I've worked with Spring and Hibernate. Now having a look at Spring Data JPA (2.0.3) with JPA 2.2
AgencyTicketType
@Entity
@Table(name = "agency_ticket_type", catalog = "test")
public class AgencyTicketType implements java.io.Serializable {
private Long id;
private String name;
private Agency agency;
private Set<AgencyTicketCategory> agencyTicketCategories = new HashSet<AgencyTicketCategory>(0);
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id", unique = true, nullable = false)
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name = "name", nullable = false, length = 100)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "agency_id", nullable = false)
public Agency getAgency() {
return this.agency;
}
public void setAgency(Agency agency) {
this.agency = agency;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "agencyTicketType")
public Set<AgencyTicketCategory> getAgencyTicketCategories() {
return this.agencyTicketCategories;
}
public void setAgencyTicketCategories(Set<AgencyTicketCategory> agencyTicketCategories) {
this.agencyTicketCategories = agencyTicketCategories;
}
}
AgencyTicketCategory
@Entity
@Table(name = "agency_ticket_category", catalog = "waytest")
public class AgencyTicketCategory implements java.io.Serializable {
private Long id;
private AgencyTicketType agencyTicketType;
private String name;
private BigDecimal price;
private Set<TripTicket> tripTickets = new HashSet<TripTicket>(0);
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id", unique = true, nullable = false)
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "agency_ticket_type_id", nullable = false)
public AgencyTicketType getAgencyTicketType() {
return this.agencyTicketType;
}
public void setAgencyTicketType(AgencyTicketType agencyTicketType) {
this.agencyTicketType = agencyTicketType;
}
@Column(name = "name", nullable = false, length = 100)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = "price", nullable = false, precision = 8)
public BigDecimal getPrice() {
return this.price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "agencyTicketCategory")
public Set<TripTicket> getTripTickets() {
return this.tripTickets;
}
public void setTripTickets(Set<TripTicket> tripTickets) {
this.tripTickets = tripTickets;
}
}
Repository
public interface TicketTypeRepository extends JpaRepository<AgencyTicketType, Long> {
@EntityGraph(attributePaths={ "agencyTicketCategories" }, type=EntityGraphType.LOAD)
@Query("select type from AgencyTicketType type where type.agency.code=?1")
List<AgencyTicketType> findByAgency(String agencyCode);
}
Service
@Service
public class TicketServiceImpl implements TicketService {
@Autowired private TicketTypeRepository ticketType;
@Transactional(readOnly=true)
@Override
public List<AgencyTicketType> findByName(String code) {
return ticketType.findByAgency(code);
}
}
When debugged on Service, it seems, the query eagerly fetches all the lazy loaded properties - agency, agencyTicketCategories - and all their inner lazy loaded properties, which leads to JSON serilization error.
Need to fetch only these
AgencyTicketTypes [
{
id, name,
agencyTicketCategories [
{id,name,price},....
]
},.....
]
Can I do this with @EntityGraph? What I am missing?
