}
            activityHelper.loginFailure(OptionalThing.of(new LocalUserCredential(username, password)));
            throwValidationError(messages -> messages.addErrorsLoginError(GLOBAL), () -> asIndexPage(form));
        }
        return redirect(getClass());
    }

    /**
     * Handles password change for the current user.
     *

                }, validationErrorLambda);
                return null;
            });
        }).orElse(() -> {
            throwValidationError(messages -> {
                messages.addErrorsLoginError(GLOBAL);
            }, validationErrorLambda);
        });
    }

    /**
     * Adds a password validation error message to the messages object based on the error key.
     *

     * <pre>
     * message: Invalid username or password.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsLoginError(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_login_error));
        return this;
    }

    /**