The following unit test:

  public void testDTDWithNoInternalSubset() throws Exception
  {
    String xml = "<!DOCTYPE name><a><b/></a>";
    //String xml = "<!DOCTYPE name []><a><b/></a>"; //(this works)
    XMLInputFactory factory = XMLInputFactory.newInstance();
    XMLStreamReader r = factory.createXMLStreamReader( new StringReader(
xml ) );
    r.next(); // NullPointerException thrown
    r.require( XMLStreamReader.DTD, null, null );
  }

Produces the following stack trace:

java.lang.NullPointerException
at com.sun.xml.stream.XMLDocumentScannerImpl$PrologDriver.next
(XMLDocumentScannerImpl.java:965)
at com.sun.xml.stream.XMLDocumentScannerImpl.next
(XMLDocumentScannerImpl.java:353)
at com.sun.xml.stream.XMLReaderImpl.next(XMLReaderImpl.java:557)

The XML specification permits a DTD to neither point to an external subset nor
contain an internal subset:

'<!DOCTYPE' S Name (S ExternalID)? S? ('[' intSubset ']' S?)? '>'

Therefore <!DOCTYPE name> should be allowed.------- Additional comments from spericas Wed Feb 28 20:26:01 +0000 2007 -------

Looks like an issue in the scanner that needs investigation.------- Additional comments from spericas Fri Mar 2 15:17:23 +0000 2007 -------

Problem is fixed and it wasn't in the scanner. It was just simple unguarded
method call whose object reference was null in this case.