Java 从Stax转换为DOM会导致NullPointerException

我使用StAX读取XML内容，并通过从StAXSource转换到DOMResult将部分内容解析为DOM片段。但是，当任何元素重新定义默认XML命名空间（xmlns=”“）时，这会导致NullPointerException。演示这种情况的最少代码：

String xml =
  "<?xml version=\"1.0\"?>"+
  "<document>"+
  "  <element xmlns=\"\" />"+
  "</document>";

StringReader reader = new StringReader(xml);
XMLInputFactory xif = XMLInputFactory.newFactory();
XMLStreamReader xsr = xif.createXMLStreamReader(reader);

TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();

StAXSource source = new StAXSource(xsr);
DOMResult result = new DOMResult();

t.transform(source,result);

据我所知，输入XML是有效的。Woodstox实现可以毫无问题地转换XML，但如果有办法配置或解决与Java捆绑的默认实现的问题，我不希望向我的应用程序添加更多依赖项。有办法吗？或者这应该被认为是Java默认实现中的错误吗？

使用有效的xml文件

尝试更改代码

   XMLInputFactory xif = XMLInputFactory.newInstance();
          XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("test.xml"));
            xsr.nextTag(); 

            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer t = tf.newTransformer();
            while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) {
                DOMResult result = new DOMResult();
                t.transform(new StAXSource(xsr), result);
                Node domNode = result.getNode();
            }

---

我建议使用SAX，即使使用xmlns=“”也可以正常工作

   XMLInputFactory xif = XMLInputFactory.newInstance();
          XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("test.xml"));
            xsr.nextTag(); 

            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer t = tf.newTransformer();
            while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) {
                DOMResult result = new DOMResult();
                t.transform(new StAXSource(xsr), result);
                Node domNode = result.getNode();
            }

XMLReader xr = XMLReaderFactory.createXMLReader();
Source source = new SAXSource(xr, new InputSource(reader));