GetElementsByTagName not working

Question

I have the following simple piece of code:

String test = "<?xml version="1.0" encoding="UTF-8"?><TT_NET_Result><GUID>9145b1d3-4aa3-4797-b65f-9f5e00be1a30</GUID></TT_NET_Result>" DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); Document doc = dbf.newDocumentBuilder().parse(new InputSource(new StringReader(test))); NodeList nl = doc.getDocumentElement().getElementsByTagName("TT_NET_Result"); 

The problem is that I am not getting any result - the nodelist variable "nl" is empty. What could be wrong?

Answer 1

You are requesting elements under a document element, but TT_NET_Result is a document element. If you just call

 NodeList nl = doc.getElementsByTagName("TT_NET_Result"); 

then I suspect that you will get the desired result.

Answer 2

Here is another answer to this old question. Today I ran into a similar problem in my code, and I really read / write XML all the time. For some reason, I missed one important fact. If you want to use

 NodeList elements = doc.getElementsByTagNameNS(namespace,elementName); 

You need to parse your document with the factory, which will be used for names.

 private static DocumentBuilderFactory getFactory() { if (factory == null){ factory = DocumentBuilderFactory .newInstance(); factory.setNamespaceAware(true); } return factory; }