Saxon

You've created a Configuration (as distinct from a ProfessionalConfiguration or EnterpriseConfiguration); that won't give access to any PE or EE features and therefore doesn't have the ability to load license files.

I'd recommend

Processor proc = new Processor(true);
proc.setConfigurationProperty(....);

actually with this saxon-ee lib , we are trying to call external jar methods by specifying jar in xslt file like this :

<xsl:stylesheet version="2.0"
     xmlns:fib="java:com.company.Main" >

<xsl:template match="/">
test value: <xsl:value-of select="fib:testMethod()"/>

  </xsl:template>

</xsl:stylesheet>

this is the jar class imp:

package com.company;

public class Main {

    public static void main(String[] args) {
	// write your code here
    }

    public static void testMethod() {
        System.out.println("testMethod Main");
    }
}

but after running all this code :

   Processor processor = new Processor(true);
            processor.setConfigurationProperty(Feature.LICENSE_FILE_LOCATION,"C:/Users/shchaudhary/Downloads/saxon-license.lic");
            processor.setConfigurationProperty(Feature.ALLOW_EXTERNAL_FUNCTIONS,true);
            processor.setConfigurationProperty(Feature.TRACE_EXTERNAL_FUNCTIONS, true);
            XsltCompiler compiler = processor.newXsltCompiler();
            XsltExecutable stylesheet = compiler.compile(new StreamSource(new File("C:/Users/shchaudhary/Downloads/org.microsoft.functions.xslt/Artifacts/MapWithXslt20Function.xslt")));
            StringWriter writer = new StringWriter();
            Serializer out = processor.newSerializer(writer);
            out.setOutputProperty(Serializer.Property.METHOD, "xml");
            out.setOutputProperty(Serializer.Property.INDENT, "yes");
            Xslt30Transformer transformer = stylesheet.load30();
            transformer.transform(new StreamSource(new File("C:/Users/shchaudhary/Downloads/org.microsoft.functions.xslt/Artifacts/MapWithXslt20FunctionInput.xml")), out);

I am getting this error:

[2021-12-02T04:07:27.865Z] The class com.company.Main could not be loaded: com.company.Main

[2021-12-02T04:07:27.865Z] Error in {fib:testMethod()} at char 0 in xsl:value-of/@select on line 35 column 58 of MapWithXslt20Function.xslt:

[2021-12-02T04:07:27.865Z] XPST0017 Cannot find a 0-argument function named Q{java:com.company.Main}testMethod().

[2021-12-02T04:07:27.865Z] Cannot load Java class java:com.company.Main. For diagnostics on calls to Java methods,

[2021-12-02T04:07:27.866Z] use the -TJ command line option or set the Configuration property

[2021-12-02T04:07:27.866Z] FeatureKeys.TRACE_EXTERNAL_FUNCTIONS

package com.company;

public class Main {

    public static void main(String[] args) {
	// write your code here
    }

    public static String testMethod() {
        //System.out.println("testMethod Main");
        return "testMethod";
    }
}

The error " The class com.company.Main could not be loaded: com.company.Main" means that this class was not found on the classpath.

How did you invoke your application, and how did you set up the classpath?