Get XML node with namespace in java

Question

I have the next XML:

Answer 1

You need to make sure the XML parser is namespace aware.

You should also make sure to close the FileInputStream, preferably using try-with-resources.

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);

Document doc;
try (InputStream xmlStream = new FileInputStream(PATH_TO_MY_XML)) {
    doc = dbf.newDocumentBuilder().parse(xmlStream);
}
NodeList nodes = doc.getDocumentElement().getElementsByTagNameNS("*", "UBLExtension");