How to add an xml element in Java 1.4

Question

I am trying to add a "title" element but am getting a NO_MODIFICATION_ALLOWED_ERR error...

private static void saveDoc(String f) throws Exception { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(f); // create DOMSource for source XML document DOMSource xmlSource = new DOMSource(doc); Node nextNode = xmlSource.getNode().getFirstChild(); while (nextNode != null) { System.out.print("\n node name: " + nextNode.getNodeName() + "\n"); if (nextNode.getNodeName().equals("map")) { nextNode.appendChild(doc.createElement("title"));

the line above is throwing error:

Exception in thread "main" org.w3c.dom.DOMException: NO_MODIFICATION_ALLOWED_ERR: An attempt is made to modify an object where modifications are not allowed. at com.sun.org.apache.xerces.internal.dom.ParentNode.internalInsertBefore(Unknown Source) at com.sun.org.apache.xerces.internal.dom.ParentNode.insertBefore(Unknown Source) at com.sun.org.apache.xerces.internal.dom.NodeImpl.appendChild(Unknown Source) at myProject.Main.saveDoc(Main.java:171) at myProject.Main.main(Main.java:48)

 break; } nextNode = nextNode.getNextSibling(); } }

My xml file looks like this:

<?xml version="1.0" encoding="UTF-8"?> <?dctm xml_app="LOPackage"?> <!DOCTYPE map PUBLIC "-//OASIS//DTD DITA Map//EN" "file:C:/Documents%20and%20Settings/joe/Desktop//LOPackage/map.dtd"> <map xmlns:ditaarch="http://dita.oasis-open.org/architecture/2005/" class="- map/map " ditaarch:DITAArchVersion="1.1" domains="(map mapgroup-d) (topic indexing-d)"> <topicref class="- map/topicref " href="dctm://ai/0501869e80002504?DMS_OBJECT_SPEC=RELATION_ID" type="Le"/> <topicref class="- map/topicref " href="dctm://ai/0501869e80002505?DMS_OBJECT_SPEC=RELATION_ID" type="Pr"/> <topicref class="- map/topicref " href="dctm://ai/0501869e80002506?DMS_OBJECT_SPEC=RELATION_ID" type="Pr"/> </map>

jelovirt · Accepted Answer · 2008-11-04 11:12:27Z

Not sure if that's the reason, but check if your DOM implementation validates all the changes to the DOM. Because in you code,

nextNode.appendChild(doc.createTextNode("title"));

will attempt to create a text node as the child of map element and DITA Map doesn't allow that. Instead, try

Element title = doc.createElement("title"); title.appendChild(doc.createTextNode("title content")) nextNode.appendChild(title);

Good insight. But I changed the code (and updated the question), same problem occurs.

Bogdan · Accepted Answer · 2008-11-03 22:13:19Z

For some reason, the parent node seems to be read-only. Clone the document by using:

Document newDoc = doc.cloneNode(true);

Set it to read-write by:

newDoc.setReadOnly(false,true); // ^^^^ also sets children

Then do your stuff. I would return the new document after saving it though.

neither Node nor Document has a setReadOnly property in 1.4. Could you help me with this?

Tim · Accepted Answer · 2008-11-04 04:43:48Z

Where is the original document coming from?

That's the cause of the issue - the code that's reading in the document is constructing a read-only document. Without knowing how you're reading it in, it's pretty hard to work out how to change that.

I just did a quick test on Windows with JDK 1.4.2-11, and I can confirm that using the DocumentBuilderFactory (with the XML content coming from a Reader) does not create a read only Document.

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