Java - How to find which jar file is referring for a specific class

CheckJar.java

import java.util.Properties;

public class CheckJar {

  public static void main(String[] args) {

		Properties prop = System.getProperties();

		System.out.println("Classpath : " + prop.getProperty("java.class.path"));
		System.out.println("JVM name : "+ prop.getProperty("java.vm.specification.name"));

		try {
			Class clazz = Class.forName("javax.mail.Transport");//provide your class name

			if (clazz == null
					|| clazz.getProtectionDomain() == null
					|| clazz.getProtectionDomain().getCodeSource() == null
					|| clazz.getProtectionDomain().getCodeSource()
							.getLocation() == null) {
				System.out.println("Not found!");
			} else {
				System.out.println(clazz.getProtectionDomain().getCodeSource()
						.getLocation().toString());
			}

		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}

	}

}