try {
            Field field = findField(obj.getClass(), fieldName);
            field.setAccessible(true);
            return field.get(obj);
        } catch (Exception e) {
            throw new RuntimeException("Failed to get field " + fieldName, e);
        }
    }

    private Field findField(Class<?> clazz, String fieldName) throws NoSuchFieldException {

        currentFormField.setAccessible(true);
        currentFormField.set(action, form);

        // Set fessConfig via reflection
        final java.lang.reflect.Field fessConfigField = findField(action.getClass(), "fessConfig");
        fessConfigField.setAccessible(true);
        fessConfigField.set(action, ComponentUtil.getFessConfig());

        // Call registerExtraFields via reflection

    // Helper methods
    private void setPrivateField(Object target, String fieldName, Object value) throws Exception {
        Field field = findField(target.getClass(), fieldName);
        field.setAccessible(true);
        field.set(target, value);
    }

    private Field findField(Class<?> clazz, String fieldName) {
        while (clazz != null) {
            try {
                return clazz.getDeclaredField(fieldName);

        try {
            Field f = findField(target.getClass(), name);
            f.setAccessible(true);
            return f.get(target);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    // Helper: find field in class hierarchy
    private static Field findField(Class<?> clazz, String name) throws NoSuchFieldException {