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How to start and stop highlights?
public void checkWord(DocumentEvent e) {
            try {
                Highlighter redZigZag = mainTxtTypeArea.getHighlighter();
                int start = Utilities.getWordStart(mainTxtTypeArea, e.getOffset());
                int end = Utilities.getWordEnd(mainTxtTypeArea, e.getOffset());
                int length = end - start;
                String word = mainTxtTypeArea.getDocument().getText(start, length);

                if(dictionary.find(word) == false && Character.isWhitespace(word.charAt(0)) == false){
                    System.out.println("Incorrect: "+word);
                    //I found a zigzag highlighter online, but the default yields the same result
                    redZigZag.addHighlight(start, end, painter);
                } else {
                    System.out.println("Correct: "+word);
                }

            } catch (BadLocationException ex) {}
        }

private void mainTxtTypeAreaKeyReleased(java.awt.event.KeyEvent evt) {
    checkWord();
}

private void checkWord() {
    try {
        int start = Utilities.getWordStart(mainTxtTypeArea, mainTxtTypeArea.getCaretPosition());
        int end = Utilities.getWordEnd(mainTxtTypeArea, mainTxtTypeArea.getCaretPosition());
        int length = end - start;

        if(length > 0) {
            StyledDocument doc = mainTxtTypeArea.getStyledDocument();
            SimpleAttributeSet as = new SimpleAttributeSet();

            if(dictionary.find(doc.getText(start, length)) == false){
                StyleConstants.setItalic(as, true);
                StyleConstants.setForeground(as, Color.red);
            } else {
                StyleConstants.setItalic(as, false);
                StyleConstants.setForeground(as, Color.BLACK);
            }
            doc.setCharacterAttributes(start, length, as, false);
        }
    } catch (BadLocationException ex) {
        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
    }
}