[jira] Commented: (XERCESJ-1163) javax.xml.validation.Validator#validate implementation does not support a DOMSource argument

["Ortwin Glück (JIRA)" <xe...@xml.apache.org>]

    [ http://issues.apache.org/jira/browse/XERCESJ-1163?page=comments#action_12412895 ] 

Ortwin Glück commented on XERCESJ-1163:
---------------------------------------

Thanks Michael for this excellent explanation. I have a use case that is a bit special and I am not sure if this is a Xerces or a JDOM problem.

I create a JDOM with all nodes in NO_NAMESPACE (structure is defined by customer). This JDOM is subsequently converted to a Xerces DOM with the JDOM's DOMOutputter. This would use Document.createElement instead of Document.createElementNS to create the Elements for example as I use NO_NAMESPACE. This way I always get a DOM without namespace support. Now I want to validate this DOM against a schema (provided by the customer). The schema does not declare a target namespace. And the XML files reference it with noNamespaceSchemaLocation. This seems legal to me. But with no namespace support in the DOM I can not use the schema validation due to this issue.

Would it be possible to use createElementNS instead here, even though I have no namespace? Then it can be solved in JDOM's DOMOutputter.
If not, then you should think about how to validate a DOM with no namespace :-)

> javax.xml.validation.Validator#validate implementation does not support a DOMSource argument
> --------------------------------------------------------------------------------------------
>
>          Key: XERCESJ-1163
>          URL: http://issues.apache.org/jira/browse/XERCESJ-1163
>      Project: Xerces2-J
>         Type: Bug

>   Components: JAXP (javax.xml.validation)
>     Versions: 2.8.0
>     Reporter: Steven Grossman

>
> Validator#validate implementation does not support a DOMSource argument.  The following SAXParseException is always thrown: 
> Exception in thread "main" org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'xxx'.  
> The problem is not seen in the 1.5 jdk.
> I've supplied a test class that succesfully validates an xml instance document using a StreamSource and subsequently fails to perform the validation against a DOMSource representation of the same xml.
> import java.io.StringReader;
> import java.io.IOException;
> import javax.xml.XMLConstants;
> import javax.xml.parsers.DocumentBuilder;
> import javax.xml.parsers.DocumentBuilderFactory;
> import javax.xml.parsers.ParserConfigurationException;
> import javax.xml.transform.stream.StreamSource;
> import javax.xml.transform.dom.DOMSource;
> import javax.xml.validation.Schema;
> import javax.xml.validation.SchemaFactory;
> import javax.xml.validation.Validator;
> import org.xml.sax.SAXException;
> import org.xml.sax.InputSource;
> import org.w3c.dom.Document;
> public final class ValidatorBug {
>     private static final String SCHEMA =
>         "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
>         "<xs:schema xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" elementFormDefault=\"qualified\" attributeFormDefault=\"unqualified\">\n" +
>         "    <xs:element name=\"root\"/>\n" +
>         "</xs:schema>";
>     private static final String XML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root/>";
>     public static void main(String[] args) throws SAXException, IOException, ParserConfigurationException {
>         SchemaFactory schemaFactory =
>                 SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
>         Schema schema = schemaFactory.newSchema(new StreamSource(new StringReader(SCHEMA)));
>         Validator validator = schema.newValidator();
>         System.out.println("\nvalidating stream source");
>         validator.validate(new StreamSource(new StringReader(XML)));  // <--- WORKS
>         System.out.println("valid");
>         DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
>         DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
>         Document document = documentBuilder.parse(new InputSource(new StringReader(XML)));
>         System.out.println("\nvalidating DOM source");
>         validator.validate(new DOMSource(document));   // <--- PROBLEM
>         System.out.println("valid");
>     }
> }
> The exception:
> Exception in thread "main" org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'root'.
> 	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
> 	at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
> 	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
> 	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
> 	at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
> 	at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
> 	at org.apache.xerces.jaxp.validation.DOMValidatorHelper.beginNode(Unknown Source)
> 	at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)
> 	at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)
> 	at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source)
> 	at javax.xml.validation.Validator.validate(Validator.java:82)
> 	at ValidatorBug.main(ValidatorBug.java:42)
> (This bug is represented by XERCESJ-1132 and XERCESJ-1161, but they were in the wrong component)

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