Do I need to set a childs parent? - jpa

Question

I am having an issue where the Domain (child) is not getting the Business (parents) id. I have the business created and the domain but the domain does not have the business_id. Below is what I was doing originally. I then made a test path that I called which gave the same behavior unless I used the setBusiness method of the domain. Is this the expectation? Do I need to loop over the domains that are passed from a client and set the business?
Test
public void test() {
Business b = new Business();
b.setName("Test Test");
Domain d1 = new Domain();
d1.setName("Domain 1");
d1.setBusiness(b);
em.persist(b);
em.flush();
}
Code
#Entity
#Table(name = "Business")
public class Business {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#OneToMany(mappedBy="business", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Domain> domains = new ArrayList<>();
//...getters and setters
}
-
#Entity
#Table(name = "Domain")
public class Domain {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinColumn(name = "business_id", nullable = false)
private Business business;
//...getters and setters
}
I was calling a rest service using the below JSON which then persisted the business.
{
"name": "Business Test ",
"domains": [{"name": "test domain"}]
}
#Path("business")
public class BusinesResouce {
#EJB
BusinessService service;
#Path("create")
#POST
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_JSON)
public void create(Business entity) {
service.persist(entity);
}
//other paths
}
-
#Stateless
public class BusinessService {
private static final String PERSISTENCE_UNIT_NAME = "edc";
#PersistenceContext(unitName = PERSISTENCE_UNIT_NAME)
private EntityManager em;
public void persist(Business entity) {
em.persist(entity);
//Do I really need to loop entity.getDomains and setBusiness?
em.flush();
}
}