How to add an xml element in Java 1.4
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>
Asked by: Marcus680 | Posted: 28-01-2022
Answer 1
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);
Answer 2
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.
Answered by: John379 | Posted: 01-03-2022Answer 3
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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