Jackson

List<Point> points = new ArrayList<Point>();
ObjectMapper objectMapper = new ObjectMapper();
JavaType javaType = objectMapper.getTypeFactory().constructParametrizedType(ArrayList.class, List.class, Point.class);
List<Point> points = null;
String itemsStr = recordT.getItems();

points = objectMapper.readValue(itemsStr, javaType);
record.setItems(points);