Detect if Java application was run as a Windows admin

Question

I have a Java application. Is there anyway I can tell if the process was run with admin privileges, on Windows 7.

Answer 1

Here is a solution on Windows 10, I guess that it runs properly on other Windows OS too.

public static boolean isAdmin() {
    try {
        ProcessBuilder processBuilder = new ProcessBuilder("cmd.exe");
        Process process = processBuilder.start();
        PrintStream printStream = new PrintStream(process.getOutputStream(), true);
        Scanner scanner = new Scanner(process.getInputStream());
        printStream.println("@echo off");
        printStream.println(">nul 2>&1 \"%SYSTEMROOT%\\system32\\cacls.exe\" \"%SYSTEMROOT%\\system32\\config\\system\"");
        printStream.println("echo %errorlevel%");

        boolean printedErrorlevel = false;
        while (true) {
            String nextLine = scanner.nextLine();
            if (printedErrorlevel) {
                int errorlevel = Integer.parseInt(nextLine);
                return errorlevel == 0;
            } else if (nextLine.equals("echo %errorlevel%")) {
                printedErrorlevel = true;
            }
        }
    } catch (IOException e) {
        return false;
    }
}

Answer 2

Or you could do this:

System.getenv().get("USER")

And see which user started the process.

When I run it as me I get "goran", when I run it with sudo I get "root". Works on Linux. Probably what was needed.