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POWhy can I not remove a child element I've just found? NOT_FOUND_ERR
 

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  1. POWhy can I not remove a child element I've just found? NOT_FOUND_ERR
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    <p>I'm building a script which has to patch XML files, including replacing one list of elements with another. The following function applies a patch (involving a possibly empty list of elements with the same name) onto a parent Element's list of elements by the same name (also possibly an empty list). (This is only a small part of the patching logic).</p> <p>Why, when I run the code, do I get the following error?</p> <pre><code>org.w3c.dom.DOMException: NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist. at com.sun.org.apache.xerces.internal.dom.ParentNode.internalRemoveChild(ParentNode.java:503) at com.sun.org.apache.xerces.internal.dom.ParentNode.removeChild(ParentNode.java:484) at CombineSweeps$PTReplaceNodeList.apply(CombineSweeps.java:514) </code></pre> <p>(Line 514 is labelled below.) As far as I understand it, I've just verified that the element exists (because NodeList is live, its first entry will always be the next match or null). Interestingly, this isn't always a problem.</p> <pre><code>private static class PTReplaceNodeList extends PTBase { private final String name; private final String nextElement; private final List&lt;Node&gt; childList; ... int apply(Document document, Node parent, Node node_unused) { NodeList nodes; // A marker for where to insert our nodes. // We make a guess using nextElement (if null, means at end). Node refNode = null; if (parent instanceof Document) { // root element Document parDoc = (Document) parent; nodes = parDoc.getElementsByTagName(name); if (nextElement != null) { refNode = parDoc.getElementsByTagName(nextElement).item(0); } } else { Element parElt = (Element) parent; nodes = parElt.getElementsByTagName(name); if (nextElement != null) { refNode = parElt.getElementsByTagName(nextElement).item(0); } } while (true) { // iterate through the list of nodes Node node = nodes.item(0); if (node == null) { break; } // Reliable guess: insert before node following last in list refNode = node.getNextSibling(); parent.removeChild(node); // line 514 } for (Node child : childList) { Node imported = document.importNode(child, true); parent.insertBefore(imported, refNode); } return childList.size(); } } </code></pre> <p>Edit: I used the following function as a replacement for <code>getElementsByTagName()</code> (see accepted answer).</p> <pre><code>/** Returns all direct children of node with name name. * * Note: not the same as getElementsByTagName(), which finds all descendants. */ static List&lt;Node&gt; getChildNodes( Node node, String name ){ ArrayList&lt;Node&gt; r = new ArrayList&lt;Node&gt;(); NodeList children = node.getChildNodes(); int l = children.getLength(); for( int i = 0; i &lt; l; ++i ){ if( name.equals( children.item(i).getNodeName() ) ) r.add( children.item(i) ); } return r; } </code></pre>
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