Improper Restriction of XML EER for TransformerFactory

Question

Getting Veracode vulnerability "Improper Restriction of XML External Entity Reference" for "TransformerFactory", There are several solution for this and the most relevant I found is: solution. But after trying these solution none of them worked. Below is the code:

import net.sf.saxon.TransformerFactoryImpl;
.....
 TransformerFactory genericFactory = TransformerFactoryImpl.newInstance();
 genericFactory.setFeature("http://javax.xml.XMLConstants/property/accessExternalDTD", false);  
 genericFactory.setFeature(Constants.FEATURE_SECURE_PROCESSING,true);

The error is:

javax.xml.transform.TransformerConfigurationException: Unsupported TransformerFactory feature: http://javax.xml.XMLConstants/property/accessExternalDTD

Currently I am running the application on Java 8 and the relevant jars are: saxon9.jar, xalan-2.7.2.jar

I tried several combination for these like:

//1
 TransformerFactory genericFactory = javax.xml.transform.TransformerFactory.newInstance();
 genericFactory.setFeature("http://javax.xml.XMLConstants/property/accessExternalDTD", false);  
//2
 TransformerFactory genericFactory = com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newInstance();
 genericFactory.setFeature("http://javax.xml.XMLConstants/property/accessExternalDTD", false);

But getting the same error. How to solve this error?