TransformerFactory - system property has to be set somewhere?

I am using java jdk1.3.1 with Tomcat4.1

TransformerFactory tf =
TransformerFactory.newInstance();

gives me an exception of 
java.lang.ClassCastException:
org.apache.xerces.jaxp.SAXParserFactoryImpl

I have tried everything I can think of.

These are the things I have tried:
1. I got the "jaxp-api.jar" file from the java web
services developer pack 3.1 and placed it here:
c:\tomcat4.1\common\lib

2. I placed a file called "jaxp.properties" here:
c:\jdk1.3.1\jre\lib 
with this one line:
javax.xml.transform.TransformerFactory=org.apache.xerces.jaxp.SAXParserFactoryImpl

3. I also tried placing the "jaxp-api.jar" file here:
c:\jdk1.3.1\jre\lib

What should I do?

My whole code snippet is this ==>

DOMSource 	xml = new DOMSource(document);
Source    	xsl = new StreamSource(xslStream);
Result 		result = new StreamResult(output);
TransformerFactory
tf=TransformerFactory.newInstance();
Transformer stylesheet = tf.newTransformer( xsl );
stylesheet.transform( xml, result );


thanks!,
Keith




	
		
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