}

        @Override
        public String getSimilarDocHash() {
            return null;
        }

        @Override
        public java.util.Locale getLocale() {
            return java.util.Locale.ROOT;
        }
    }

    // Mock classes
    private static class MockFessConfig extends FessConfig.SimpleImpl {

     * @return localized message or default value
     */
    public static String getMessage(final String key, final String defaultValue) {
        final Locale locale = LaRequestUtil.getOptionalRequest().map(HttpServletRequest::getLocale).orElse(Locale.ROOT);
        return ComponentUtil.getMessageManager().findMessage(locale, key).orElse(defaultValue);
    }

    /**

            validationMessagesLambda.message(messages);
            message = ComponentUtil.getMessageManager()
                    .toMessageList(LaRequestUtil.getOptionalRequest().map(HttpServletRequest::getLocale).orElse(Locale.ENGLISH), messages)
                    .stream()
                    .collect(Collectors.joining(" "));
            return this;
        }
    }

    /**

            }
            if (request.getAttribute(LastaWebKey.USER_LOCALE_KEY) instanceof final Locale requestLocale) {
                return requestLocale;
            }
            return request.getLocale();
        }).orElse(Locale.getDefault());
    }

    /**
     * Gets the language instruction based on the user's locale.
     *