I have produced a DTO object from 2 microservices. Profile and ProfileCredit. I am able to successfully retrieve a populated DTO object with relevant data. However I am further curious is it possible to query or do conditional filter on the generated DTO object? and if so what is the approach to achieve just that?
For example using 'swagger' this is what gets returned
Is it possible to filter by profileCredit field which is present in the dto but the data is retrieved within separate microservice?
Any help, suggestions or references to any other posts or pages would be truly helpful.
Controller
#GetMapping(path="/profile/search/username/{username}", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResponseEntity<Page<ProfileCreditDTO>> findProfileByUsername(#PathVariable String username, Pageable pageable) {
Page<ProfileCreditDTO> results= profileCreditService.findProfileBySelectedParameters(username,pageable);
if(results== null){
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
} else
return new ResponseEntity<>(results,HttpStatus.OK);
}
Query within profileCreditService
#Query("SELECT p from PROFILES p where lower(p.username) LIKE :username%")
Page<ProfileCreditDTO> findProfileBySelectedParameters(String username, Pageable pageable);
ProfileCreditServiceImpl
public ProfileCreditDTO findProfileCreditByProfileId(final Long profileId){
log.info("Start of findProfileCreditByProfileId method {}",profileId);
ProfileCreditDTO rc= new ProfileCreditDTO();
Profile profile=profileRepository.findOne(profileId);
if(profile == null){
return null; }
CreditDTO creditDto= profileCreditClient.findClientByProfileId(profile.getId());
if(creditDto == null){
return null; }
rc.setProfile(profile);
rc.setCredit(creditDto);
return rc;
}
private ProfileCreditDTO convertProfileToProfileCreditDTO(final Profile theProfile){
if(theProfile == null)
return null;
ProfileCreditDTO theDTO= new ProfileCreditDTO();
theDTO.setProfile(theProfile);
CreditDTO theCreditDto= profileCreditClient.findClientByProfileId(theProfile.getId());
if(theCreditDto != null )
theDTO.setCredit(theCreditDto);
return theDTO;
}
Profile Domain
#Entity(name = "PROFILES")
#Data #NoArgsConstructor #AllArgsConstructor
#ToString
public class Profile implements Serializable {
#Id
#GeneratedValue(strategy= GenerationType.AUTO)
private Long id;
#Size(min = 2, max = 20)
private String username;
private Integer profileType;
private Integer gender;
private Integer orientation;
private boolean online;
#JsonFormat(pattern="uuuu-MM-dd'T'HH:mm:ss.SSS")
private LocalDateTime created;
#JsonFormat(pattern="uuuu-MM-dd'T'HH:mm:ss.SSS")
private LocalDateTime lastEdited;
Profile Credit DTO
#Data
#AllArgsConstructor
#NoArgsConstructor
#ToString
public class ProfileCreditDTO {
//profile fields
private Long profileId;
#Size(min = 2, max = 50)
private String username;
private Integer gender;
private Integer profileType;
private Integer orientation;
private boolean online;
// Credit fields
private Long creditId;
#Column(unique = true)
private double profileCredit;
public void setProfile(final Profile profile) {
this.setProfileId(profile.getId());
this.setUsername(profile.getUsername());
this.setGender(profile.getGender());
this.setProfileType(profile.getProfileType());
this.setOrientation(profile.getOrientation());
this.setOnline(profile.isOnline());
}
public void setCredit(final CreditDTO credit){
this.setCreditId(credit.getId());
this.setProfileCredit(credit.getProfileCredit());
}
ProfileCreditClient (feign)
#Component
#FeignClient(name = "profileCreditService")
public interface ProfileCreditClient {
#GetMapping("/api/credit/profile/{profileId}")
CreditDTO findClientByProfileId(#PathVariable("profileId") Long clientId);
}
Profile Repository Query
#Query("SELECT p from PROFILES p where lower(p.username) LIKE :username%")
Page<Profile> findByAllParameters(#Param("username") String username, Pageable pageable);
Related
I need that every time I list a portfolio it returns all the images that exist in that specific portfolio
I can list 1 by 1 via ID but when I send my endpoint to list all photos belonging to the ID of a specific portfolio it only returns me null
Photo Class
#Entity
public class Foto {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String nomeArquivo;
#ManyToOne(cascade = CascadeType.MERGE)
private Perfil autonomo;
#Column(length = 5_000_000)
private byte[] fotoByte;
private String tipoArquivo;
}//Getters and Setters
AutonomoService
#Autowired
FotosRepository fotosRepository;
#Autowired
PerfisRepository perfisRepository;
public List<byte[]> portfolio(int id){
if (perfisRepository.existsById(id)) {
return fotosRepository.findAllByAutonomoId(id).stream().map(f-> f.getFotoByte()).collect(Collectors.toList());
}
else {
return null;
}
} //Getters and Setters
Controller
#GetMapping("/portfolio/fotos/{id}")
public ResponseEntity<List<byte[]>> getPortfolioAutonomo(#PathVariable int id) throws IOException {
List<byte[]> result = autonomoService.portfolio(id);
return ResponseEntity.status(200).body(result);
}
And this is the way I can get 1 photo by its id
#GetMapping("/portfolio/{id}")
public ResponseEntity getPortfolio(#PathVariable int id){
Optional<Foto> anexoOptional = fotosRepository.findById(id);
if (anexoOptional.isPresent()) {
Foto anexo = anexoOptional.get();
return ResponseEntity.status(200)
.header("content-type", anexo.getTipoArquivo())
.header("content-disposition", "filename=" + anexo.getNomeArquivo())
.body(anexo.getFotoByte());
} else {
return ResponseEntity.status(404).build();
}
}
Instead of
return fotosRepository.findAllByAutonomoId(id).stream().map(f-> f.getFotoByte()).collect(Collectors.toList());
Can you try with
return fotosRepository.findAllById(id).stream().map(f-> f.getFotoByte()).collect(Collectors.toList());
If still this is not working, better to go with #Query implemention.
Have the same DTO object for POST and PUT methods:
class AcmeRequest {
private String id;
#NotEmpty
private String productCode;
private String description;
}
For POST request I always expect to see productCode field, that's why I specified #NotEmpty annotation but when PUT request received productCode should be optional.
Is it possible some how just to skip #NotEmpty when request is PUT?
Every Hibernate Validator annotation has a groups parameter. Through interfaces, you can control which validations are activated. See more at docs.
In controller level, specify which groups must be activated with the #Validated annotation.
Below, there is a small example from one of my demo projects. I once had the same question as you.
Entity:
#Entity
#Table(name = "tasks")
#Getter #Setter
public class Task
{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Null(message = "You can't provide a task ID manually. ID's are automatically assigned by our internal systems.", groups = {TaskInsertValidatorGroup.class})
#NotNull(message = "You must provide an id" , groups = TaskUpdateValidatorGroup.class)
private Integer id;
#NotBlank(message = "Task description cannot be empty")
#Length(max = 255 , message = "Task description length must not exceed 255 characters")
private String description;
#JsonProperty("is_completed")
#Column(name = "is_completed")
private Boolean isCompleted = false;
#CreationTimestamp
#JsonProperty("created_on")
#JsonFormat(pattern="dd-MM-yyyy HH:mm:ss")
#Column(name = "created_on", updatable = false)
private Timestamp creationDate;
#UpdateTimestamp
#JsonProperty("last_modified")
#JsonFormat(pattern="dd-MM-yyyy HH:mm:ss")
#Column(name = "last_modidied")
private Timestamp lastModificationDate;
#Override
public boolean equals(Object o)
{
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Task task = (Task) o;
return id.equals(task.id);
}
#Override
public int hashCode()
{
return Objects.hash(id);
}
}
Interfaces:
public interface TaskInsertValidatorGroup {}
public interface TaskUpdateValidatorGroup{}
Controller:
RestController
#RequestMapping("/api")
public class TaskRestController
{
#Autowired
private TaskService taskService;
#GetMapping("/tasks/{id}")
public ResponseEntity<?> getTask(#PathVariable Integer id)
{
return new ResponseEntity<>(taskService.findTask(id),HttpStatus.OK);
}
#GetMapping("/tasks")
public ResponseEntity<?> getTasks()
{
return new ResponseEntity<>(taskService.findAllTasks(),HttpStatus.OK);
}
#PostMapping("/tasks")
public ResponseEntity<?> addTask(#Validated(TaskInsertValidatorGroup.class) #RequestBody Task task)
{
taskService.saveTask(task);
APISuccessResponse response = APISuccessResponse.builder()
.info("Task added")
.build();
return new ResponseEntity<>(response,HttpStatus.OK);
}
#RequestMapping(value = "/tasks" , method = RequestMethod.PATCH)
public ResponseEntity<?> updateTask(#Validated(TaskUpdateValidatorGroup.class) #RequestBody Task task)
{
taskService.updateTask(task);
APISuccessResponse response = APISuccessResponse.builder()
.info("Task Updated")
.build();
return new ResponseEntity<>(response,HttpStatus.OK);
}
#RequestMapping(value = "/tasks/{id}", method = RequestMethod.DELETE)
public ResponseEntity<?> removeTask(#PathVariable Integer id)
{
taskService.removeTask(id);
APISuccessResponse response = APISuccessResponse.builder()
.info("Task Deleted")
.build();
return new ResponseEntity<>(response,HttpStatus.OK);
}
}
I wish to have subquery, which provides me filtering actors by name.
I have a rest controller's method, which returns list of actors as JSON from movie base on movieId. I try to add filters as specification, but I have no idea how to write proper query. Base on "Spring Data JPA Specification for a ManyToMany Unidirectional Relationship" I found solution for subquery, which returns me all actors to proper movie base on movieId. Now I try to write this query.
Actor entity
#Data
#NoArgsConstructor
#Entity
#Table(name = "actors")
public class Actor implements Serializable {
private static final long serialVersionUID = 6460140826650392604L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "actor_id")
private Long actorId;
#Column(name = "first_name")
private String firstName;
#ManyToMany(mappedBy = "actors")
#ToString.Exclude
private List<Movie> movie = new ArrayList<>();
#JsonIgnore
public List<Movie> getMovie() {
return this.movie;
}
}
Movie entity
#Data
#Entity
#NoArgsConstructor
#Table(name = "movies")
public class Movie implements Serializable {
private static final long serialVersionUID = 3683778473783051508L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "movie_id")
private Long movieId;
private String title;
#ManyToMany(cascade = { CascadeType.ALL })
#JoinTable(name = "movies_actors"
, joinColumns = { #JoinColumn(name = "movie_id") }
, inverseJoinColumns = { #JoinColumn(name = "actor_id") })
private List<Actor> actors = new ArrayList<>();
#JsonIgnore
public List<Actor> getActors() {
return this.actors;
}
}
//Rest Controller
#CrossOrigin(origins = "http://localhost:3000")
#RestController
#RequestScope
#RequestMapping("/rest")
public class ActorRestController {
private ActorService actorService;
private MovieService movieService;
#Autowired
public ActorRestController(ActorService actorService, MovieService movieService) {
this.actorService = actorService;
this.movieService = movieService;
}
.
.
.
#GetMapping("movies/{movieId}/actors")
public ResponseEntity<Page<Actor>> getAllActorsFromMovieByIdMovie(#PathVariable(name = "movieId") Long movieId, Pageable pageable) {
Optional<Movie> movieFromDataBase = movieService.findMovieById(movieId);
if (movieFromDataBase.isPresent()) {
return new ResponseEntity<>(actorService.findAllActors(ActorSpec.query(movieId), pageable), HttpStatus.OK);
} else {
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
}
.
.
}
// Specification for actor
#NoArgsConstructor(access = AccessLevel.PRIVATE)
public class ActorSpec {
public static Specification<Actor> query(final Long movieId) {
return (root, query, cb) -> {
query.distinct(true);
Subquery<Movie> movieSubQuery = query.subquery(Movie.class);
Root<Movie> movie = movieSubQuery.from(Movie.class);
Expression<List<Actor>> actors = movie.get("actors");
movieSubQuery.select(movie);
movieSubQuery.where(cb.equal(movie.get("movieId"), movieId), cb.isMember(root, actors));
return cb.exists(movieSubQuery);
};
}
}
I would like, my code will return filtered actors by name ex.:
http://localhost:8080/rest/movies/48/actors?name=Collin
will return me
{ "actorId": 159,
"firstName": "Collin",
"lastName": "Konopelski",
"age": 21
},
but in case I do not sent any request param (http://localhost:8080/rest/movies/48/actors), let program return me all actors. I don't want to create new endpoint only for #Requestparam cause, this one is used by UI created in React.
Thanks!
Ok I found,
My solution:
RestController
#GetMapping("movies/{movieId}/actors")
public ResponseEntity<Page<Actor>> getAllActorsFromMovieByIdMovie(#PathVariable(name = "movieId") Long movieId,
#RequestParam(name = "name", required = false) String name,
Pageable pageable) {
Optional<Movie> movieFromDataBase = movieService.findMovieById(movieId);
if (movieFromDataBase.isPresent()) {
return new ResponseEntity<>(actorService.findAllActors(ActorSpec.query(movieId ,name), pageable), HttpStatus.OK);
} else {
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
}
Specification
#NoArgsConstructor(access = AccessLevel.PRIVATE)
public class ActorSpec {
public static Specification<Actor> query(final Long movieId, String name) {
return (root, query, cb) -> {
Predicate predicateMovieID = getPredicateByMovieId(movieId, root, query, cb);
if (Strings.isNotBlank(name)) {
Predicate a = cb.and(predicateMovieID, cb.equal(root.get("firstName"), name));
Predicate b = cb.and(predicateMovieID, cb.equal(root.get("lastName"), name));
return cb.or(a,b);
}
return cb.and(predicateMovieID);
};
}
private static Predicate getPredicateByMovieId(Long movieId, Root<Actor> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
query.distinct(true);
Subquery<Movie> movieSubQuery = query.subquery(Movie.class);
Root<Movie> movie = movieSubQuery.from(Movie.class);
Expression<List<Actor>> actors = movie.get("actors");
movieSubQuery.select(movie);
movieSubQuery.where(cb.equal(movie.get("movieId"), movieId), cb.isMember(root, actors));
return cb.exists(movieSubQuery);
}
}
I try select data from the table by a filter with Spring Data JPA Specification I think what my implementation is correct, But it doesn't work. Help me please understand my mistake and fix my example.
I have very strange SQL query in log :
select phone0_.id as id1_0_, phone0_.note as note2_0_, phone0_.number as number3_0_, phone0_.operator_login as operator4_0_, phone0_.operator_pass as operator5_0_, phone0_.operator_name as operator6_0_, phone0_.operator_url as operator7_0_, phone0_.reg_date as reg_date8_0_, phone0_.status as status9_0_ from phone phone0_ where 0=1 limit ?
In the end: where 0=1 it's crash my mind. Where did that come from?
Here I fill CriteriaBuilder if filter field not null. I expect to get correctly built Specification object and send it to findAll(Specifications.where(specification), Pageable p) method. But something incorrect.
My repo and specification impl:
public interface PhoneRepository extends CrudRepository<Phone, Integer>, JpaRepository<Phone, Integer>, JpaSpecificationExecutor<Phone> {
class PhoneSpecification implements Specification<Phone> {
private final #NonNull PhoneService.PhoneFilter filter;
public PhoneSpecification(#NonNull PhoneService.PhoneFilter filter) {
this.filter = filter;
}
#Override
public Predicate toPredicate(Root<Phone> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
Predicate predicate = cb.disjunction();
if (nonNull(filter.getId())) {
cb.disjunction().getExpressions().add(cb.equal(root.get("id"), filter.getId()));
}
if (nonNull(filter.getNote())) {
cb.disjunction().getExpressions().add(cb.like(root.get("note"), filter.getNote()));
}
if (nonNull(filter.getNumber())) {
cb.disjunction().getExpressions().add(cb.like(root.get("number"), filter.getNumber()));
}
if (nonNull(filter.getStatus())) {
cb.disjunction().getExpressions().add(cb.like(root.get("status"), filter.getStatus()));
}
if (nonNull(filter.getOpName())) {
cb.disjunction().getExpressions().add(cb.like(root.get("operatorName"), filter.getOpName()));
}
if (nonNull(filter.getOpLogin())) {
cb.disjunction().getExpressions().add(cb.like(root.get("operatorAccLogin"), filter.getOpLogin()));
}
if (nonNull(filter.getOpPassword())) {
cb.disjunction().getExpressions().add(cb.like(root.get("operatorAccPassword"), filter.getOpPassword()));
}
if (nonNull(filter.getRegFrom()) && nonNull(filter.getRegTo())) {
cb.disjunction().getExpressions().add(cb.between(root.get("regDate"), filter.getRegFrom(), filter.getRegTo()));
}
return predicate;
}
}
}
This is service level:
#Service
public class PhoneService {
#Autowired
private PhoneRepository phoneRepository;
public Phone get(int id) {
Phone phone = phoneRepository.findOne(id);
return nonNull(phone) ? phone : new Phone();
}
public Page<Phone> list(#NonNull PhoneFilter filter) {
PhoneSpecification specification = new PhoneSpecification(filter);
return phoneRepository.findAll(Specifications.where(specification), filter.getPageable());
}
#Data
public static class PhoneFilter {
private Pageable pageable;
private Integer id;
private Timestamp regFrom;
private Timestamp regTo;
private String number;
private String opLogin;
private String opPassword;
private String opName;
private String status;
private String note;
}
}
And entity
#Entity
#Data
#NoArgsConstructor
#AllArgsConstructor
#Table(name = "phone")
#ToString(exclude = {"accounts"})
#EqualsAndHashCode(exclude = {"accounts"})
public class Phone {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
#OneToMany(mappedBy = "phone", cascade = CascadeType.DETACH)
private Collection<SocialAccount> accounts;
#Column(name = "reg_date")
private Timestamp regDate;
#Column(name = "number")
private String number;
#Column(name = "operator_url")
private String operatorUrl;
#Column(name = "operator_login")
private String operatorAccLogin;
#Column(name = "operator_pass")
private String operatorAccPassword;
#Column(name = "operator_name")
private String operatorName;
#Column(name = "status")
private String status;
#Column(name = "note")
private String note;
}
I find the mistake.
Method CriteriaBuilder.disjunction() this is factory and each time when I call him I got new Predicate object.
This implementation CriteriaBuilderImpl:
public Predicate disjunction() {
return new CompoundPredicate(this, BooleanOperator.OR);
}
Be careful with it.
I'm working with Spring, hibernate and MySql but I have some problem with seralization of query result.
First in my entity I added #JsonManagedReference on Set structure (#OneToMany side) and #JsonBackReference on single object reference (#ManyToOne side) and it works but I wasn't be able to retrieve all needed information (for example #ManyToOne reference).
So i swapping #JsonBackReference on set structure and #JsonManagedReference on single object but I retrieve
No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: com.model.tablesField.TableUI["data"]->java.util.ArrayList[0]->com.domain.Car["carType"]->com.domain.CarType_$$_jvst744_f["handler"])
I tried also with #JsonIgnore on Set structure but it doesn't work for the same issues.
This is my spring configuration
private Properties getHibernateProperties() {
Properties properties = new Properties();
properties.put(PROPERTY_NAME_HIBERNATE_DIALECT, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
// properties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));
properties.put(PROPERTY_NAME_HIBERNATE_FORMAT_SQL, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_FORMAT_SQL));
properties.put("hibernate.enable_lazy_load_no_trans",true);
return properties;
and this is part of one of my several entities:
/**
* Car generated by hbm2java
*/
#Entity
#Table(name = "car", catalog = "ATS")
public class Car implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer idCar;
#JsonManagedReference
private CarType carType;
#JsonManagedReference
private Fleet fleet;
private String id;
private int initialKm;
private String carChassis;
private String note;
#JsonBackReference
private Set<Acquisition> acquisitions = new HashSet<Acquisition>(0);
public Car() {
}
public Car(CarType carType, Fleet fleet, int initialKm, String carChassis) {
this.carType = carType;
this.fleet = fleet;
this.initialKm = initialKm;
this.carChassis = carChassis;
}
public Car(CarType carType, Fleet fleet, String id, int initialKm, String carChassis, String note,
Set<Acquisition> acquisitions) {
this.carType = carType;
this.fleet = fleet;
this.id = id;
this.initialKm = initialKm;
this.carChassis = carChassis;
this.note = note;
this.acquisitions = acquisitions;
}
#Id
#GeneratedValue(strategy = IDENTITY)
#Column(name = "id_car", unique = true, nullable = false)
public Integer getIdCar() {
return this.idCar;
}
public void setIdCar(Integer idCar) {
this.idCar = idCar;
}
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "id_carType", nullable = false)
public CarType getCarType() {
return this.carType;
}
public void setCarType(CarType carType) {
this.carType = carType;
}
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "id_fleet", nullable = false)
public Fleet getFleet() {
return this.fleet;
}
public void setFleet(Fleet fleet) {
this.fleet = fleet;
}
#Column(name = "id", length = 5)
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
#Column(name = "initialKm", nullable = false)
public int getInitialKm() {
return this.initialKm;
}
public void setInitialKm(int initialKm) {
this.initialKm = initialKm;
}
#Column(name = "carChassis", nullable = false, length = 20)
public String getCarChassis() {
return this.carChassis;
}
public void setCarChassis(String carChassis) {
this.carChassis = carChassis;
}
#Column(name = "note", length = 100)
public String getNote() {
return this.note;
}
public void setNote(String note) {
this.note = note;
}
#OneToMany(fetch = FetchType.LAZY, mappedBy = "car")
public Set<Acquisition> getAcquisitions() {
return this.acquisitions;
}
public void setAcquisitions(Set<Acquisition> acquisitions) {
this.acquisitions = acquisitions;
}
}
one method that uses the query:
#Override
#RequestMapping(value = { "/cars/{idFleet}"}, method = RequestMethod.GET)
public #ResponseBody TableUI getCars(#PathVariable int idFleet) {
TableUI ajaxCall=new TableUI();
try {
ajaxCall.setData(fleetAndCarService.findCarsByIdFleet(idFleet));
return ajaxCall;
} catch (QueryException e) {
ErrorResponse errorResponse= ErrorResponseBuilder.buildErrorResponse(e);
LOG.error("Threw exception in FleetAndCarControllerImpl::addCar :" + errorResponse.getStacktrace());
return ajaxCall;
}
}
two class for the query:
public interface DefRdiRepository extends JpaRepository<DefRdi, Integer>{
//#Query("SELECT CASE WHEN COUNT(c) > 0 THEN true ELSE false END FROM DefRdi c WHERE c.parName = ?1 AND c.description= ?2")
//Boolean existsByParNameAndDescription(String parName, String description);
//Query method of spring, I put findBy and then the key of research
DefRdi findByParNameAndDescription(String parName, String description);
}
public interface CarRepository extends JpaRepository<Car, Integer>, CarRepositoryCustom {
//Query method of spring, I put findBy and then the key of research
List<Car> findByFleetIdFleet(int idFleet);
}
Where is my error? I don't want Set object but only the single reference. The problem is only when I serialize. Thanks
UPDATE:
I use #JSonIgnore on all set collectionts and Eager instead lazy ad all works fine, but is there a way to retrieve all the information only when I want, for example having two different query?
So it doesn't work
#Override
#Transactional
public List<Car> findByFleetIdFleet(int idFleet) {
List<Car> carList= carRepository.findByFleetIdFleet(idFleet);
for (Car car:carList){
Hibernate.initialize(car.getCarType());
Hibernate.initialize(car.getFleet());
}
return carList;
// return carRepository.findByFleetIdFleet(idFleet);
}
All collections need to be fetched eagerly when loading them from data base, in order to get serialized by Spring. Make sure you fetch them eagerly (e.g. FetchMode.JOIN). You could also swap #JsonManagedReference from wanted fields with #JsonIgnore to black listed fields, Spring automatically serialises every field without annotation.
Update:
Changing the data repository to something like that should work, I am not sure it compiles, but I think you will get the point:
#EntityGraph(value = "some.entity.graph", type = EntityGraph.EntityGraphType.FETCH)
#Query(
value = "SELECT c FROM Car c INNER JOIN FETCH c.acquisitions WHERE c.id = :idFleet"
)
public interface CarRepository extends JpaRepository<Car, Integer>, CarRepositoryCustom {
//Query method of spring, I put findBy and then the key of research
List<Car> findByFleetIdFleet(int idFleet);
}
For more information look at this post and read the official documentation.
Workaround:
There seems to be a workaround, however fetching those collections eager like shown above should have a positive performance impact, since there is no need for loading proxies afterwards. Also no open transactions are needed at controller level.