Help needed ! How to find out 'XML Difference' using XDK

I'm using oracle.xml.differ.XMLDiff.
I have set XML files.
Then calling generateXSLFile("somefile")
While running facing :
Exception in thread "main" java.lang.NullPointerException
at oracle.xml.differ.XMLDiff.generateXSL(XMLDiff.java:383)
at oracle.xml.differ.XMLDiff.generateXSLFile(XMLDiff.java:330)
at XMLDiffTest.main(XMLDiffTest.java:38)
Same prob if I use setDocuments(xd1,xd2) ....
What is the way out ?
Does anyone have any sample code ?
TYI
Kaniska

To compare XML documents with the XMLDiff class.
-Add /lib/xml.jar and /lib/xmlparserv2.jar to the Classpath.
-Parse the two documents to be compared with the DOMParser.
DOMParser parser=new DOMParser();
parser.parse("file://c:/xmlFile1.xml");
XMLDocument document1=parser.getDocument();
XMLDocument document2;-Create an object of type XMLDiff
XMLDiff xmlDiff=new XMLDiff(); -Set the documents to be compared.
xmlDiff.setDocuments(document1, document2);-Compare the XML documents.
boolean diff=xmlDiff.diff();If diff is 'true', the documents are different.
-Generate the XSLT for the differences between the XML documents.
xmlDiff.generateXSLFile("diff.xslt");

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