Product.java

@AutoValue
public abstract class Product {
  @SerializedName("id")
  public abstract long getId();
  
  @SerializedName("name")
  public abstract String getName();
  
  @SerializedName("price")
  public abstract float getPrice();
  
  public static TypeAdapter<Product> typeAdapter(Gson gson) {
    return new AutoValue_Product.GsonTypeAdapter(gson);  
  }
}