I am using Spring Boot REST Web Services and Angular 5 as a frontend, well I have a model class for hibernating like this :
#Entity
public class Title {
private Integer id;
private String name;
private Date releaseDate;
private Time runtime;
private String storyline;
private String picture;
private String rated;
private String type;
private Double rating;
private Integer numberOfVotes;
private Timestamp inserted;
private Set<Genre> genres = new HashSet<>();
private List<TitleCelebrity> titleCelebrities;
private List<TitleMedia> titleMedia;
// Basic getters and setter
#ManyToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE })
#JoinTable(name = "title_genre", joinColumns = { #JoinColumn(name = "title_id") }, inverseJoinColumns = { #JoinColumn(name = "genre_id") })
public Set<Genre> getGenres() {
return genres;
}
public void setGenres(Set<Genre> genres) {
this.genres = genres;
}
#OneToMany(mappedBy = "title", cascade = CascadeType.ALL)
public List<TitleCelebrity> getTitleCelebrities() {
return titleCelebrities;
}
public void setTitleCelebrities(List<TitleCelebrity> titleCelebrities) {
this.titleCelebrities = titleCelebrities;
}
#OneToMany(mappedBy = "title", cascade = CascadeType.ALL)
public List<TitleMedia> getTitleMedia() {
return titleMedia;
}
public void setTitleMedia(List<TitleMedia> titleMedia) {
this.titleMedia = titleMedia;
}
}
And here's my REST controller
#RestController
#RequestMapping("titles")
#CrossOrigin(origins = {"http://localhost:4200"})
public class TitleController {
private TitleService titleService;
#Autowired
public void setTitleService(TitleService titleService) {
this.titleService = titleService;
}
// Api to get all the movies ordered by release date
#GetMapping("movies")
public List<Title> getAllMoviesOrderByReleaseDateDesc() {
return this.titleService.findByTypeOrderByReleaseDateDesc("movie");
}
#GetMapping("movies/{id}")
public Title findById(#PathVariable Integer id) {
return this.titleService.findById(id);
}
}
What I want is when I make a request to the first method '/movies' i don't want the collection of Telemedia, but if I make a request to the second method '/movies/id' i want the collection of Telemedia.
of course, the annotation #JsonIgnore will ignore the collection whatever the request is.
It may be better to create two models in this case; one to represent the first response and another to represent the second response.
You could also set the collection to null in your second request before sending it back.
You cannot accomplish this with #JsonIgnore alone as you cannot perform conditional logic in annotations.
Related
So i have two classes,
class User:
#Data
#NoArgsConstructor
#Entity
public class User {
#Id
#GeneratedValue
private int id;
private String displayName;
private String email;
private String gender;
private String Nationality;
private int age;
#OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private List<Event> createdEvents;
#OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private List<Reservation> clientReservations;
}
and class Event:
#Data
#Entity
public class Event {
#Id
#GeneratedValue
private int id;
private String eventName;
private Date eventDate;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created_at", nullable = false, updatable = false)
#CreatedDate
private Date createdAt;
#ManyToOne
#JoinColumn(name="user_id")
private User user;
}
Contoller class:
#RestController
#RequestMapping("/event")
public class EventController {
#Autowired
private EventRepository eventRepository;
#PostMapping("/create")
public Event addEvent(#RequestBody Event event) {
return eventRepository.save(event);
}
}
Json:
"eventName": "theatre",
"eventDate": "2020-04-22",
"user": 3
im new to spring boot and what I've tried doesn't work.
now i want to add a single Event, and i need to pass a user id to reference the user who created the event, How can i do it ?
1.
In your Event class, add a constructor like this:
public Event(String eventName, Date eventDate, User user) {
this.createdAt = new DateTime();
this.eventName = eventName;
this.eventDate = eventDate;
this.user = user;
}
2.
Instead of passing Event as #RequestBody, consider creating a dto that handles submitted data on Post requests
public class EventDto {
private String eventName;
private String eventDateString;
private Long userId;
public String getEventName() {
return eventName;
}
public void setEventName(String eventName) {
this.eventName = eventName;
}
public String getEventDateString() {
return eventDateString;
}
public void setEventDateString(String eventDateString) {
this.eventDateString = eventDateString;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
}
Then you must replace #RequestBody Event event with #RequestBody EventDto eventDto
3.
Inject UserRepository, handle data, check that submitted user id exists and save your Event
#PostMapping("/create")
public Event addEvent(#RequestBody EventDto eventDto) throws ParseException {
var user = userRepository.findById(eventDto.getUserId());
if (user.isPresent()) {
Event event = new Event(eventDto.eventName.trim(), new SimpleDateFormat("yyyy-MM-dd").parse(eventDto.eventDateString), user.get());
eventRepository.save(event);
}
}
I have a spring rest api application that is using HATEOAS/PagingAndSortingRepository to do most of the heavy lifting.
I have implemented caching using guava but I am having issues where when the user cancels the request midway through an api call, it caches the incomplete json and re-serves it for 60 seconds.
I am trying to use the unless="" parameter of the #Cacheable annotation. Previously, I just used unless="#result == null" but that does not handle incomplete or invalid json.
This does not seem to work either. So now I am trying to use com.google.gson.JsonParser to parse the result and invalidate if applicable.
Repository
#RepositoryRestResource(path = "products", collectionResourceRel = "products")
public interface ProductEntityRepository extends PagingAndSortingRepository<ProductEntity, String> {
JsonParser parser = new JsonParser();
#Cacheable(value = CacheConfig.STORE_CACHE)
ProductEntity findByName(String name);
}
Cache Config
public final static String PRODUCTS_CACHE = "products";
#Bean
public Cache productsCache() {
return new GuavaCache(PRODUCTS_CACHE, CacheBuilder.newBuilder()
.expireAfterWrite(60, TimeUnit.SECONDS)
.build());
}
How do I detect invalid json in the unless="" parameter?
I figured out my own issue!
When I interrupted the api request to localhost/products and re-requested, I finally saw an error about not being able to fetch a onetomany mapping. I believe the error was lazy initialization error for a collection.
I solved this issue by adding #LazyCollection(LazyCollectionOption.FALSE) to my models where the #OneToMany and #ManyToOne mappings were decalared.
For example:
#Entity(name = "product")
#Table(name = "products", schema = "${DB_NAME}", catalog = "")
public class ProductEntity {
private Integer id;
private String name;
private List shipments = new ArrayList<>();
#Id
#Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
#Basic
#Column(name = "name", nullable = false, length = 10)
public String getName() { return name; }
public void setName(String name) {
this.name = name;
}
#OneToMany(mappedBy = "shipmentID", targetEntity=ShipmentEntity.class)
#LazyCollection(LazyCollectionOption.FALSE)
public Collection<ShipmentEntity> getShipments() { return shipments; }
public void setShipments(Collection<ShipmentEntity> shipments) { this.shipments = shipments; }
}
In our spring boot Restful WebService, we have two master tables with many-to-many relationship between them. But in the transaction table, we want one extra field (current_time) as part of the embedded key other than the primary keys of the two tables. Now, we’ve created a separate class for defining embedded primary key using #Embeddable. Now, while inserting one transaction row to transaction table using Spring JPA, I am manually setting the primary keys in the corresponding entity and calling the save method on corresponding repository. But It is giving me ConstraintViolationException as the current_time is going with null value even if I have manually set it. Any help would be highly appreciated.
First Entity is as follows :
#Entity
#Table(name = "project")
public class Project {
#Id
#GenericGenerator(name = "projectid", strategy = "com.sample.upload.entity.ProjectIDGenerator")
#GeneratedValue(generator = "projectid")
#Column(name = "projectid")
private String projectID;
#Column(name = "project_name")
private String projectName;
#Column(name = "project_descr")
private String projectDesc;
#Column(name = "project_input_path")
private String projectPath;
#Column(name = "project_creation_time")
private Calendar projectCreationTime;
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(name = "project_migration", joinColumns = #JoinColumn(name = "projectid", referencedColumnName = "projectid"), inverseJoinColumns = #JoinColumn(name = "migratorid", referencedColumnName = "migratorid"))
private List<Migrator> migrators;
#Column(name = "account_name")
private String accountName;
#Column(name = "account_group")
private String accountGroup;
public String getProjectID() {
return projectID;
}
public void setProjectID(String projectID) {
this.projectID = projectID;
}
public String getAccountName() {
return accountName;
}
public void setAccountName(String accountName) {
this.accountName = accountName;
}
public String getAccountGroup() {
return accountGroup;
}
public void setAccountGroup(String accountGroup) {
this.accountGroup = accountGroup;
}
public String getProjectName() {
return projectName;
}
public void setProjectName(String projectName) {
this.projectName = projectName;
}
public String getProjectDesc() {
return projectDesc;
}
public void setProjectDesc(String projectDesc) {
this.projectDesc = projectDesc;
}
public String getProjectPath() {
return projectPath;
}
public void setProjectPath(String projectPath) {
this.projectPath = projectPath;
}
public Calendar getProjectCreationTime() {
return projectCreationTime;
}
public void setProjectCreationTime(Calendar projectCreationTime) {
this.projectCreationTime = projectCreationTime;
}
public List<Migrator> getMigrators() {
return migrators;
}
public void setMigrators(List<Migrator> migrators) {
this.migrators = migrators;
}
}
Second Entity :
#Entity
#GenericGenerator(name = "generatorName", strategy = "increment")
#Table(name = "migrator")
public class Migrator {
#Id
#GeneratedValue(generator = "generatorName")
#Column(name = "migratorid")
private String migratorId;
#Column(name = "src_tech_name")
private String srcTechName;
#Column(name = "dest_tech_name")
private String destTechName;
#Column(name = "migrator_name")
private String migratorName;
#Column(name = "migrator_type")
private String migratorType;
public String getMigratorId() {
return migratorId;
}
public void setMigratorId(String migratorId) {
this.migratorId = migratorId;
}
public String getSrcTechName() {
return srcTechName;
}
public void setSrcTechName(String srcTechName) {
this.srcTechName = srcTechName;
}
public String getDestTechName() {
return destTechName;
}
public void setDestTechName(String destTechName) {
this.destTechName = destTechName;
}
public String getMigratorName() {
return migratorName;
}
public void setMigratorName(String migratorName) {
this.migratorName = migratorName;
}
public String getMigratorType() {
return migratorType;
}
public void setMigratorType(String migratorType) {
this.migratorType = migratorType;
}
#Override
public String toString() {
return "Technology [migratorId=" + migratorId + ", srcTechName=" + srcTechName + ", destTechName="
+ destTechName + ", migratorName=" + migratorName + ", migratorType=" + migratorType + "]";
}
}
The join (transaction) table's entity :
#Entity
#Table(name = "project_migration")
public class ProjectMigration {
#EmbeddedId
private ProjectMigrationID migrationId;
#Column(name ="migration_finish_time")
private Calendar migrationFinishTime;
#Column(name ="time_in_millis_for_migration")
private long timeInMillisForMigration;
#Column(name ="migration_status")
private String migrationStatus;
#Column(name ="migrated_codebase_path")
private String migratedCodeBasePath;
The embedded Primary Key class is as follows:
#Embeddable
public class ProjectMigrationID implements Serializable {
private static final long serialVersionUID = -3623993529011381924L;
#Column(name = "projectid")
private String projectId;
#Column(name = "migratorid")
private String migratorId;
#Column(name = "migration_start_time")
private Calendar migrationStartTime;
public ProjectMigrationID() {
}
public ProjectMigrationID(String projectId, String migratorId, Calendar migrationStartTime) {
this.projectId = projectId;
this.migratorId = migratorId;
this.migrationStartTime = migrationStartTime;
}
The snippet from service Class :
for (String migratorId : data.getMigratorIds()) {
Migrator migrator = migratorRepository.findByMigratorId(migratorId);
migrators.add(migrator);
}
if (projectId != null) {
project = projectRepository.findByProjectID(projectId);
System.out.println(project==null);
project.setMigrators(migrators);
System.out.println("I am here");
if (project != null) {
//project.setMigrationStatus("In Progress");
ProjectMigrationID pmId = new ProjectMigrationID();
pmId.setProjectId(project.getProjectID());
pmId.setMigratorId(project.getMigrators().get(0).getMigratorId());
pmId.setMigrationStartTime(new GregorianCalendar());
ProjectMigration pm = new ProjectMigration();
pm.setMigrationId(pmId);
pm.setMigrationStatus("Pending");
projectMigrationRepository.save(pm);
That's because of the #JoinTable where the date is not included and it skips the insertion. If you include a column with all the primary keys needed, it will work as expected.
Only the columns mapped via #JoinTable will be included during insertion or update (defaults to true when mapped)
Either include the date time column in the Project class or use association without #JoinTable.
I'm editing via mobile. So please ignore typos if any.
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?
Specifying lazy loading is only a hint for the JPA provider. Depending on the provider you use (Hibernate, EclipseLink etc.) it may be completely ignored and the dependencies may be eagerly fetched.
What you need to do is configure how your classes are mapped to json. Assuming you are using Jackson you may need to use annotations like #JsonIgnore or #JsonView. You may also map your class that only has the fields you need.
You can use Jackson annotations #JsonBackReference/#JsonManagedReference. They address problem of infinite recursion with bidirectional links in object model. As far as I understand it is your case.
See http://www.baeldung.com/jackson-bidirectional-relationships-and-infinite-recursion for more information.
One thing to point is that debugging while the transaction is open (touching the collection) will cause it to be loaded even if at real time it doesn't .. the other thing is that as #Apokralipsa mentioned , LAZY loading is just a hint that can be totally ignored and should never be relied upon whatever technique you are using
Im trying to make a basic create operation with hibernate and spring, but i keep getting the message that a id is empty when it is not.So im thinking that it might be because, the entity uses a composite id, fun fact at least for me is that i don't have any problem deleting the entities.
The method im using
#RequestMapping(value="addPatientFamilyRelative",method = RequestMethod.POST)
public #ResponseBody String addPatientFamilyRelative(#RequestParam(value="idPatient")int idPatient,
#RequestParam(value="idRelative")int idRelative,
#RequestParam(value="idRelationship")int idRelationship)
{
Patient_Relative patientRelative = new Patient_Relative();
patientRelative.setIdRelationship(relationshipService.getById(idRelationship));
patientRelative.setPatient(patientService.getById(idPatient));
patientRelative.setRelative(relativeService.getRelative(idRelative));
prService.create(patientRelative);
return "$('#tblPatientFamilyPatientRelatives').ajax.reload();$('#tblPatientRelativesList').ajax.reload()";
}
Patient_Relative class
#Entity
#Table(name="Patient_Relative")
public class Patient_Relative implements Serializable{
/**
*
*/
private static final long serialVersionUID = -2670460334767266076L;
#EmbeddedId
#JoinColumn(name = "idRelative", referencedColumnName = "idRelative", insertable = false, updatable = false)
#ManyToOne(optional = false)
#JsonIgnore
private Relative relative;
#JoinColumn(name = "idRelationship", referencedColumnName = "idRelationship")
#ManyToOne
private Relationship idRelationship;
#JoinColumn(name = "idPatient", referencedColumnName = "idPatient", insertable = false, updatable = false)
#ManyToOne(optional = false)
#JsonIgnore
private Patient patient;
public Relative getRelative() {
return relative;
}
public void setRelative(Relative relative) {
this.relative = relative;
}
public Relationship getIdRelationship() {
return idRelationship;
}
public void setIdRelationship(Relationship idRelationship) {
this.idRelationship = idRelationship;
}
public Patient getPatient() {
return patient;
}
public void setPatient(Patient patient) {
this.patient = patient;
}
}
PatientRelativeId
#Embeddable
public class PatientRelativeId implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 2719758608242901070L;
#Column(name = "idPatient")
private int patientId;
#Column(name = "idRelative")
private int relativeId;
public PatientRelativeId() {
}
public PatientRelativeId(int patientId, int relativeId) {
this.patientId = patientId;
this.relativeId = relativeId;
}
public int getPatientId() {
return patientId;
}
public void setPatientId(int patientId) {
this.patientId = patientId;
}
public int getRelativeId() {
return relativeId;
}
public void setRelativeId(int relativeId) {
this.relativeId = relativeId;
}
}
i hope this is enough to get some ideas, i would have liked to add a column just for the id but i think im not able to do that anymore.
Thanks in advance
I hope this helps someone.
First , my Patient_Relative class was short 1 variable , the one that would store the composite id, so i added the variable PatientRelativeId compositeId.
Second, at the controller method all i had to do was set the values of the composite id , the patient and the relative , and then call the service to create the object.
#RequestMapping(value="addPatientFamilyRelative",method = RequestMethod.POST)
public #ResponseBody String addPatientFamilyRelative(#RequestParam(value="idPatient")int idPatient,
#RequestParam(value="idRelative")int idRelative,
#RequestParam(value="idRelationship")int idRelationship)
{
Patient_Relative patientRelative = new Patient_Relative();
PatientRelativeId id = new PatientRelativeId(idPatient, idRelative);
patientRelative.setPatienRelativeId(id);
patientRelative.setIdRelationship(relationshipService.getById(idRelationship));
patientRelative.setPatient(patientService.getById(idPatient));
patientRelative.setRelative(relativeService.getRelative(idRelative));
prService.create(patientRelative);
return "addRelative";
}