A DESCRIPTION OF THE REQUEST :
with com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl,We're getting the following stacktrace when compiling a stylesheet with instance method calling on an a xsl parameter. The same code can pass with org.apache.xalan.processor.TransformerFactoryImpl:

ERROR: 'Cannot find external method 'Test.Bam.getMessage.' (must be public).'
FATAL ERROR: javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet
       at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.n
wTemplates(Unknown Source)
       at Test.UseStylesheetParam.main(UseStylesheetParam.java:64)
xception in thread "main" java.lang.NullPointerException
       at Test.UseStylesheetParam.main(UseStylesheetParam.java:78)

JUSTIFICATION :
The same feature has already been in Apache Xalan.


---------- BEGIN SOURCE ----------
foo.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"
  xmlns:Iteration="http://www.iterationsoftware.com"
  xmlns:msxsl="urn:schemas-microsoft-com:xslt"
  xmlns:HTML="http://www.w3.org/Profiles/XHTML-transitional"
  xmlns:xalan="http://xml.apache.org/xalan"
  xmlns:BAM="xalan://Test.Bam">
  <xsl:output method="xml" encoding="UTF-8" omit-xml-declaration="yes" indent="no"/>
  <xsl:param name="param1"/>
  <xsl:variable name="BAMObject" select="$param1"/>
  <xsl:template match="doc">
    <out><xsl:value-of select="BAM:getMessage($BAMObject)"/></out>
  </xsl:template>
</xsl:stylesheet>


foo.xml
<?xml version="1.0"?>
<doc>Hello</doc>


A simple java class.

package Test;

import java.util.Date;

public class Bam
{
  String m_strMessage;

  public Bam()
  {
    m_strMessage = "hello world";
  }

  public Bam(String strMessage)
  {
    m_strMessage = strMessage;
  }

  public String getMessage()
  {
    String strVal = "Hello " + m_strMessage + "! Current time is: " + new Date().toString();
    return strVal;
  }
}


Sample code to transform the foo.xml
 
 // Get the parameter value from the command line.
  Bam oBam = new Bam(args[0]);
  //String paramValue = oBam.toString();
  Bam paramValue = oBam;

  TransformerFactory tFactory = TransformerFactory.newInstance();
  Templates templates = tFactory.newTemplates(new StreamSource("foo.xsl"));

  Transformer transformer = templates.newTransformer();

 transformer.setParameter("param1", /* parameter name */
                            paramValue /* parameter value */ );

  transformer.transform(new StreamSource("foo.xml"), new StreamResult(new OutputStreamWriter(System.out)));

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Create the instance in XSLT instead of Java code.

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"
  xmlns:Iteration="http://www.iterationsoftware.com"
  xmlns:msxsl="urn:schemas-microsoft-com:xslt"
  xmlns:HTML="http://www.w3.org/Profiles/XHTML-transitional"
  xmlns:xalan="http://xml.apache.org/xalan"
  xmlns:BAM="xalan://Test.Bam">
  <xsl:output method="xml" encoding="UTF-8" omit-xml-declaration="yes" indent="no"/>
  <xsl:param name="param1"/>
  <xsl:variable name="BAMObject" select="$param1"/>
   <xsl:variable name="BAMObject2" select="BAM:new()"/>
  <xsl:template match="doc">
    <out><xsl:value-of select="BAM:getMessage($BAMObject2)"/></out>
  </xsl:template>
</xsl:stylesheet>