Field field = DBFluteSystem.class.getDeclaredField("finalTimeZoneProvider");
            field.setAccessible(true);
            return (DfFinalTimeZoneProvider) field.get(null);
        } catch (NoSuchFieldException e) {
            // Field might not exist in this version, return null
            return null;
        } catch (IllegalAccessException e) {
            // Cannot access field due to security restrictions

        }
    }

    private Field getFieldIfExists(String fieldName) {
        try {
            return FessHtmlPath.class.getDeclaredField(fieldName);
        } catch (NoSuchFieldException e) {
            return null;
        }
    }

    private java.lang.reflect.Field findField(Class<?> clazz, String fieldName) {
        while (clazz != null) {
            try {
                return clazz.getDeclaredField(fieldName);
            } catch (final NoSuchFieldException e) {
                clazz = clazz.getSuperclass();
            }
        }
        throw new RuntimeException("Field not found: " + fieldName);
    }