OneToMany relationship is not working

Question

My Tables:

Product: id, name

Offer: id, value, product_id

Entities:

@Entity
@Table(name=\"product\"         


        

Answer 1

I am using Eclipselink 2.5.2 version as my ORM vendor and I have faced this issue in one-to-many JPA mapping while lazy loading the containing entities. The workaround that is working for me is:-

final List list = Collections.unmodifiableList(new ArrayList<> 
                                    (containerEntity.getContainingEntityList());

The Mapping from Container Entity side is:

@OneToMany(mappedBy = containerEntity, cascade = CascadeType.ALL, fetchType = FetchType.LAZY)
private List containingEntityList;

Mapping from Containing Entity side is:

@ManyToOne
@JoinColumn(name = "container_entity_id")
private ContainerEntity containerEntity;