I have two entity classes: Fund and FundMetadata, FundMetadata mapped to Fun Fund as one-to-one relation with @MapsId. When I try to save Fund with populated FundMetadata (by FundServiceImpl#save method) the next exception appears:
{code}
Caused by: org.hibernate.id.IdentifierGenerationException: null id generated for:class org.gh.db.persistence.metadata.FundMetadata
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:192)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:827)
{code}
{code:java}
@Entity
@Table(name = "Fund_Metadata", schema = "metadata")
class FundMetadata {
private Integer id;
private Fund fund;
private LocalDateTime externalNotesEditDate;
@Id
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@MapsId
@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "fundId", nullable = false, updatable = false)
public Fund getFund() {
return fund;
}
public void setFund(Fund fund) {
this.fund = fund;
}
@Column(name = "externalNotesEditDate", columnDefinition = "datetime", nullable = false)
public LocalDateTime getExternalNotesEditDate() {
return externalNotesEditDate;
}
public void setExternalNotesEditDate(LocalDateTime externalNotesEditDate) {
this.externalNotesEditDate = externalNotesEditDate;
}
}
@Entity
@Table(name = "Fund")
class Fund {
private Integer entityId;
private FundMetadata metadata;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Integer getEntityId() {
return entityId;
}
public void setEntityId(Integer entityId) {
this.entityId = entityId;
}
@PrimaryKeyJoinColumn
@OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
public FundMetadata getMetadata() {
return metadata;
}
public void setMetadata(FundMetadata metadata) {
this.metadata = metadata;
}
}
@Service
class FundServiceImpl implements FundService {
private final FundRepository fundRepository;
public FundServiceImpl(FundRepository fundRepository) {
this.fundRepository = fundRepository;
}
public Fund save(Fund entity) {
final FundMetadata metadata = new FundMetadata();
metadata.setFund(entity);
metadata.setExternalNotesEditDate(LocalDateTime.now());
entity.setMetadata(metadata);
return fundRepository.save(entity);
}
}
{code} |
|
