How to append an attribute to an existing xml using stax parser

Question

I want to appened an attribute to an existing xml using stax parse. Please suggest.

Below is the snippnet code which I need to appened.

<un:UtranCell id="RNC17-1-1">

It as to look like as follow after appending

<un:UtranCell id="RNC17-1-1" modifier="delete">

Below is snippnet code i tried. but i am failied to add the attribute

try {               
      File fXmlFile = new File("/home/xgeoraj/bcgImportFiles/imports/UtranCell.xml");
      DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
      Document doc = dBuilder.parse(fXmlFile);
      System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
      NodeList nList = doc.getElementsByTagName("un:UtranCell");
      for (int temp = 0; temp < nList.getLength(); temp++) {
        Node nNode = nList.item(temp);
        System.out.println("\nCurrent Element :" + nNode.getNodeName());
        if (nNode.getNodeType() == Node.ELEMENT_NODE) {
          Element eElement = (Element) nNode;
          System.out.println("UtranCell id is: " + eElement.getAttribute("id"));
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
}

Below is the XML file in which i need to add it.

<?xml version="1.0" encoding="UTF-8"?>
<bulkCmConfigDataFile xmlns:un="utranNrm.xsd" xmlns:xn="genericNrm.xsd" xmlns:gn="geranNrm.xsd" xmlns="configData.xsd" xmlns:es="EricssonSpecificAttributes.14.02.xsd">
    <fileHeader fileFormatVersion="32.615 V4.5" vendorName="Ericsson"/>
    <configData dnPrefix="Undefined">
        <xn:SubNetwork id="ONRM_ROOT_MO_R">
            <xn:SubNetwork id="RNC17">
                <xn:MeContext id="RNC17">
                    <xn:ManagedElement id="1">
                        <un:RncFunction id="1">
                            <un:UtranCell id="RNC17-1-1" modifier="delete">

Answer 1

Adding an attribute to the element you have retrieved which is what I think you want to do is done by setting an element. taking out the if-statement.

if (nNode.getNodeType() == Node.ELEMENT_NODE) {
    Element eElement = (Element) nNode;
    System.out.println("UtranCell id is: " + eElement.getAttribute("id"));
    eElement.setAttribute("modifier", "delete"); // <-- This is the added line
}

For a reference see the javadoc for Element .