Autenticação no AD

import java.util.Hashtable;  
import javax.naming.AuthenticationException;  
import javax.naming.Context;  
import javax.naming.NamingException;  
import javax.naming.directory.Attribute;  
import javax.naming.directory.Attributes;  
import javax.naming.directory.DirContext;  
import javax.naming.directory.InitialDirContext;  
  
  
public class Login {  
  
    public static void main(String args []){  
  
        String userName = "cn=xpto,ou=usuarios,ou=SP,ou=Teste,dc=teste,dc=com,dc=br";
        String newPassword = "teste";  
  
        Hashtable authEnv = new Hashtable(11);  
  
        authEnv.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");  
        authEnv.put(Context.PROVIDER_URL, "ldap://AD.com.br:389");  
        authEnv.put(Context.SECURITY_AUTHENTICATION, "simple");  
        authEnv.put(Context.SECURITY_PRINCIPAL, userName);  
        authEnv.put(Context.SECURITY_CREDENTIALS, newPassword);  
  
       try  
        {  
           DirContext authContext = new InitialDirContext(authEnv);  
           System.out.println("Autenticado!");  
  
        }  
        catch (AuthenticationException authEx)  
        {  
        System.out.println("Erro na autenticação! ");  
        authEx.printStackTrace();  
        }  
        catch (NamingException namEx)  
        {  
        System.out.println("Problemas na conexão! ");  
        //namEx.getCause().printStackTrace();  
        }  
    }  
  
}