How to verify the SAX (Simple API for XML) implementation class information?

If you want to verify the SAX (Simple API for XML) implementation class information, you can try the following example program:

// Copyright (c) 2017 FYIcenter.com
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;

public class SaxClassInfo {
   public static void main(String[] args) throws Exception {
      SAXParserFactory f = SAXParserFactory.newInstance();
      SAXParser p = f.newSAXParser();
      
      System.out.println("SAX class info:");
      System.out.println("   Factory: "+f.getClass().getName());
      System.out.println("   Parser: "+p.getClass().getName());
   }
}

Compile and run it with Java SE 8 SDK:

>\fyicenter\jdk-1.8.0\bin\javac SaxClassInfo.java

>\fyicenter\jdk-1.8.0\bin\java SaxClassInfo
SAX class info:
   Factory: com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl
   Parser: com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl

Run it again with Apache Xerces 2.11.0 xercesImpl.jar provided:

>\fyicenter\jdk-1.8.0\bin\java 
   -cp .;\fyicenter\xerces-2_11_0\xercesImpl.jar; SaxClassInfo
SAX class info:
   Factory: org.apache.xerces.jaxp.SAXParserFactoryImpl
   Parser: org.apache.xerces.jaxp.SAXParserImpl

The output tells you that the default implementation of SAX in Java SE 8 JDK is the Apache Xerces 2.7.1 package. And you can override it with Apache Xerces 2.11.0 by specifiying the JAR file to the -cp option.

You can confirm Apache Xerces version numbers as desribed below:

>\fyicenter\jdk-1.8.0\bin\java 
   com.sun.org.apache.xerces.internal.impl.Version

Xerces-J 2.7.1

>\fyicenter\jdk-1.8.0\bin\java 
   -cp .;\fyicenter\xerces-2_11_0\xercesImpl.jar 
   org.apache.xerces.impl.Version

Xerces-J 2.11.0

⇒Using XML SAX API with Apache Xerces

⇒⇒FAQ for Apache Xerces XML Parser