XML schema validation program error

[Priety Sharma]

I have a program to apply xml schema to an xml using the validaition api.

I am using jre 1.6

import are as follows:

import javax.xml.*;
import javax.xml.parsers.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.sax.*;

import javax.xml.transform.*;
import javax.xml.transform.stream.*;

import javax.xml.validation.*; 
import java.io.*;

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

The line/statement throwing the error is as follows:

 SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

The exception is:
java.lang.NoClassDefFoundError: javax/xml/validation/SchemaFactory

Priety.

[Sagar Rohankar]

java.lang.NoClassDefFoundError: javax/xml/validation/SchemaFactory

Classpath problem and nedded JAR files are:
http://www.findjar.com/class/javax/xml/validation/SchemaFactory.html

[Priety Sharma]

Sagar thanks.

My code is now running.
New problems now.

My xsd is as follows:

<?xml version="1.0"?> 
<xsd:schema
     xmlns:xsd="http://www.w3.org/2001/XMLSchema"
	 xmlns="http://www.w3.org/2001/XMLSchema"
	 targetNamespace="http://www.w3.org/2001/XMLSchema"
	 elementFormDefault="qualified"
	 attributeFormDefault="unqualified" >



<xsd:complexType name="pen"> 
<xsd:sequence> 
<xsd:element name="color" type="string" /> 
</xsd:sequence> 
</xsd:complexType>
</xsd:schema> 

My xml is as follows:

<?xml version="1.0"?>
<pen>
  <color>100</color>
</pen>

I run my code and get the following exception:

org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'pen'.

How to get around this.
I have mentioned the pen element in the schema.

Also.
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified"

Do I need to mention: http://www.w3.org/2001/XMLSchema as the namespace.
Would something else work in there?
I read somewhere that its just a string.
The namespace thing is getting too confusing.
Do I need to associate with a namespace when my xsd is on machine.
What is the namespace saving me from.
What is the use of mentioning a namespace url if my machine is not connected to the network?

Priety.

[Sagar Rohankar]

First of all, UseCodeTags

Priety Sharma wrote:
I run my code and get the following exception:

org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'pen'.

Clearly, in your schema file you haven't define the element "pen", you can define like this:

<xs:element name="pen">
    <your comple type defination>
</xs:element>

The namespace thing is getting too confusing.
Do I need to associate with a namespace when my xsd is on machine.
What is the namespace saving me from.
What is the use of mentioning a namespace url if my machine is not connected to the network?

All this doubt can be answered by simple Googleing and namespace has nothing to do with networks, its just like a "package name" assigned to differentiate the other elements with same name.

[Priety Sharma]

Yes,

I am now using code tags.
Still continue to get the following error:

org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'pen'.

The xml and the schema now look like this:

XML:

<?xml version="1.0"?>
<pen>
</pen>

XSD/Schema:

<?xml version="1.0"?> 
<xsd:schema
     xmlns:xsd="http://www.w3.org/2001/XMLSchema"
	 xmlns="http://www.w3.org/2001/XMLSchema"
	 targetNamespace="http://www.w3.org/2001/XMLSchema"
	 elementFormDefault="qualified"
	 attributeFormDefault="unqualified">


<xsd:element name="pen"> 
</xsd:element>
</xsd:schema> 

Why is it now working now.
Clearly I have defined the pen element now.
Also I have made the XML with a single element pen and the schema also simply specifies the pen element.
What wrong this time?

[Sagar Rohankar]

Well, its my guess, but give it a try:

<xsd:element name="pen">   
<xsd:complexType>
</xsd:complexType>
</xsd:element>  

and please go through this tutorial for XML schema concepts.
http://www.w3schools.com/Schema/schema_complex_empty.asp

[Priety Sharma]

Hi

Tried what you said but same result.
Finally took a valid xml and xsd example from W3schools.
Passed it to a validator site.
It showed the result as xml is valid.

Provide the paths to the same xml and xsd to the code.
Same end result.

Got this exception again:
org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'shiporder'.

The xml is:

<?xml version="1.0" encoding="ISO-8859-1"?>

<shiporder orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
  <orderperson>John Smith</orderperson>
  <shipto>
    <name>Ola Nordmann</name>
    <address>Langgt 23</address>
    <city>4000 Stavanger</city>
    <country>Norway</country>
  </shipto>
  <item>
    <title>Empire Burlesque</title>
    <note>Special Edition</note>
    <quantity>1</quantity>
    <price>10.90</price>
  </item>
  <item>
    <title>Hide your heart</title>
    <quantity>1</quantity>
    <price>9.90</price>
  </item>
</shiporder>

Thd xsd is:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:element name="shiporder">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="orderperson" type="xs:string"/>
      <xs:element name="shipto">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="name" type="xs:string"/>
            <xs:element name="address" type="xs:string"/>
            <xs:element name="city" type="xs:string"/>
            <xs:element name="country" type="xs:string"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="item" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="title" type="xs:string"/>
            <xs:element name="note" type="xs:string" minOccurs="0"/>
            <xs:element name="quantity" type="xs:positiveInteger"/>
            <xs:element name="price" type="xs:decimal"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attribute name="orderid" type="xs:string" use="required"/>
  </xs:complexType>
</xs:element>

</xs:schema>

Even this is not passed a valid by the code:

So pasting the code for xml validation here:

package xmlschema;


import javax.xml.*;
import javax.xml.parsers.*;
import javax.xml.transform.dom.*;
//import javax.xml.transform.sax.*;

import javax.xml.transform.*;
import javax.xml.transform.stream.*;

import javax.xml.validation.*; //For Validator class
import java.io.*;

import org.w3c.dom.*; //For Document class
import org.xml.sax.SAXException;

public class applyxmlschema {

	/**
	 * @param args
	 */
	
	

	
	public static void main(String[] args) throws SAXException,ParserConfigurationException,IOException{
		// TODO Auto-generated method stub

	    
	    // parse an XML document into a DOM tree
	    DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
	    Document document = parser.parse(new File("D:\\shiporder.xml"));

	    // create a SchemaFactory capable of understanding WXS schemas
	    SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
	    //SchemaFactory factory = new SchemaFactory();

	    // load a WXS schema, represented by a Schema instance
	    Source schemaFile = new StreamSource(new File("D:\\shiporder.xsd"));
	    Schema schema = factory.newSchema(schemaFile);

	    // create a Validator instance, which can be used to validate an instance document
	    Validator validator = schema.newValidator();

	    // validate the DOM tree
	    try {
	        validator.validate(new DOMSource(document));
	    } catch (SAXException e) {
	        // instance document is invalid!
	    	System.out.println("Got a SAXException");
	    	System.out.println(e.getMessage());
	    	e.printStackTrace();
		
	    }		
	    catch(IOException ioe)
	    {
	    	System.out.println("IO Exceptionerror");
	    	System.out.println(ioe.getMessage());
	    }

}

Is this a problem with the java api.
Why is not passing this xml as valid?

[Sagar Rohankar]

Set namespace awareness to true on the DocumentBuilderFactory, like

DocumentBuilderFactory dbFactory=DocumentBuilderFactory.newInstance();
dbFactory.setNamespaceAware(true); // try this

[Priety Sharma]

Sagar Thanks!

That line of code made it work.

Its (the xml) now getting parsed by the xsd.

Thanks a million.
I hope am now able to proceed with learning more xsd rules.

[Sagar Rohankar]

Honestly speaking, I never parsed XML using the Schema, what it really takes me to conclude the answer was a little Googling and API browsing
I hope next time, before posting the question you should do the above two things I had suggested.

[Priety Sharma]

Yes Sagar. I will definitely search better from now onwards.
To tell you the truth I had tried to search info on xml schemas and I should have searched for the code part too. I assumed that the code is 100% correct.

Thanks.