FULL PRODUCT VERSION :
java version "1.6.0_01-ea"
Java(TM) SE Runtime Environment (build 1.6.0_01-ea-b01)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_01-ea-b03, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux jupiter 2.6.19-1.2895.fc6 #1 SMP Wed Jan 10 18:50:56 EST 2007 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
One should be able to add String to an instance of GapContent prior to creating an instance of DefaultStyledDocument and have that String display correctly. However, only the first character is displayed. While if a String is added afterwards, that gets displayed correctly. See the following code snippet (full example program follows later):

gapContent.insertString(0, "ABC"); // only the 'A' gets displayed
DefaultStyledDocument document = new DefaultStyledDocument(gapContent, styleContext);
gapContent.insertString(0, "XYZ"); // "XYZ" gets displayed

  Program displays "XYZA".


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
see above

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
String ABC should be displayed in full, example program should display "XYZABC".
ACTUAL -
Example program displays "XYZA".

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.GapContent;
import javax.swing.text.StyleContext;

public class AppBug
{
    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                try
                {
                    new AppBug().go();
                }
                catch (final Exception e)
                {
                    e.printStackTrace();
                }
            }
        });
    }

    private void go()
        throws BadLocationException
    {
        JFrame jFrame = new JFrame("AppBug");
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        GapContent gapContent = new GapContent();
        StyleContext styleContext = new StyleContext();

        gapContent.insertString(0, "ABC"); // only the 'A' gets displayed

        DefaultStyledDocument document =
            new DefaultStyledDocument(gapContent, styleContext);

        gapContent.insertString(0, "XYZ"); // "XYZ" gets displayed

        JTextPane jTextPane = new JTextPane(document);
        jTextPane.setPreferredSize(new Dimension(250, 155));
        jFrame.add(jTextPane);
        jFrame.pack();
        jFrame.setVisible(true);
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
never add content to and instance of GapContent prior to creating a DefaultStyledDocument.