public void setItems(List<Item> items) {
    if (this.items == null) {
      this.items = new ArrayList<>();
    }

    this.items.addAll(items);
  }
The Order class is an abstraction modeling a order.
<p>

@since GemFire 8.0
geode-web-api/src/integrationTest/java/org/apache/geode/rest/internal/web/controllers/Order.java