How to pass java.util.Map instance as a parameter to a XSLTStylesheet

Hi,

Apparently, Xalan (the one bundled with JDK 6 at-least) complains when a java.util.Map is passed as a parameter to an XSLT stylesheet. 

Assuming, I have a snippet of code as:

Map inputparam = new HashMap();	
inputparam.put("greeting", "hi there");
transformer.setParameter("inputparam", inputparam);
...
transformer.transform(...);

and I have a simple XSLT that attempts to get the key 'greeting' from this

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:map="xalan://java.util.HashMap"
	extension-element-prefixes="map">
	
	<xsl:param name="inputparam" />
	
	<xsl:template match="/">
		<xsl:variable name="greeting"
			select="map:get($inputparam, 'greeting')" />
		<greeting><xsl:value-of select="greeting"/></greeting>		
	</xsl:template>
</xsl:stylesheet>

I obtain the following error:

ERROR:  'Cannot find external method 'java.util.HashMap.get' (must be public).'
FATAL ERROR:  'Could not compile stylesheet'
javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet
	at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:825)
	at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:614)
	at xalanxslttest.ExecuteXslt.main(ExecuteXslt.java:36)


Is there a way to solve this? Is this supported?

All help/advice appreciated!
Thanks & Regards,
Vishal