Simplest possible example of Java authentication to LDAP Server (including Active Directory)

gistfile1.java

import java.util.Hashtable;
import java.io.Console;
import javax.naming.Context;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;


public class TestAuth {

	public static void main(String[] args) {
		TestAuth authentication = new TestAuth();
		try {
		
			// Get the username and password

			Console console = System.console();
		
			String userID = console.readLine("User ID: ");
			String pwd = String.valueOf(console.readPassword("Password? "));


			// set up the LDAP parameters		
			Hashtable<Object, Object> env = new Hashtable<Object, Object>();
			env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
			env.put(Context.PROVIDER_URL, "ldap://your.ad.server.here:389");
			env.put(Context.SECURITY_AUTHENTICATION, "simple");
			env.put(Context.REFERRAL, "follow");
			env.put(Context.SECURITY_PRINCIPAL, userID);
			env.put(Context.SECURITY_CREDENTIALS, pwd);
			
			// attempt to authenticate
			DirContext ctx = new InitialDirContext(env);
			ctx.close();
		
			System.out.println("\n*** Authenticated ***\n");
		
		} catch (Exception e) {
		    // if failure, tell us about errors
			e.printStackTrace();
			
			System.out.println("\n*** Not Authenticated ***\n");

		}
	}
	
	
}

Hi, at line 11 you have defined a reference to and created an unused and void object (except for what he takes from Object superclass) .
You just have defined a static main method for Class TestAuth , so what is the scope of "authentication" variable and his referenced (new) Object?