asDBObject

    public static <T> BasicDBObject asDBObject(T instance) {
        BasicDBObject b = new BasicDBObject();
        Collection<Field> fieldMap = getAnnotationFields(instance.getClass(), DBSync.class);
        for (Field f : fieldMap) {
            try {
                DBSync saveData = f.getAnnotation(DBSync.class);
                if (saveData == null) {
                    continue;
                }
                if (!isSerializeAble(f)) {
                    continue;
                }
                boolean hadAccess = f.isAccessible();
                if (!hadAccess) {
                    f.setAccessible(true);
                }
                String fieldName = f.getName();
                if (!saveData.value().isEmpty()) {
                    fieldName = saveData.value();
                }
                if (f.getType().isArray()) { // array
                    Object[] arrayData = (Object[]) f.get(instance);
                    Class<?> arrayType = getArrayType(f);
                    if (isPrimitive(arrayType)) {
                        b.put(fieldName, f.get(instance));
                        continue;
                    } else {
                        BasicDBList list = new BasicDBList();
                        for (Object arrayObject : arrayData) {
                            list.add(asDBObject(arrayObject));
                        }
                        b.put(fieldName, list);
                        continue;
                    }
                } else if (Collection.class.isAssignableFrom(f.getType())) { // Collection
                    Collection collectionData = (Collection) f.get(instance);
                    Class<?> collectionType = getCollectionType(f);
                    if (isPrimitive(collectionType)) {
                        b.put(fieldName, f.get(instance));
                        continue;
                    } else {
                        BasicDBList list = new BasicDBList();
                        for (Object collectionObject : collectionData) {
                            list.add(asDBObject(collectionObject));
                        }
                        b.put(fieldName, list);
                        continue;
                    }
                }
                Object o = f.get(instance);
                f.setAccessible(hadAccess);
                b.put(fieldName, o);
            } catch (IllegalAccessException | IllegalArgumentException ex) {
                ex.printStackTrace();
            }
        }
        return b;
    }