FULL PRODUCT VERSION :
java version 1.6.0_06
Java SE Runtime Environment (build 1.6.0_06-b02)

ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.24-16 generic
(Ubuntu 8.04 Hardy Heron)

A DESCRIPTION OF THE PROBLEM :
java version 1.6.0_06:

In Java applications, "Alt Gr" and therefore third level keys don't work.
Ctrl+Alt+<key> doesn't work either.
This means I cannot write e.g. "\", "{", "}", "[", "]", "~" ...
The problem doesn't seem to be new, but - on my computer - did not occur in java version 1.6.0_03.
All in all, I get this problem since I updated ubuntu from 7.10 to 8.04 and with this from java 6 update 3 to update 6.
I do not have any troubles with "alt gr"  on Windows operating systems as well.

Keyboard is German.

The key description you get with KeyEvent.getKeyText(int)-method on "alt gr"-key press is: "Unknown keyCode: 0x0"

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Get a German keyboard (or probably any other European).

2. Install jdk1.6.0_06.

3. Create any application that contains a text input component (e.g. java.awt.TextField)

4. Try to write e.g. "\" by pressing <alt gr>+? -- this should not work ...


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test;

import java.awt.*;
import java.awt.event.*;


public class Main extends java.awt.Frame
{
    private TextField textField = new TextField();
    
    public Main()
    {
	 addWindowListener(new WindowAdapter()
	 {
	    public void windowClosing(WindowEvent e)
	    {
		System.exit(0);
	    }
	 });
	 
	 setSize(200, 80);
	 
	 add(textField);
    }
    
    public static void main(String[] args)
    {
       new Main().setVisible(true);
    }
    
}

---------- END SOURCE ----------

Release Regression From : 6u3
The above release value was the last known release where this 
bug was not reproducible. Since then there has been a regression.