OPERATING SYSTEM
----------------
Windows and Linux

FULL JDK VERSION
----------------
All Java 6 releases.
Not reproducible on 5.0 => regression.

RECREATION INSTRUCTIONS
-----------------------

1. Compile and run program TextIssue.java
   You should see a Window with a text field, containing 8 squares.

2. Click inside the Java text field, select all, copy (Ctrl A Ctrl C)
   This copies the content into the system clipboard

3. Click on the Java text field, select all, paste (Ctrl A Ctrl V)
   -> works fine (you still see the 8 squares you copied earlier)

4. Open an native application with a text field (e.g. Eclipse, Notepad,
   Wordpad for example on Windows, or even the address bar of any
   browser)

5. Click inside the native text field, paste again (Ctrl A Ctrl V)
   -> works fine (you still see the 8 squares you copied earlier in
   this editor)

6) In that native text field, select all, copy (Ctrl A Ctrl C)
   This should copy the exact same content you just pasted into the
   system clipboard
 
7) Click on the java text field, select all, paste (Ctrl A Ctrl V)
   This is the problem -> Nothing is pasted and the squares disappear.

This may be related to CR 6586945.

TESTCASE SOURCE
---------------
import javax.swing.JFrame;
import javax.swing.JTextField;

public class TextIssue {
    public static void main(String[] args) {
        JFrame f= new JFrame();
        String s = "\uD840\uDC00\uD840\uDC01\uD840\uDC02\uD840\uDC03\uD840\uDC04\uD869\uDED4\uD869\uDED5\uD869\uDED6";
        final JTextField area = new JTextField(s);
        area.setEditable(true);
        f.getContentPane().add(area);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setVisible(true);
    }
}

Release Regression From : 5.0
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.