Authenticating to the Directory
This example uses the JNDI/LDAP service provider to create an authenticated session to an LDAP server on the local machine, by using "simple" authentication. 

 
 String url = "ldap://localhost/o=JNDITutorial";
 Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY,
  "com.sun.jndi.ldap.LdapCtxFactory");
 env.put(Context.PROVIDER_URL, url);
 env.put(Context.SECURITY_AUTHENTICATION, "simple");
 env.put(Context.SECURITY_PRINCIPAL, "userDN");
 env.put(Context.SECURITY_CREDENTIALS, "secret");
 try {
     DirContext ctx = new InitialDirContext(env);
 } catch (NamingException e) {
 }