How to give and take commands from a third party command line program using Process class in java?

I am trying to run a command line program and interact with it, i.e., give commands as well as take commands in response and the commands I give should change the previous state of the program. I tried and have been able to execute it successfully but for the interaction part there is no response. This is my code :

 protected void doWork() {
        SwingWorker<String, Void> worker = new SwingWorker<String, Void>() {
            @Override
            protected String doInBackground() throws Exception {
                ProcessBuilder builder = new ProcessBuilder("e:/program files/urjtag/jtag.exe");
                builder.redirectErrorStream(true);
                Process process = builder.start();
                ConsoleReader consoleReader = new ConsoleReader(process.getInputStream());
                consoleReader.start();
                InputStream is = process.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                 String s = "";
                while((s=br.readLine())!=null){
                 System.out.println(s);
                }
                System.out.println(consoleReader.getResult()+" <<<<<<<<<<<<<");
                int waitFor = process.waitFor();
                consoleReader.join();
                switch (waitFor) {
                case 0:
                    return consoleReader.getResult();
                default:
                    throw new RuntimeException("Failed to execute " + builder.command() + " \nReturned message: "
                            + consoleReader.getResult());
                }
            }
            @Override
            protected void done() {
                try {
                    showCommandResult(get());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (ExecutionException e) {
                    e.printStackTrace();
                    showCommandError(e);
                }
            }
        };
        worker.execute();
}

I took it from here.

I took the idea of using BuffuredReader from here, but there is just no response from the program.

Also when I execute the program nothing shows up, though when I execute it in the folder it shows up its own prompt.