Execute commands in Java/Gradle

executecommand.gradle

def executeCommand(String command) {
    println('executing commands:')
    println(command)
    StringBuffer output = new StringBuffer();
    Process p;
    try {
        p = Runtime.getRuntime().exec(command);
        p.waitFor();
        BufferedReader reader = 
                       new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";           
        while ((line = reader.readLine())!= null) {
            output.append(line + "\n");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    println output.toString()
    return output.toString();
}