// Define abstract value type using interface, abstract class or annotation
@Value.Immutable
public interface ValueObject {
  String getName();
  List<Integer> getCounts();
  Optional<String> getDescription();
}
// Use generated immutable implementation and builder
ValueObject valueObject =
    ImmutableValueObject.builder()
        .name("Nameless")
        .description("present")
        .addCounts(1)
        .addCounts(2)
        .build();