A simple model that maps a collection through a unique column
{code:java}
@Entity
@Table(name = "base_object")
public class BaseObject implements Serializable {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
@Column(name = "name", nullable = false, unique = true)
private String name;
@ManyToMany
@JoinTable(
name = "related_objects",
joinColumns = @JoinColumn(name = "base_name", referencedColumnName = "name"),
inverseJoinColumns = @JoinColumn(name = "related_name", referencedColumnName = "name")
)
private Set<RelatedObject> related = new HashSet<>();
}
@Entity
@Table(name = "related_object")
public class RelatedObject {
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
@Column(name = "name", nullable = false, unique = true)
private String name;
}
{code}
When trying to add a {{RelatedObject}} reference to the collection, the flushing fails with a NULL constraint violation, although the proxy is lazily initialized.
{code:java}
BaseObject b = entityManager.find(BaseObject.class, bId);
RelatedObject r = entityManager.getReference(RelatedObject.class, rId);
b.getRelated().add(r);
entityManager.flush();
{code}
Note that it works when using property mapping instead, so this seems to be related to the proxy not being narrowed before being accessed. |
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