DTD Validation problem via Sax

[alp carsikarsi]

Hello everybody,

I wrote a http servlet. My servlet getting xml requests over HTTP ,processing xml and sending back to client successfully. But there is a problem about validation via DTD.
I want to validate incoming xmls via DTD.
MY sample DTD : ADD_CLIENT.dtd :
<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT ADD_SERVICE (MESSAGE_ID, XXX_SUBSCRIBER_ID,TEL_NUMBER)>
<!ELEMENT MESSAGE_ID (#PCDATA)>
<!ELEMENT XXX_SUBSCRIBER_ID (#PCDATA)>
<!ELEMENT TEL_NUMBER (#PCDATA)>

Sample Incoming xml :
<?xml version="1.0" encoding="UTF-8"?><ADD_SERVICE><MESSAGE_ID>309832903820923803282 308</MESSAGE_ID><XXX_SUBSCRIBER_ID>134523278</XXX_SUBSCRIBER_ID><TEL_NUMBER>03123445566</TEL_NUMBER></ADD_SERVICE>

But i am getting this exception constantly:

Error:
..
Line: 1
Error: Document root element "ADD_SERVICE", must match DOCTYPE root "null".|#]
..
Line: 1
Error: Document is invalid: no grammar found.|#]

I am changing my dtd and xml. But still i am getting same error. After getting this exception servlet continues its work properly.

Sample Code :

 
public static final String XML_DTD_PATH         = "resources\\ADD_CLIENT.dtd";
..
..
public static Hashtable parseXMLIntoHashTable(String xml) {

        Hashtable ht = new Hashtable();
        InputSource inputSource = new InputSource(new java.io.StringReader(xml));

        System.out.println("path =" + new File(XML_DTD_PATH).getAbsolutePath());
        inputSource.setSystemId(XML_DTD_PATH);

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setValidating(true); //alper
        DocumentBuilder builder = null;
        Document doc = null;

        try {
            builder = factory.newDocumentBuilder();

            builder.setErrorHandler(new org.xml.sax.ErrorHandler() {

                //To handle Fatal Errors
                public void fatalError(SAXParseException exception) throws SAXException {
                    System.out.println("Line: " + exception.getLineNumber() + "\nFatal Error: "
                            + exception.getMessage());
                }

                //To handle Errors
                public void error(SAXParseException e) throws SAXParseException {
                    System.out.println("Line: " + e.getLineNumber() + "\nError: " + e.getMessage());
                }

                //To Handle warnings
                public void warning(SAXParseException err) throws SAXParseException {
                    System.out.println("Line: " + err.getLineNumber() + "\nWarning: "
                            + err.getMessage());
                }
            });

            doc = builder.parse(inputSource);
            DOMSource source = new DOMSource(doc);
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer transformer;
            try {
                transformer = tf.newTransformer();

                transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, XML_DTD_PATH);
                StreamResult result = new StreamResult(System.out);
                transformer.transform(source, result);
            } catch (TransformerConfigurationException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            } catch (TransformerException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            NodeList nodes = doc.getChildNodes();
            for (int i = 0; i < nodes.getLength(); i++) {
                Node node = nodes.item(i);
                parseNode(node, ht);
            }
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            doc = null;
            builder = null;
            factory = null;
            inputSource = null;
        }

        return ht;
    }

[Paul Clapham]

The system isn't finding your DTD. That's because you are providing only a relative path for it and making an incorrect assumption about what the current working directory is when you run that code.

[alp carsikarsi]

I am writing the path before using it. The path seems to be correct. ADD_CLIENT.dtd file is there !

System.out.println("path =" + new File(XML_DTD_PATH).getAbsolutePath());
inputSource.setSystemId(XML_DTD_PATH);

Result in server.log:

path =C:\sailfin\domains\fcsdomain\config\resources\ADD_CLIENT.dtd

Thanks.

[Paul Clapham]

The error messages pretty clearly indicate that your DTD isn't being seen. So now consider the fact that the InputSource.setSystemId method asks for a URL. You aren't passing it a URL. And also, you're supposed to be passing it the system ID of the XML document, not the location of the DTD. I think that would be the file:// URL for the directory containing the DTD.

[Robert Monical]

I have a similar problem moving a stable app from Java 5 to Java 6. The DTD used to be resolved relative to the file system location from which the referencing document was opened. Now it is resolved relative to the location from which the application was started.

Edit: April 4. What I ended up doing was creating a EntityResolver and adding it to the DocumentBuilder.