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

According to the spec :
 In XPath.evaluate(java.lang.String expression,java.lang.Object item,QName returnType)  ,  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

-----------------------------------
java -version
java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b37)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b37, mixed mode)
-----------------------------------
javac Test1.java
java Test1
Test1/checkXPath09() : OK  : 3.0
Test1/checkXPath09() : Failed - expected XPathExpressionException not thrown ::

Testcase - Test1.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 org.w3c.dom.Document;

import java.io.File;


public class Test1 {
   
   Document document1 = null;
   
   Test1 () {}
    
    // main()
    public static void main(String[] argv) {
        Test1 test1 = new Test1();
        test1.checkXPath09();
    } 
    // end main()

    // test for XPath.evaluate(java.lang.String expression, java.lang.Object item, QName returnType) , returnType is String
    // 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 checkXPath09() {
    	try{
    	  XPathFactory xpathFactory = XPathFactory.newInstance();
    	  if( xpathFactory instanceof XPathFactory ){
    	     XPath xpath = xpathFactory.newXPath();
	     if ( xpath instanceof XPath ){
		String expression1 = "1+2";
		Double result = (Double)xpath.evaluate(expression1, document1, XPathConstants.NUMBER);
		System.out.println("Test1/checkXPath09() : OK  : "+result);
		String expression2 = "/widgets/widget[@name='a']/@quantity" ;
		String quantity = (String)xpath.evaluate(expression2, document1, XPathConstants.STRING);
		System.out.println("Test1/checkXPath09() : Failed - expected XPathExpressionException not thrown :"+quantity+":");
	     }
    	     else{
    	        System.out.println("checkXPath09() failed - xpath not instance of XPath");
    	     }    	  
    	  }else{
    	      System.out.println(" checkXPath09() failed - creating instance of XPathFactory ");
    	  }  
    	}catch(NullPointerException npe ){
    	  System.out.println(" checkXPathFactory09() - failed ,  NPE thrown ");
    	}catch(XPathFactoryConfigurationException xpfce ){
    	  System.out.println(" checkXPathFactory09() - failed , Default object model not available ");
    	}catch(XPathExpressionException xpee ){
    	  System.out.println(" checkXPathFactory09() - passed , expected XPathExpressionException thrown ");
    	}catch(Exception e){
    	 System.out.println(" Exception thrown - checkXPath09() failed ");
    	}
    }
}


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This bug is mostly fixed , now there are only a few contexts 
which don't throw an exception (such as when the context is ".")

lowering the priority of this bug to a P4 given
that it currently is mostly fixed and this bug seems to deal 
with just a corner case .