I did a quick fix - I dont know yet if it works:

private Document getDocument(InputStream is) throws DocumentException
{
SAXReader reader = new SAXReader();
EntityResolver entityResolver = new EntityResolver() {
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException

{ return new InputSource(new ByteArrayInputStream("".getBytes())); }

};
reader.setEntityResolver(entityResolver);
return reader.read(is);
}