Program: 65973
Project: 65973
Buggy source:
public void startElement(String namespaceURI,String localName,String qName,Attributes atts) throws SAXException {
  if (null != namespaceURI && namespaceURI.length() == 0) {
    namespaceURI=null;
  }
  Element element=getInitializedDocument().createElementNS(namespaceURI,qName);
  Node parentNode=nodes.get(nodes.size() - 1);
  if ((stringBuffer.length() > 0) && !(nodes.size() == 1)) {
    Text text=getInitializedDocument().createTextNode(stringBuffer.toString());
    parentNode.appendChild(text);
    stringBuffer.reset();
  }
  appendChildNode(parentNode,element);
  nodes.add(element);
  if (namespaceDeclarations != null) {
    Iterator namespacePrefixes=namespaceDeclarations.keySet().iterator();
    String prefix;
    String uri;
    while (namespacePrefixes.hasNext()) {
      prefix=(String)namespacePrefixes.next();
      uri=(String)namespaceDeclarations.get(prefix);
      addNamespaceDeclaration(element,prefix,uri);
    }
    namespaceDeclarations=null;
  }
  int numberOfAttributes=atts.getLength();
  String attributeNamespaceURI;
  for (int x=0; x < numberOfAttributes; x++) {
    attributeNamespaceURI=atts.getURI(x);
    if (null != attributeNamespaceURI && attributeNamespaceURI.length() == 0) {
      attributeNamespaceURI=null;
    }
    if (attributeNamespaceURI == null && atts.getQName(x).startsWith(XMLConstants.XMLNS + "String_Node_Str")) {
      attributeNamespaceURI=XMLConstants.XMLNS_URL;
    }
    String value=atts.getValue(x);
    element.setAttributeNS(attributeNamespaceURI,atts.getQName(x),value);
  }
}

Fixed version (ground truth):
public void startElement(String namespaceURI,String localName,String qName,Attributes atts) throws SAXException {
  if (null != namespaceURI && namespaceURI.length() == 0) {
    namespaceURI=null;
  }
  Element element=getInitializedDocument().createElementNS(namespaceURI,qName);
  Node parentNode=nodes.get(nodes.size() - 1);
  if ((stringBuffer.length() > 0) && !(nodes.size() == 1)) {
    Text text=getInitializedDocument().createTextNode(stringBuffer.toString());
    parentNode.appendChild(text);
    stringBuffer.reset();
  }
  appendChildNode(parentNode,element);
  nodes.add(element);
  if (namespaceDeclarations != null) {
    Iterator namespacePrefixes=namespaceDeclarations.keySet().iterator();
    String prefix;
    String uri;
    while (namespacePrefixes.hasNext()) {
      prefix=(String)namespacePrefixes.next();
      uri=(String)namespaceDeclarations.get(prefix);
      boolean prefixEmpty=prefix.length() == 0;
      String elemNamespaceURI=element.getNamespaceURI();
      boolean elementNamespaceNull=elemNamespaceURI == null;
      boolean elementNamespaceEmpty=elemNamespaceURI != null && elemNamespaceURI.length() == 0;
      boolean isRootElement=element.getParentNode().getNodeType() == Node.DOCUMENT_NODE;
      if (prefixEmpty && isRootElement && (elementNamespaceEmpty || elementNamespaceNull)) {
      }
 else {
        addNamespaceDeclaration(element,prefix,uri);
      }
    }
    namespaceDeclarations=null;
  }
  int numberOfAttributes=atts.getLength();
  String attributeNamespaceURI;
  for (int x=0; x < numberOfAttributes; x++) {
    attributeNamespaceURI=atts.getURI(x);
    if (null != attributeNamespaceURI && attributeNamespaceURI.length() == 0) {
      attributeNamespaceURI=null;
    }
    if (attributeNamespaceURI == null && atts.getQName(x).startsWith(XMLConstants.XMLNS + "String_Node_Str")) {
      attributeNamespaceURI=XMLConstants.XMLNS_URL;
    }
    String value=atts.getValue(x);
    element.setAttributeNS(attributeNamespaceURI,atts.getQName(x),value);
  }
}