spring neo4j optional orElse() error - spring-data-neo4j

Question

I´m using the example from spring-boot-neo4j , the class ProductServiceImpl on line 37, has a orElse() method.
public Product getById(Long id) {
return productRepository.findById(id).orElse(null);
}
In my case I don´t know why it is marked as error saying that "Cannot resolve method orElse(null),
why so? what am I missing?
This is my Product domain
#NodeEntity
public class Product {
#GraphId
private Long id;
private String description;
private BigDecimal price;
private String imageUrl;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
//getters and setters
}
My repository
import guru.springframework.domain.Product;
import org.springframework.data.neo4j.repository.GraphRepository;
import org.springframework.data.neo4j.repository.Neo4jRepository;
public interface ProductRepository extends GraphRepository<Product> {
Product findById(Long id);
Product deleteById(Long id);
}
Service
import guru.springframework.commands.ProductForm;
import guru.springframework.converters.ProductFormToProduct;
import guru.springframework.domain.Product;
import guru.springframework.repositories.ProductRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
#Service
public class ProductServiceImpl implements ProductService {
private ProductRepository productRepository;
private ProductFormToProduct productFormToProduct;
#Autowired
public ProductServiceImpl(ProductRepository productRepository, ProductFormToProduct productFormToProduct) {
this.productRepository = productRepository;
this.productFormToProduct = productFormToProduct;
}
//some methods..
#Override
public Product getById(Long id) {
return productRepository.findById(id).orElse(null);
//return productRepository.findById(id);
}
}
The pom file is the same as pom.xml