XML file is not updating using the jdom

following is my java code for reading a xml file and updating some values in it.

 public static void writeLexicon(String word, String tag) {
    int newFreq=0;
    int tagAvailability = 0;
    int wordAvaialbility = 0;
    try {
        if (new File("./src/Lexicon.xml").exists()) {

            Document readDoc = getXMLFile();
            Element root = readDoc.getRootElement();
            for (Element curElem : root.getChildren("lexiconElement")) {
                if (word.equals(curElem.getChildText("word"))) {  // word avaialble

                    List<Element> subEle = curElem.getChildren();

                    for (int i = 1; i < subEle.size(); i++) {
                        if (tag.equals(subEle.get(i).getChildText("tag"))) {

                            int curFreq = Integer.parseInt(subEle.get(i).getChildTextTrim("frequancy"));
                            newFreq = curFreq + 1;
                            subEle.get(i).getChild("frequancy").setText(String.valueOf(newFreq));
                            tagAvailability = 1;
                            //break;
                        }
                    }
                    if (tagAvailability == 0) {
                        Element newTag = new Element("tag").setText(tag);

                        Element newFrequancy = new Element("frequancy").setText("1");
                        newTag.addContent(newFrequancy);
                        curElem.addContent(newTag);
                    }

                    wordAvaialbility = 1;
                }


            }
            if (wordAvaialbility == 0) {
                Element lexiconElement = new Element("lexiconElement");
                Element newWord = new Element("word").setText(word);

                Element newTag = new Element("tag").setText(tag);

                Element newFrequancy = new Element("frequancy").setText("1");
                newTag.addContent(newFrequancy);
                lexiconElement.addContent(newWord);
                lexiconElement.addContent(newTag);

                root.addContent(lexiconElement);
                XMLOutputter xmlOutput = new XMLOutputter(Format.getPrettyFormat());
                xmlOutput.output(readDoc, new FileOutputStream(new File("./src/Lexicon.xml")));


            }

        } else {

            Document doc = new Document(); // create  a JDOM document
            String freq = "1";
            Element theRoot = new Element("Lexicon"); // Creates a element named Lexicon and makes it the root
            doc.setRootElement(theRoot);

            Element lexiconElement = new Element("lexiconElement");
            Element Word = new Element("word");
            Element Tag = new Element("tag");
            Element frequency = new Element("frequency");

            Word.addContent(new Text(word));
            Tag.addContent(new Text(tag));
            frequency.addContent(new Text(freq));

            Tag.addContent(frequency);
            lexiconElement.addContent(Word);
            lexiconElement.addContent(Tag);

            theRoot.addContent(lexiconElement);
            XMLOutputter xmlOutput = new XMLOutputter(Format.getPrettyFormat());
            xmlOutput.output(doc, new FileOutputStream(new File("./src/Lexicon.xml")));



        }


    } catch (Exception e) {
        System.out.println(e);
    }
}

i need to get the value in frequancy tag and increment the value by one and add to same xml file. but it didnt work with the above code.