KeyBindingManager problem handling multiple key


I've looked around the wiki, the forum and some test class but i haven't found a solution at my problem:

i'm using KeyBindingManager for handling multiple keys (like up+left+shot+etc…) but i'm having a problem.

if the key pressed are more than 2 or 3, simply only the first 2 or 3 key pressed event are run.

for example if i press G+H+J then G and H code are executed, but not J. if I release G or H key, then the J code is executed.  :?

Tips are welcome^^

Here my test class ( i call update() method every ~20ms )

import java.util.ArrayList;

import com.jme.input.KeyBindingManager;
import com.jme.input.KeyInput;

public class KeyReader{

   public KeyReader(){
      KeyBindingManager keyboard = KeyBindingManager.getKeyBindingManager();

      keyboard.set("1asd", KeyInput.KEY_G);
      keyboard.set("2asd", KeyInput.KEY_H);
      keyboard.set("3asd", KeyInput.KEY_J);
      keyboard.set("4asd", KeyInput.KEY_SPACE);

   public void update() {
           if (KeyBindingManager.getKeyBindingManager().isValidCommand("1asd", true)) {
               System.out.println("1_Tasto premuto!!!!!!!!");
           if (KeyBindingManager.getKeyBindingManager().isValidCommand("2asd", true)) {
               System.out.println("2_Tasto premuto!!!!!!!!");
           if (KeyBindingManager.getKeyBindingManager().isValidCommand("3asd", true)) {
               System.out.println("3_Tasto premuto!!!!!!!!");
           if (KeyBindingManager.getKeyBindingManager().isValidCommand("4asd", true)) {
               System.out.println("4_Tasto premuto!!!!!!!!");