can protect against other signals that cause your parent process to shut down (e.g. SIGINT) and clean up your child process. You can accomplish this through use of shutdown hooks: see Runtime#addShutdownHook, as well as a related SO question here.

Your code might look something like this:

String[] command;
final Process childProcess = new ProcessBuilder(command).start();

Thread closeChildThread = new Thread() {
    public void run() {


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