How to avoid IllegalStateException???

Hello!

I try to apply Style dynamic to a JTextPane, but I get this Exception Al the time:

java.lang.IllegalStateException: Attempt to mutate in notification
        at javax.swing.text.AbstractDocument.writeLock(AbstractDocument.java:1335)
        at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:660)
        at fredrik.application.texteditor.JavaDocument.updateStyle(JavaDocument.java:223)
        at fredrik.application.texteditor.TextEditorPane.updateStyle(TextEditorPane.java:148)
        at fredrik.application.texteditor.UserInterfaceManager.updateStyle(UserInterfaceManager.java:937)
        at fredrik.application.texteditor.CaretChangeListener.stateChanged(CaretChangeListener.java:18)
        at javax.swing.text.DefaultCaret.fireStateChanged(DefaultCaret.java:634)

        etc...
       

What I want to do is that when the user types certain words I would like to change the color for
those words like they do in TextPad or UltraEdit.


This is how it is made:

1) I have connect a CaretChangeListener to mu JTextPane, it will idicate when the user
have typed something.

2) After that the code below will be executed, called from the listener above. It will¨
change the new text into a certain Style if it is a reserved word.

    public synchronized void updateStyle()
    {
        DefaultCaret defaultCaret = (DefaultCaret) jTextPane.getCaret();
        int caretPos = defaultCaret.getDot();

        String text = jTextPane.getText();

        if(text.length() > 1)
        {
            int start = getStartIndex(text, caretPos);

            String word = getWord(text, start, caretPos);

            if(wordIsReserved(word))
            {

                AbstractDocument abstractDocument = (AbstractDocument) jTextPane.getDocument();

                try
                {
                    abstractDocument.readLock();
                    try
                    {
                        abstractDocument.replace(start, caretPos, word, (javax.swing.text.AttributeSet) jTextPane.getStyle("bluestyle") );
                    }
                    finally
                    {
                        abstractDocument.readUnlock();
                    }

                }
                catch(BadLocationException ble)
                {
                    ble.printStackTrace();
                }
            }
        }
    }

    public int getStartIndex(String text, int end)
    {
        int retValue = 0;
        String temp = text.substring(0, end);

        if(temp.lastIndexOf(" ") != -1)
        {
            retValue = temp.lastIndexOf(" ") + 1;
        }

        return retValue;
    }

    public String getWord(String text, int start, int end)
    {
        String word = text.substring(start, end);

        return word;
    }

    public boolean wordIsReserved(String word)
    {
        boolean retValue = false;
       
        //reservedWords is an array with reserved words..
       
        for(int i = 0; i < reservedWords.length; i++)
        {
            if(word.equals(reservedWords[i]))
            {
                retValue = true;
                break;
            }
        }

        return retValue;
    }

3) But it seems that I can't change the the jTextPane when I wan't.

So the question is how do I avoid IllegalStateException, or how do I wait for the right
state occur so I can do ny change?

Mvh

Fredrik