InputStream hung from Runtime.getRuntime().exec

Question

Dear all,
I am trying to use the following code to run a Runtime.getRuntime().exec("my_selection.exe") method and redirect all the output from the process to my JTextArea.
My program is an executable called "my_selection.exe", which runs under DOS something like:
My Selection Utilities:
type the command -
o : open an item
l : list subitems
q : exit
Please select your options:But when I run my Test program, the above selection menu does not show in my JTextArea. Only after I type q (which is exit command in my_selection), will all the output shown in TextArea.
I tested the inputstream.available(), but it always == 0.
Anyone can help point me out what is wrong here?
BTW, when I use the same program to run "copy a.txt a" by exec("cmd.exe"), it works ok, no matter whether it prompts for owerwrite the existing file or not.
Many thanks!
I tried the code,
/* part of the code */
public static void main(String[] args) {
     Test t = new Test();
     t.setTitle("Basic GUI");
     t.init(); // init GUI
     t.connect();
     t.show();
private static void log(Object text) {
     getTextArea().setCaretPosition(getTextArea().getText().length());
     getTextArea().setText(getTextArea().getText() + text.toString() + "\n");
private Thread getInputStreamListener() {
     if(listener == null) {
          Runnable runnable = new Runnable() {
               public void run() {
                    try {
                         String text = "";
                         while (true) {
                              while (inputStream.available()==0) {
                                   Thread.currentThread().sleep(100);
                              byte[] bytes = new byte[inputStream.available()];
                              inputStream.read(bytes);
                              text = new String(bytes);
                              log("> " + text);
                    catch(Exception e) {
                         handleException(e);
          listener = new Thread(runnable);
          listener.setName("out listener");
          listener.setPriority(2);
          listener.start();
     return listener;
private Thread getErrorStreamListener() {
     if(listener == null) {
          Runnable runnable = new Runnable() {
               public void run() {
                    try {
                         String text = "";
                         while (true) {
                              while (errorStream.available()==0) {
                                   Thread.currentThread().sleep(100);
                              byte[] bytes = new byte[errorStream.available()];
                              errorStream.read(bytes);
                              text = new String(bytes);
                              log("> " + text);
                    catch(Exception e) {
                         handleException(e);
          listener = new Thread(runnable);
          listener.setName("out error listener");
          listener.setPriority(2);
          listener.start();
     return listener;
private static void handleException(Throwable t) {
     log(t);
private void connect() {
     try{
          process = Runtime.getRuntime().exec(new String[] {"my_selection.exe"});
          inputStream = new BufferedInputStream(process.getInputStream());
          outputStream = new BufferedOutputStream(process.getOutputStream());
          errorStream = new BufferedInputStream(process.getErrorStream());
          getInputStreamListener();
          getErrorStreamListener();
     catch(Exception e) {
          log(e);

Answer 1

Note in the above code all "listener" variable in:
private Thread getErrorStreamListener() method
show be "listener1".
Even I changed it, it does not work either.
Please help.
Thanks!