Problem validating schema

[Roopa Bagur]

Guys I really need ur help here..
I am trying to validate a schema file using JAXP1.2.. Here is my code .. I have no clue why I get this error
Schema_reference 4: Failed to read schema document 'null'

//constants
static String JAXP_SCHEMA_LANGUAGE =
"http://java.sun.com/xml/jaxp/properties/schemaLanguage";
static String W3C_XML_SCHEMA =
"http://www.w3.org/2001/XMLSchema";
static final String JAXP_SCHEMA_SOURCE =
"http://java.sun.com/xml/jaxp/properties/schemaSource";

try
{
SAXParserFactory spf = SAXParserFactory.newInstance();
spf.setNamespaceAware(true);
spf.setValidating(true);
SAXParser saxParser = spf.newSAXParser();
try
{
saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
}
catch (SAXNotRecognizedException x)
{
throw new RuntimeException( "Parser doesn't support XML Schema. "+x.getMessage());
}
saxParser.setProperty(JAXP_SCHEMA_SOURCE, new File("c:\\projects\\xml Mssaging\\bin\\XMLSchema.xsd"));
// Validate
XMLReader xmlReader = saxParser.getXMLReader();
errorChecker = new ErrorChecker( verboseErrors );
xmlReader.setErrorHandler( errorChecker );

// Validate
xmlReader.parse(new InputSource(new FileReader(inputFile)));

// If error happened
if ( errorChecker.errorHappened )
{
isValid = false;
// Suggest "verboseerrors" att if not on
if ( ! verboseErrors )
{
System.out.println( "Error. Set SchemaValidate's 'verbose errors' attribute to true for a more detailed description on warnings.");
}
}
}
catch (IOException e)
{
isValid = false;
System.err.println("Error: IO Exception.");
e.printStackTrace();
}
catch (SAXException e)
{
isValid = false;
System.err.println("Error: SAXException.");
e.printStackTrace();
}
catch (ParserConfigurationException e)
{
isValid = false;
System.err.println("Error: ParserConfigurationException.");
e.printStackTrace();
}

I would really appreciate any help...This thing has been bugging me for a few days now..
Thanks,
Roopa

[Anonymous]

Hi Roopa,
I tried your code wich works perfectly for me. The thing that might not be working is the location of the xsd file (this is actually the error reported by your code: failed to read schema document).
All your have to do is check the location of the file. The path "c:\\projects\\xml Mssaging\\bin\\XMLSchema.xsd" might actually be wrong (don't you miss a e in Mssaging for instance?).
Cheers

[Anonymous]

For reference, I used the following files for testing:
- roopa.xml
- roopa.xsd
- Roopa.java
Contents of roopa.xml:

<?xml version="1.0" encoding="utf-8"?>
<roopa posts-where="http://www.javaranch.com">
    <person>
        <first-name>Roopa</first-name>
        <last-name>Bagur</last-name>
    </person>
</roopa>

Contents of roopa.xsd:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="roopa">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="person" minOccurs="0" maxOccurs="unbounded">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="first-name" type="xs:string"/>
              <xs:element name="last-name" type="xs:string" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="posts-where" type="xs:string"/>
    </xs:complexType>
  </xs:element>
</xs:schema>

Contents of Roopa.java:

import org.xml.sax.*;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
/**
 * Created by IntelliJ IDEA.
 * User: Beno�t d'Oncieu
 * Date: Dec 16, 2002
 * Time: 10:53:04 AM
 * To change this template use Options | File Templates.
 */
public class Roopa {
    //constants
    static String JAXP_SCHEMA_LANGUAGE =
            "http://java.sun.com/xml/jaxp/properties/schemaLanguage";
    static String W3C_XML_SCHEMA =
            "http://www.w3.org/2001/XMLSchema";
    static final String JAXP_SCHEMA_SOURCE =
            "http://java.sun.com/xml/jaxp/properties/schemaSource";
    public static void main(String[] args) {
        boolean verboseErrors = false;
        boolean isValid = true;
        File inputFile = new File("src/roopa.xml");
        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            spf.setNamespaceAware(true);
            spf.setValidating(true);
            SAXParser saxParser = spf.newSAXParser();
            try {
                saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
            } catch (SAXNotRecognizedException x) {
                throw new RuntimeException("Parser doesn't support XML Schema. " + x.getMessage());
            }
            saxParser.setProperty(JAXP_SCHEMA_SOURCE, new File("src/roopa.xsd"));
// Validate
            XMLReader xmlReader = saxParser.getXMLReader();
            ErrorChecker errorChecker;
            errorChecker = new ErrorChecker(verboseErrors);
            xmlReader.setErrorHandler(errorChecker);

// Validate
            xmlReader.parse(new InputSource(new FileReader(inputFile)));

// If error happened
            if (errorChecker.errorHappened) {
                isValid = false;
// Suggest "verboseerrors" att if not on
                if (!verboseErrors) {
                    System.out.println("Error. Set SchemaValidate's 'verbose errors' attribute to true for a more detailed description on warnings.");
                }
            }
        } catch (IOException e) {
            isValid = false;
            System.err.println("Error: IO Exception.");
            e.printStackTrace();
        } catch (SAXException e) {
            isValid = false;
            System.err.println("Error: SAXException.");
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            isValid = false;
            System.err.println("Error: ParserConfigurationException.");
            e.printStackTrace();
        }
        if (isValid)
            System.out.println("The file is valid");
    }
}
class ErrorChecker implements ErrorHandler {
    public boolean errorHappened;
    private boolean verboseErrors;
    public ErrorChecker(boolean verboseErrors) {
        super();
        this.verboseErrors = verboseErrors;
    }
    public void warning(SAXParseException e) throws SAXException {
        if (verboseErrors)
            System.err.println("warning at [line=" + e.getLineNumber() + ", col=" + e.getColumnNumber() + "] " + e.getMessage());
        errorHappened = true;
    }
    public void error(SAXParseException e) throws SAXException {
        if (verboseErrors)
            System.err.println("error at [line=" + e.getLineNumber() + ", col=" + e.getColumnNumber() + "] " + e.getMessage());
        errorHappened = true;
    }
    public void fatalError(SAXParseException e) throws SAXException {
        if (verboseErrors)
            System.err.println("fatal error at [line=" + e.getLineNumber() + ", col=" + e.getColumnNumber() + "] " + e.getMessage());
        errorHappened = true;
    }
}

Hope this helps