Is it possible to show a custom error message in a custom login module with JAAS in EAP 6.4?

Issue

• Is it possible show a different message error for each throw in a custom login module with JAAS in EAP 6.4?

• With the follow LoginModule is it possible to show the throw message in the client.

public class CustomLoginModule implements LoginModule {

    Subject subject = null;
    CallbackHandler callbackHandler = null;
    Map<String, ?> sharedState = null;
    Map<String, ?> options = null;

    private String username;
    private char[] password;

    public void initialize(Subject subject, CallbackHandler callbackHandler, Map<String, ?> sharedState, Map<String, ?> options) {

        this.subject = subject;
        this.callbackHandler = callbackHandler;
        this.sharedState = sharedState;
        this.options = options;
    }

    public boolean login() throws LoginException {

        if (callbackHandler == null) {
            throw new LoginException("Error: no CallbackHandler available "
                    + "to garner authentication information from the user");
        }

        Callback[] callbacks = new Callback[2];
        callbacks[0] = new NameCallback("username");
        callbacks[1] = new PasswordCallback("password: ", false);

        try {

            callbackHandler.handle(callbacks);
            username = ((NameCallback) callbacks[0]).getName();
            password = ((PasswordCallback) callbacks[1]).getPassword();

            System.out.println("Username: " + username + " Password: " + password.toString());

        } catch (java.io.IOException ioe) {

            throw new LoginException(ioe.toString());

        } catch (UnsupportedCallbackException uce) {
            throw new LoginException("Error: " + uce.getCallback().toString()
                    + " not available to garner authentication information "
                    + "from the user");

        } catch (Exception e) {
            throw new LoginException(e.getMessage());
                }
        return false;
    }
// ...
}