Single xml synchronize access

I have a single XML file and my program have many calls can update it, potentially at close to the same time. ( I have [Fatal Error] Premature end of file]
How i can synchronize access to the single xml file?

Here my code:
public static void update (String id, String child, String value) {
          try {
               DocumentBuilder db = DocumentBuilderFactory.newInstance()
                         .newDocumentBuilder();
               Document doc = db.parse(NetworkManagerGUI.xmlData);
               org.w3c.dom.Node element = org.apache.xpath.XPathAPI
                         .selectSingleNode(doc.getDocumentElement(), "//node[@id='"
                                   + id + "']");
               if (element != null)
                    ((Element) element).setAttribute(child, value);
               TransformerFactory tFactory = TransformerFactory.newInstance();
               Transformer transformer = tFactory.newTransformer();
               transformer.setOutputProperty(OutputKeys.INDENT,"yes");
               DOMSource source = new DOMSource(doc);
               StreamResult result = new StreamResult(NetworkManagerGUI.xmlData);
               transformer.transform(source, result);
          } catch (Exception ex) {
How synchronize many updates?

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