12 Replies Latest reply: Feb 2, 2012 11:39 AM by tsuji RSS

    XML schema Validation issue when validating a correct new Document in memor

    914707
      So I have found a possible error within the validation or document library

      Here is my code to replicate the problem (Yes, I know it is long)
      package Classes;
      
      
      import java.io.File;
      import java.io.IOException;
      import java.io.StringWriter;
      
      import javax.xml.XMLConstants;
      import javax.xml.parsers.DocumentBuilder;
      import javax.xml.parsers.DocumentBuilderFactory;
      import javax.xml.transform.OutputKeys;
      import javax.xml.transform.Transformer;
      import javax.xml.transform.TransformerConfigurationException;
      import javax.xml.transform.TransformerException;
      import javax.xml.transform.TransformerFactory;
      import javax.xml.transform.TransformerFactoryConfigurationError;
      import javax.xml.transform.dom.DOMSource;
      import javax.xml.transform.stream.StreamResult;
      import javax.xml.validation.Schema;
      import javax.xml.validation.SchemaFactory;
      import javax.xml.validation.Validator;
      
      import org.w3c.dom.Document;
      import org.w3c.dom.Element;
      import org.w3c.dom.Node;
      import org.w3c.dom.NodeList;
      import org.xml.sax.ErrorHandler;
      import org.xml.sax.SAXException;
      import org.xml.sax.SAXParseException;
      
      public class ReplicationBugValidationWithNewDom {
           
           
           //Appends an item to a node in a document given the item as a string and the text to associate to that item.
           private Element append(Document doc, Element element, String item, String text) {
                Element temp = null;
                if(element == null) {return null;}
                temp = doc.createElement(item);
                if(text != null) {
                     temp.appendChild(doc.createTextNode(text));
                }
                element.appendChild(temp);
                return temp;
           }
           
           //Reproduces a bug found in jaxp where a new document is built without a template, but 
           //is unable to validate the file to the schema correctly due to some bug (when the document is valid to the schema).
           //A work around is to avoid using the validator method, convert the document to an inputstream,
           //and "reparse" the document in the builder factory after attaching a schema to the parser.
           
           
           //This relies on the AddressSchema.xsd file within the XMLFiles dir.  
           public ReplicationBugValidationWithNewDom() throws IOException, SAXException, TransformerConfigurationException, TransformerFactoryConfigurationError {
                Document doc = null;
                DocumentBuilder db = null;
                final String JAXP_SCHEMA_SOURCE = 
                     "http://java.sun.com/xml/jaxp/properties/schemaSource";
                String filePath = new File(".").getCanonicalPath();
                filePath+="/XMLFiles/";
                File schemaFile = new File(filePath + "AddressSchema.xsd");
                Element root = null;
                Element name = null;
                
                try {                         
                     //Build a document parser
                     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                     dbf.setNamespaceAware(true);     
                     //Set up schema for factory
                     dbf.setAttribute(JAXP_SCHEMA_SOURCE, schemaFile);
                     db = dbf.newDocumentBuilder();
                     doc = db.newDocument();     
                } catch (Exception e) {
                     System.out.println(e.getMessage());
                }
                
                //Add items to doc in order to validate with schema.
                try {
                     
                     root = doc.createElement("address");
                     doc.appendChild(root);
                     
                     //Hardcode - Grab items from list and put into DOM
                     name = append(doc, root, "name", null);
                     append(doc, name, "title", "Mr." );                 
                     append(doc, name, "first-Name", "Billy");   
                     append(doc, name, "last-Name", "Madison" );  
                     append(doc, root, "street", "111 blah street" ); 
                     append(doc, root, "city", "Cashville" );   
                     append(doc, root, "state", "VA" );  
                     append(doc, root, "postal-code", "99933-2244");  
                      
                } catch (Exception e) {
                     System.out.println(e.getMessage());
                } 
                
                // build an XSD-aware SchemaFactory
                SchemaFactory schemaFactory = SchemaFactory.newInstance( XMLConstants.W3C_XML_SCHEMA_NS_URI );
      
                // hook up ErrorHandler implementation.
                schemaFactory.setErrorHandler(new ErrorHandler() {
                     @Override
                     public void error(SAXParseException ex) throws SAXException {  throw ex;}
                     @Override
                     public void fatalError(SAXParseException ex) throws SAXException {  throw ex;}
                     @Override
                     public void warning(SAXParseException ex)throws SAXException {  throw ex;}
                     
                });
      
                // get the custom xsd schema describing the required format for my XML files.
                Schema schemaXSD = schemaFactory.newSchema( schemaFile );
      
                // Create a Validator capable of validating XML files according to my custom schema.
                Validator validator = schemaXSD.newValidator();
                
                //confirm root "address" exists
                NodeList nl = doc.getElementsByTagName("address");
                Node n = nl.item(0);
                System.out.println("Before validation, Document has " + n.getNodeName().toString());
                
                //Output entire document object to system out
                Transformer t = TransformerFactory.newInstance().newTransformer();
                t.setOutputProperty(OutputKeys.INDENT, "yes");
                
                //Convert to string writer
                StreamResult result = new StreamResult(new StringWriter());
                DOMSource source = new DOMSource(doc);
                
                //Transform to string
                try {
                     t.transform(source, result);
                } catch (TransformerException e1) {
                     // TODO Auto-generated catch block
                     e1.printStackTrace();
                }
                
                //Copy result to string and print
                String xmlString = result.getWriter().toString();
                System.out.println(xmlString);
                
                //The problem below here fails.
                try {
                     validator.validate(new DOMSource (doc));
                } catch (Exception e) {
                     System.err.println(e.getMessage());
                }
                
           }
           
           public static void main (String args[]) throws IOException, SAXException {
                
                try {
                     ReplicationBugValidationWithNewDom d = new ReplicationBugValidationWithNewDom();                         
                } catch (Exception e) {
                     e.printStackTrace();
                }
                return;
           }
      
      }
      The Output:

      Before validation, Document has address
      <?xml version="1.0" encoding="UTF-8"?><address>
      <name>
      <title>Mr.</title>
      <first-Name>Billy</first-Name>
      <last-Name>Madison</last-Name>
      </name>
      <street>111 blah street</street>
      <city>Cashville</city>
      <state>VA</state>
      <postal-code>99933-2244</postal-code>
      </address>
      cvc-elt.1: Cannot find the declaration of element 'address'.


      In the code, you notice that I add to the document object correctly and after converting the document object to a string, it does print out that it has all the correct tags. However, it can not find the address "root" element.


      Thoughts?

      Here is AddressSchema.xsd:

      <?xml version="1.0" encoding="UTF-8"?>
      <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <xsd:element name="address">
      <xsd:complexType>
      <xsd:sequence>
      <xsd:element ref="name"/>
      <xsd:element ref="street"/>
      <xsd:element ref="city"/>
      <xsd:element ref="state"/>
      <xsd:element ref="postal-code"/>
      </xsd:sequence>
      </xsd:complexType>
      </xsd:element>

      <xsd:element name="name">
      <xsd:complexType>
      <xsd:sequence>
      <xsd:element ref="title" minOccurs="0" maxOccurs="1"/>
      <xsd:element ref="first-Name"/>
      <xsd:element ref="last-Name"/>
      </xsd:sequence>
      </xsd:complexType>
      </xsd:element>

      <xsd:element name="title" type="xsd:string"/>
      <xsd:element name="first-Name" type="xsd:string"/>
      <xsd:element name="last-Name" type="xsd:string"/>
      <xsd:element name="street" type="xsd:string"/>
      <xsd:element name="city" type="xsd:string"/>

      <xsd:element name="state">
      <xsd:simpleType>
      <xsd:restriction base="xsd:string">
      <xsd:length value="2"/>
      </xsd:restriction>
      </xsd:simpleType>
      </xsd:element>

      <xsd:element name="postal-code">
      <xsd:simpleType>
      <xsd:restriction base="xsd:string">
      <xsd:pattern value="[0-9]{5}(-[0-9]{4})?"/>
      </xsd:restriction>
      </xsd:simpleType>
      </xsd:element>
      </xsd:schema>

      Once again, I apologize for the shotgun blast of code.

      Edited by: 911704 on Feb 1, 2012 12:18 PM

      Edited by: 911704 on Feb 1, 2012 12:24 PM