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POHow to get XML node by ID and NamedNodeMap - Java DOM XML
 

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  1. POHow to get XML node by ID and NamedNodeMap - Java DOM XML
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    <p>I have an xml file with messages:</p> <pre><code>&lt;bus&gt; &lt;message id="58afdb36-9080-4dd8-922e-ee516b2b5073"&gt; &lt;retrievedDate&gt;Mon Feb 18 14:43:23 GMT 2013&lt;/retrievedDate&gt; &lt;addedDate&gt;Mon Feb 18 14:43:23 GMT 2013&lt;/addedDate&gt; &lt;state&gt;initialised&lt;/state&gt; &lt;content&gt;content placeholder&lt;/content&gt; &lt;/message&gt; &lt;/bus&gt; </code></pre> <p>I am creating a method to change the state of a message for a given ID.</p> <p>However I keep getting NullPointerException when I try to get the node with the ID I want. Have tried experimenting with <strong><em>getElementById</em></strong> and <strong><em>getElementsByTagName</em></strong>, but I always get null instead of the node I want.</p> <pre><code>public static int updateMessageState(UUID messageID, String newState) throws ParserConfigurationException, SAXException, IOException, TransformerException { String filepath = "data.xml"; DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); Document doc = docBuilder.parse(filepath); // Get Message Node message = doc.getElementById(messageID.toString()); // Find and update the state NamedNodeMap atrMap = message.getAttributes(); Node nodeAtr = atrMap.getNamedItem("state"); nodeAtr.setTextContent(newState); // Save write to XML TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); DOMSource source = new DOMSource(doc); StreamResult result = new StreamResult(new File(filepath)); transformer.transform(source, result); return 0; } </code></pre>
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    1. COCan you post your code?
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    2. COSure. Just posted.
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    3. CO`NamedNodeMap atrMap = message.getAttributes();` will find the attributes of the message tag, but "state" is an sibling *element* of the message tag. You will need to get `message.getParentNode().getChildNodes()` and iterate until you find the "state" tag.
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