Autenticazione su LDAP tramite Active Directory

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;

Hashtable env= new Hashtable(11);
env.put(Context.SECURITY_PRINCIPAL,"CN=kiran,OU=LinkedgeOU,DC=LINKEDGEDOMAIN"); env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldap://:389");
env.put(Context.SECURITY_AUTHENTICATION, "simple");
//username

env.put(Context.SECURITY_PRINCIPAL, );
//password
env.put(Context.SECURITY_CREDENTIALS, password);

try {
DirContext ctx = new InitialDirContext(env);
String[] sAttrIDs = new String[2];
Attributes attr = ctx.getAttributes("");
NamingEnumeration ids = attr.getIDs();
}
catch(NamingException e){
System.err.println("Problem getting attribute: " + e);
}