Works on debug mode but not on run mode

Dear Java Programmers:

During my life I have programed in several languages all of them compiled or interpreted.
Now I am doing in Java which I use as a type of C, but I have a lot of problems with transporting the code from one machine to another, in fact I am asking for help, because I am working with two machines one foot apart and my code runs perfectly in one but not in the other.
I am at lost on how to solve this problem, as it supposed that the code should run in any machine as my C code works on any machine C compiler.
The details follow:

I have written some small keyboard driven java applications.
They work OK on Eclipse and Netbeans on Centos 4.8 with jdk1.5.0_09.
But, on Centos 5.4 with any Eclipse, Netbeans and java they ignore the key
pressed when they run, but work OK under debug.
I do not know whether it is pertinent but the Centos 4.8 machine has a PS2 keyboard plug and the Centos 5.4 one an usb one.
I know that I was very silly of me to use Java in something in which it
does not have any particular advantage over C, but now it is too late and I need
urgent help, so any clue would be greatly appreciated.
As I said before the code is not the problem as it works in one machine and it is a very usual piece of code, but just in case the pertinent parts of it follow:

The pertinent part of a Canvas class is as follows:

Code :

---

         key = new Key();
         KeyboardFocusManager manager;
         manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
         manager.addKeyEventDispatcher(key);

---

In the Canvas I also set the focus, which I do not use, but need for the
next class.


I use the Key class to obtain the characters typed through e:

Code :

---

package system;
 
import java.awt.*;
import java.awt.event.KeyEvent;
 
public class Key implements KeyEventDispatcher {
 
         KeyEvent e;
         boolean ready;
 
         public Key() {
 
         }
 
         public boolean dispatchKeyEvent(KeyEvent e) {
                 if (e.getID() == KeyEvent.KEY_PRESSED) {
                         this.e = e;
                         ready = true;
                 }
                 return true;
         }
 
         public KeyEvent getKey() {
                 while (!ready) {
                 }
                 ready = false;
                 return e;
 
         }
}

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