XPathExpression.evaluate(java.lang.Object item,QName returnType)should throw XPathExpressionException when item is null and expression refers to the context

According to spec :
A null value for item indicates that the expression should be evaluated without a context . In the absence of a context item, simple expressions, such as "1+1", can be evaluated . Any expression that refers to the context will throw an XPathExpressionException

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java -version
java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b38)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b38, mixed mode)

javac Test12.java
java Test12
checkXPathExpression02() : failed - expected XPathExpressionException not thrown ::
checkXPathExpression14() : failed - expected XPathExpressionException not thrown ::

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Testcase - Test12.java
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import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactoryConfigurationException;
import javax.xml.xpath.XPathExpressionException;

import javax.xml.namespace.QName;

import org.w3c.dom.Document;

import org.xml.sax.InputSource;




public class Test12 {

   Document document1 = null;
   
   Test12 () {}
    
    // main()
    public static void main(String[] argv) {
        Test12 xpathExpression01 = new Test12();
        xpathExpression01.checkXPathExpression02();
        xpathExpression01.checkXPathExpression14();
    }// end main()
    
    
     // test for evaluate(java.lang.Object item,QName returnType)throws XPathExpressionException
    // item is null , A null value for item indicates that the expression should be evaluated without a context.
    // In the absence of a context item, simple expressions, such as "1+1", can be evaluated.
    // Any expression that refers to the context will throw an XPathExpressionException
    private void checkXPathExpression02() {
     try{
     XPathFactory xpathFactory = XPathFactory.newInstance();
     if( xpathFactory instanceof XPathFactory ){
     XPath xpath = xpathFactory.newXPath();
if ( xpath instanceof XPath ){
String expression = "/widgets/widget[@name='a']/@quantity" ;
XPathExpression xpathExpression = xpath.compile(expression);
String quantity = (String)xpathExpression.evaluate(document1, XPathConstants.STRING);
System.out.println("checkXPathExpression02() : failed - expected XPathExpressionException not thrown :"+quantity+":");
}
     else{
     System.out.println("checkXPathExpression02() failed - xpath not instance of XPath");
     }
     }else{
     System.out.println(" checkXPathExpression02() failed - creating instance of XPathFactory ");
     }
     }catch(NullPointerException npe ){
     System.out.println(" checkXPathExpression02() - failed , NPE thrown ");
     }catch(XPathFactoryConfigurationException xpfce ){
     System.out.println(" checkXPathExpression02() - failed , Default object model not available ");
     }catch(XPathExpressionException xpee ){
     System.out.println(" checkXPathExpression02() - passed , expected XPathExpressionException thrown ");
     }catch(Exception e){
     System.out.println(" Exception thrown - checkXPathExpression02() failed ");
     }
    }
   
    
    // test for evaluate(java.lang.Object item)throws XPathExpressionException
    // when returnType is left off of the XPath.evaluate method, all expressions are evaluated to a String value.
    // item is null , A null value for item indicates that the expression should be evaluated without a context.
    // In the absence of a context item, simple expressions, such as "1+1", can be evaluated.
    // Any expression that refers to the context will throw an XPathExpressionException
    private void checkXPathExpression14() {
     try{
     XPathFactory xpathFactory = XPathFactory.newInstance();
     if( xpathFactory instanceof XPathFactory ){
     XPath xpath = xpathFactory.newXPath();
if ( xpath instanceof XPath ){
String expression = "/widgets/widget[@name='a']/@quantity" ;
XPathExpression xpathExpression = xpath.compile(expression);
String quantity = (String)xpathExpression.evaluate(document1 );
System.out.println("checkXPathExpression14() : failed - expected XPathExpressionException not thrown :"+quantity+":");
}
     else{
     System.out.println("checkXPathExpression14() failed - xpath not instance of XPath");
     }
     }else{
     System.out.println(" checkXPathExpression14() failed - creating instance of XPathFactory ");
     }
     }catch(NullPointerException npe ){
     System.out.println(" checkXPathExpression14() - failed , NPE thrown ");
     }catch(XPathFactoryConfigurationException xpfce ){
     System.out.println(" checkXPathExpression14() - failed , Default object model not available ");
     }catch(XPathExpressionException xpee ){
     System.out.println(" checkXPathExpression14() - passed , expected XPathExpressionException thrown ");
     }catch(Exception e){
     System.out.println(" Exception thrown - checkXPathExpression14() failed ");
     }
    }
    
}

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