Entity X import JSON

EntityX.java

public void importFromJson(JSONObject input) throws Exception{
    for (Field field : this.getClass().getDeclaredFields()) {
        String fieldName = field.getName();
        if (fields.containsKey(fieldName)) {
            field.setAccessible(true);
            EntityMetaData t = fields.get(fieldName);
            if (input.has(t.key)) {
                if (t.isArray) {
                    JSONArray array = null;
                    try {
                        array = input.getJSONArray(t.key);
                    } catch (Exception E) {
                        array = null;
                    }
                    if (array != null) {
                        List list = (List) castList(t.collectionType);
                        if (t.isDerivedFromEntity) {
                            for (int i = 0; i < array.length(); i++) {
                                list.add(castObject(array.getJSONObject(i), t.entityType));
                            }
                        } else {
                            for (int i = 0; i < array.length(); i++) {
                                Object data = array.get(i);
                                list.add(data);
                            }
                        }
                        field.set(this, list);
                    }
                } else {
                    if (t.isDerivedFromEntity) {
                        field.set(this, castObject(input.getJSONObject(t.key), t.entityType));
                    } else {
                        Object data = input.get(t.key);
                        field.set(this, data);
                    }
                }
            }
        }
    }
}

private <T extends EntityX> T castObject(JSONObject obj, Class<T> type) throws Exception {
    if (obj != null) {
        T w = type.newInstance();
        w.importFromJson(obj);
        return w;
    } else {
        return null;
    }
}

private <T> T castList(Class<T> type) throws Exception {
    T w = type.newInstance();
    return w;
}