DOM parsing in Java not able to get the nested notes

I have to parse a xml file in which I have many name value pairs. I have to update the value in case it matches a given name.

I opted for DOM parsing as it can easily traverse any part and can quickly update the value. It is however giving me some wired results when I am running it on my sample file.

I am new to DOM so if someone can help it can solve my problem. I tried various but all resulting in either null values for content or #text node name.

    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(xmlFilePath);


Node NVPairs = document.getElementsByTagName("NVPairs").item(0);
NodeList nodes = NVPairs.getChildNodes();
for (int i = 0; i < nodes.getLength(); i++) {

    Node node = nodes.item(i);

    if(node.hasChildNodes())
    {
        if ("Tom".equals(node.getFirstChild().getTextContent())) {
            node.getLastChild().setTextContent("2000000");
        }
    }
}

Sample xml

    <?xml version="1.0" encoding="UTF-8" standalone="no"?><application>
<NVPairs>
    <nameValuePair>
        <name>Tom</name>
        <value>12</value>
    </nameValuePair>
    <nameValuePair>
        <name>Sam</name>
        <value>121</value>
    </nameValuePair>
</NVPairs>