FULL PRODUCT VERSION :
C:\Documents and Settings\ndjc>java -version
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
XML validation with schema fails to find the top level element definition using Java 6. It worked with Java 5.

Given the following W3C Schema:
================================================
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:element name="import">
   </xs:element>
</xs:schema>
================================================
and the following instance document:
================================================
<?xml version="1.0" encoding="US-ASCII"?>
<import>
</import>
================================================

validation fails in Java 6 with the following error:

cvc-elt.1: Cannot find the declaration of element 'import'

Might be similar to bug 6465764?

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the enclosed Java program with Java 5 (succeeds) and Java 6 (fails).

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Validation should succeed on Java 6.

ACTUAL -
Validation succeeds with Java 5, and fails with Java 6, with the error message cvc-elt.1: Cannot find the declaration of element 'import'

ERROR MESSAGES/STACK TRACES THAT OCCUR :
cvc-elt.1: Cannot find the declaration of element 'import'

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package validate;

import java.io.*;

import javax.xml.XMLConstants;
import javax.xml.parsers.*;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.*;

import org.w3c.dom.Document;
import org.xml.sax.*;


/**
 * A simple tester for XML validation.
 */
public final class MyValidator
{
    private boolean valid;


    private class ValidatorErrorHandler implements ErrorHandler
    {
        public void fatalError(SAXParseException e) throws SAXException
        {
            throw e;
        }


        public void error(SAXParseException e) throws SAXException
        {
            System.err.printf("Validation error on line %d: %s%n",e.getLineNumber(),
                e.getLocalizedMessage());
            valid = false;
        }


        public void warning(SAXParseException e) throws SAXException
        {
            System.err.printf("Validation warning on line %d: %s%n",e.getLineNumber(),
                e.getLocalizedMessage());
        }
    }


    private void validate()
    {
        try
        {
            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = builderFactory.newDocumentBuilder();
            Document document = builder.parse(new FileInputStream(new File("file.xml")));
            SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Source source = new StreamSource("schema.xsd");
            Schema schema = schemaFactory.newSchema(source);
            Validator validator = schema.newValidator();
            validator.setErrorHandler(new ValidatorErrorHandler());
            valid = true;
            validator.validate(new DOMSource(document));
            if (valid)
            {
                System.out.println("XML validated successfully!");
            }
            else
            {
                System.out.println("XML validation failed");
            }
        }
        catch (Exception e)
        {
            System.out.println("Validation caused an exception");
            e.printStackTrace();
        }

    }


    /**
     * Main entry point for XML validation testing.
     * @param args Command line arguments
     */
    public static void main(String... args)
    {
        new MyValidator().validate();
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Cannot upgrade to Java 6 until this is resolved.

Release Regression From : 5.0
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.

Release Regression From : 5.0
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.

Release Regression From : 5.0
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.