How to get a list of current open windows/process with Java?

Question

Does any one know how do I get the current open windows or process of a local machine using Java?

What I\'m trying to do is: list the current open task, windows or

Answer 1

This might be useful for apps with a bundled JRE: I scan for the folder name that i'm running the application from: so if you're application is executing from:

C:\Dev\build\SomeJavaApp\jre-9.0.1\bin\javaw.exe

then you can find if it's already running in J9, by:

public static void main(String[] args) {
    AtomicBoolean isRunning = new AtomicBoolean(false);
    ProcessHandle.allProcesses()
            .filter(ph -> ph.info().command().isPresent() && ph.info().command().get().contains("SomeJavaApp"))
            .forEach((process) -> {
                isRunning.set(true);
            });
    if (isRunning.get()) System.out.println("SomeJavaApp is running already");
}

Answer 2

For windows I use following:

Process process = new ProcessBuilder("tasklist.exe", "/fo", "csv", "/nh").start();
new Thread(() -> {
    Scanner sc = new Scanner(process.getInputStream());
    if (sc.hasNextLine()) sc.nextLine();
    while (sc.hasNextLine()) {
        String line = sc.nextLine();
        String[] parts = line.split(",");
        String unq = parts[0].substring(1).replaceFirst(".$", "");
        String pid = parts[1].substring(1).replaceFirst(".$", "");
        System.out.println(unq + " " + pid);
    }
}).start();
process.waitFor();
System.out.println("Done");