String user1Name = "test";
 String user1Credentials = "testPassword";
 Pam pam = new Pam();
 boolean authenticated = pam.authenticateSuccessful(user1Name, user1Credentials));

 LoginContext loginContext = new LoginContext("net-sf-jpam", new JpamCallbackHandler());
 loginContext.login();
 loginContext.login();
 /**
 * The application must implement the CallbackHandler.
 * <p/>
 * <p> This application is text-based. Therefore it displays information
 * to the user using the OutputStreams System.out and System.err,
 * and gathers input from the user using the InputStream, System.in.
 */
 class JpamCallbackHandler implements CallbackHandler {
 /**
 * Invoke an array of Callbacks.
 * <p/>
 * <p/>
 *
 * @param callbacks an array of <code>Callback</code> objects which contain
 * the information requested by an underlying security
 * service to be retrieved or displayed.
 * @throws java.io.IOException if an input or output error occurs. <p>
 * @throws UnsupportedCallbackException if the implementation of this
 * method does not support one or more of the Callbacks
 * specified in the <code>callbacks</code> parameter.
 */
 public void handle(Callback[] callbacks)
 throws IOException, UnsupportedCallbackException {
 for (int i = 0; i < callbacks.length; i++) {
 if (callbacks[i] instanceof TextOutputCallback) {
 // display the message according to the specified type
 TextOutputCallback toc = (TextOutputCallback) callbacks[i];
 switch (toc.getMessageType()) {
 case TextOutputCallback.INFORMATION:
 System.out.println(toc.getMessage());
 break;
 case TextOutputCallback.ERROR:
 System.out.println("ERROR: " + toc.getMessage());
 break;
 case TextOutputCallback.WARNING:
 System.out.println("WARNING: " + toc.getMessage());
 break;
 default:
 throw new IOException("Unsupported message type: "
 + toc.getMessageType());
 }
 } else if (callbacks[i] instanceof NameCallback) {
 // prompt the user for a username
 NameCallback nc = (NameCallback) callbacks[i];
 nc.setName(user1Name);
 } else if (callbacks[i] instanceof PasswordCallback) {
 // prompt the user for sensitive information
 PasswordCallback pc = (PasswordCallback) callbacks[i];
 pc.setPassword(callbackCredentials.toCharArray());
 } else {
 throw new UnsupportedCallbackException
 (callbacks[i], "Unrecognized Callback");
 }
 }
 }
 }