i have a table in DB2 with name as policy this table has a composite primary key with columns : policy_id, context_cd.
policy_id is marked as always generated.
i am using spring boot with spring data jpa ,
Dialect i am using is org.hibernate.dialect.DB2Dialect in the properties file.
i have prepared the entity as below for the table policy
#Entity
#Data
#Table(name = "POLICY", schema = "...")
#IdClass(value = IdGenerationIdentity.class)
public class Policy {
// #EmbeddedId
// private IdGenerationIdentity idGenerationIdentity = new IdGenerationIdentity();
#Column(name="POLICY_ID", unique = true, nullable = false, insertable = false, updatable = false)
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long policyId;
#Column(name="CONTEXT_CD")
#Id
private String contextCd;
#Column(name="CASE_ID")
private Long caseId;
#Column(name="EMPLYR_GRP_ID")
private Long emplyrGrpId;
.....
}
Key class as below.
#Embeddable
public class IdGenerationIdentity implements Serializable {
private static final long serialVersionUID = -849058313293035312L;
// #GeneratedValue(strategy = GenerationType.IDENTITY)
//#NotNull
//#Column(name = "POLICY_ID")
//#Id
private Long policyId;
//#NotNull
//#Column(name = "CONTEXT_CD")
private String contextCd;
public IdGenerationIdentity(Long policyId, String contextCd) {
this.policyId = policyId;
this.contextCd = contextCd;
}
public IdGenerationIdentity() {
}
public Long getPolicyId() {
return policyId;
}
public void setPolicyId(Long policyId) {
this.policyId = policyId;
}
public String getContextCd() {
return contextCd;
}
public void setContextCd(String contextCd) {
this.contextCd = contextCd;
}
}
when i try to save to the DB using spring data jpa repository
policyRepository.save(policy);
i gives me an exception as below
ERROR org.springframework.boot.web.servlet.support.ErrorPageFilter - Forwarding to error page from request [/portalCase/createCase] due to exception [Error occurred while creating a new case. Error occurred while inserting policy.Could not set field value [POST_INSERT_INDICATOR] value by reflection : [class com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId] setter of com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId; nested exception is org.hibernate.PropertyAccessException: Could not set field value [POST_INSERT_INDICATOR] value by reflection : [class com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId] setter of com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId] java.lang.Exception: Error occurred while creating a new case. Error occurred while inserting policy.Could not set field value [POST_INSERT_INDICATOR] value by reflection : [class com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId] setter of com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId; nested exception is org.hibernate.PropertyAccessException: Could not set field value [POST_INSERT_INDICATOR] value by reflection : [class com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId] setter of com.hmsy.pierws.portalCase.entity.IdGenerationIdentity.policyId
another approach i have tried is using EmbeddedId. i have commented the same in the entity class above. when i use the embeddedId it gives me
rowid cannot be specified as a target column in insert
Related
I want to load all objects from a table without a lazy objects/children and list them on the page (Thymeleaf template), but I get a LazyInitializationException every time. I tried to convert Hibernate entity objects into a POJO that doesnt contains a lazy/unwanted object but with the same result. I also tried open-in-view parameter set to false...
Simple example:
Parent:
#Entity
public class DocumentDbe implements Serializable {
public DocumentDbe(){
}
#Id
#Column(name = "id", updatable = false, nullable = false)
private Long id;
#OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
private DocumentFileDbe documentFile;
....
}
Child:
#Entity
public class DocumentFileDbe implements Serializable {
public DocumentFileDbe(){}
#Id
#Column(name = "id", updatable = false, nullable = false)
private Long id;
#Column
#Lob
private byte[] documentData;
...
}
POJO:
public class DocumentDto implements Serializable {
public DocumentDto(){
}
public DocumentDto(DocumentDbe doc){
this.id = doc.getId();
}
....
}
Controller:
#GetMapping("/list")
String getList(Model model) {
List<DocumentDbe> docs;
List<DocumentDto> data = new ArrayList<>();
try (Session ses = sessionFactory.openSession()) {
docs = ses.createQuery("FROM DocumentDbe").list();
docs.forEach(doc -> {
data.add(new DocumentDto(doc));
});
}
model.addAttribute(MODEL_LIST_DATA, data);
return "list";
}
EDIT: Thrown exception:
org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/list.html]")] with root cause
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
EDIT2:
In DocumentDbe is relation with another object (EAGER this time so I was not paying attention to it) , which has reference to DocumentDbe again.. chained relationship and LazyInitializationException is created...
EDIT3:
Although
This is modified and working controller, without POJO:
#GetMapping("/list")
String getList(Model model) {
List<DocumentDbe> docs;
try (Session ses = sessionFactory.openSession()) {
docs = ses.createQuery("FROM DocumentDbe ORDER BY id DESC").list();
docs.forEach(doc -> {
doc.setDocumentFile(null);
doc.getHistory().forEach(log ->{
log.setDocument(null);
});
});
}
model.addAttribute(MODEL_ADMIN_DATA, docs);
return "list";
}
In class DocumentDbe you have mark relation as Lazy. In default relation #ManyToOne and #OneToOne is as EAGER, so if you don't want Lazy, you have to change
#OneToOne(cascade = CascadeType.PERSIST)
If you want have #lob also as eager:
#Lob
#Basic( fetch = FetchType.EAGER )
I have two entities and mapped those using many-to-one annotation but after writing a query for find object using another table id I got an error when I commented out that line and method called to that application work but I want to implement that functionality and please help me
These are my entity classes:
#Entity
#Table(name = "Contract")
public class Contract implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "contractId")
private long contractId;
#Column(name="start_date")
private Date st_date;
#Column(name="end_date")
private Date end_date;
#ManyToOne(fetch = FetchType.LAZY, optional = false)
#JoinColumn(name = "hotel_id", nullable = false)
#OnDelete(action = OnDeleteAction.CASCADE)
#JsonIgnore
private Hotel hotel;
// getters and setters
Second entity
#Entity
#Table(name="Hotel")
public class Hotel {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="hotel_id")
private long hotel_id;
#Column(name="hotel_name")
private String hotel_name;
#Column(name="hotel_location")
private String hotel_location;
#Column(name="hotel_email")
private String hotel_email;
#Column(name="hotel_telephone")
private String hotel_telephone
// getters and setters
My contract service class
#Service
public class ContractService {
#Autowired
private ContractRepository contractRepository;
#Autowired
private HotelRepository hotelRepository;
public List<Contract> getAllContracts(){
return contractRepository.findAll();
}
public List<Contract> findByHotelId(Long hotelId,Pageable pageable){
return contractRepository.findByHotelId(hotelId, pageable);
}
public ResponseEntity<?> deleteContract(Long hotelId, Long contractId)
{
return contractRepository.findByIdAndHotelId(contractId,
hotelId).map(Contract -> {
contractRepository.delete(Contract);
return ResponseEntity.ok().build();
}).orElseThrow(() -> new ResourceNotFoundException("Comment not found
with ContractId " + contractId + " and hotelId " + hotelId));
}
My contract repository
#Repository
public interface ContractRepository extends JpaRepository<Contract, Long> {
List<Contract> findByHotelId(Long hotelId, Pageable pageable);
Optional<Contract> findByIdAndHotelId(Long id, Long hotelId);
}
I got this error when running my project
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'contractController': Unsatisfied dependency expressed through field 'contractService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'contractService': Unsatisfied dependency expressed through field 'contractRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'contractRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.sunTravel.sunRest.repository.ContractRepository.findByHotelId(java.lang.Long,org.springframework.data.domain.Pageable)! No property id found for type Hotel! Traversed path: Contract.hotel.
First Solution: based on your stack trace, Spring data is looking for id variable (primary key) in your Hotel class. So please change private long hotel_id; to private long id;
Another solution (no need to change anything just add your own query):
write your own JPA query using #Query.
Example:
#Query("SELECT contract from Contract as contract where contract.hotel.hotel_id = :hotelId")
List<Contract> findByHotelId(Long hotelId, Pageable pageable);
You should rename your Primary Key from hotel_id to id then only your repository method will work.
#Entity
#Table(name="Hotel")
public class Hotel {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="hotel_id")
private long id;
#Column(name="hotel_name")
private String hotel_name;
#Column(name="hotel_location")
private String hotel_location;
#Column(name="hotel_email")
private String hotel_email;
#Column(name="hotel_telephone")
private String hotel_telephone
// getters and setters
I have two entities, Type and TypeValue. Each Type can have several TypeValues. While trying to persist a new TypeValue, I get a database error that Type already exists (which is correct, but I don't want to add it again, I want to add just a new 'TypeValue'). I have similar classes without IdClass that are working, so I assume that either the #IdClass definition is wrong or I forgot to define something so that the referred object is not updated.
How to prevent saving of the referred entity Type when using #IdClass for TypeValue?
Class definitions:
#Entity
#Table(name = "TYPE", schema = "VOC")
public class Type implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#Column(name = "TYPEID")
private String typeID;
#Column(name = "NAME")
private String name;
#OneToMany(mappedBy = "type")
private List<TypeValue> listTypeValue;
// constructor, getter, setter, equals, hashcode, ...
}
#Entity
#IdClass(TypeValueID.class)
#Table(name = "TYPE_VALUE", schema = "VOC")
public class TypeValue implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#ManyToOne
#JoinColumn(name = "TYPEID")
#ForeignKey(name = "TYPEVALUE_FK")
private Type type;
#Id
#Column(name = "VALUE")
private String value;
// constructor, getter, setter, equals, hashcode, ...
}
public class TypeValueID implements Serializable {
private static final long serialVersionUID = 1L;
String type;
String value;
// equals, hashcode
}
Example of usage:
Type type = ... // get existing type with typeID "DETAIL"
Session session = sessionFactory.getCurrentSession();
TypeValue newTypeValue = new TypeValue(type, "new value");
session.save(newTypeValue);
session.flush();
Thrown exception:
SEVERE: Servlet.service() for servlet [spring] in context with path [/project] threw exception [Request processing failed; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause
org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "type_pkey"
Detail: Key (typeid)=(DETAIL) already exists.
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2455)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2155)
...
please change your String typeID to int or long. Then use #GeneratedValue for auto-increment.
#Id
#GeneratedValue(strategy= GenerationType.AUTO)
private int typeID ;
Check this example
#Entity
#Table(name = "USERS")
#Proxy(lazy = false)
public class User {
#Id
#GeneratedValue(strategy= GenerationType.AUTO)
private int uID ;
private String uName ;
private String uEmail ;
private String uPassword;
#OneToMany(cascade=CascadeType.ALL,fetch = FetchType.EAGER)
private List<Reminder> uReminders = new ArrayList<>();
Next Entity
#Entity
#Proxy(lazy = false)
public class Reminder {
#Id
#GeneratedValue(strategy= GenerationType.AUTO)
private int reminderID ;
private Date reminderDate ;
private String reminderDescription ;
You have defined the foreign key column with #Id.
#Id
#ManyToOne
#JoinColumn(name = "TYPEID")
#ForeignKey(name = "TYPEVALUE_FK")
private Type type;
So it is expecting unique value in the column "type".Hope this may help.
The type attribute in the TypeValueID class is wrong, the class should look like this:
public class TypeValueID implements Serializable {
private static final long serialVersionUID = 1L;
Type type;
String value;
// equals, hashcode
}
The JPA Persistence API 2.1 documentation states:
The names of the fields or properties in the primary key class and the
primary key fields or properties of the entity must correspond and
their types must match according to the rules specified in Section
2.4, “Primary Keys and Entity Identity” and Section 2.4.1, “Primary Keys Corresponding to Derived Identities”.
And the rule that applies in this case is:
If the composite primary key class is represented as an id class, the
names of primary key fields or properties in the primary key class and
those of the entity class to which the id class is mapped must
correspond and their types must be the same.
I have build my data model using JPA and am using Hibernate's EntityManager to access the data. I am using this configuration for other classes and have had no problems.
The issue is that I created an entity with a composite primary key (the two keys are foreign keys) , adding elements works perfectly I checked it in database but I am not able to retrieve the populated row from database.
For example if I query "FROM Referentiel" to return a list of all referentiels in the table, I get this [{},{}] my list.size() has the proper number of elements (2), but the elements are null.
The entity:
#Entity
#Table(name = "Et_referentiel")
public class Referentiel implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
#Id
#ManyToOne
#JoinColumn(name = "id_projet")
private Projet projet;
#Id
#ManyToOne
#JoinColumn(name = "id_ressource")
private Ressource ressource;
#Column(name = "unite", nullable = false)
private String unite;
}
here is my controller getList method:
#PostMapping(value = "/list", consumes = { MediaType.APPLICATION_JSON_UTF8_VALUE })
public List<Referentiel> listReferentiel(#RequestBody Long idProjet) {
List<Referentiel> referentiel = referentielService.listReferentiel(idProjet);
return referentiel;
}
and here is my dao methods:
#Autowired
private EntityManager em;
#Override
public void ajouterReferentiel(Referentiel ref) {
em.persist(ref);
em.flush();
}
#SuppressWarnings("unchecked")
#Override
public List<Referentiel> listReferentiel(Long idProjet) {
Query query = em.createQuery("Select r from Referentiel r where r.projet.idProjet=:arg1");
query.setParameter("arg1", idProjet);
em.flush();
List<Referentiel> resultList = query.getResultList();
return resultList;
}
Any help is greatly appreciated.
Try creating a class representing your composite key:
public class ReferentielId implements Serializable {
private static final long serialVersionUID = 0L;
private Long projet; // Same type than idProjet, same name than inside Referentiel
private Long ressource; // Same type than idRessource (I guess), same name than inside Referentiel
// Constructors, getters, setters...
}
And assign it to your entity having that composite key.
#Entity
#IdClass(ReferentielId.class) // <- here
#Table(name = "Et_referentiel")
public class Referentiel implements Serializable {
// ...
}
Notice that it is required to have a class representing your composite keys, even if that does not help in your problem.
I have a MySQL database and I want to retrieve some data as json.
And I have an entity Offre wich has #OneToMany relation with the AssociationCandidatOffre entity.
and I have an api which calles this method in my repository :
offreRepository.findAll();
Offre entity :
#Entity
public class Offre implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "CODE_OFFRE")
private Long codeOffre;
private String titre;
#OneToMany(mappedBy = "offre")
private Collection<AssociationCandidatOffre> associationCandidatOffres;
public Collection<AssociationCandidatOffre> getAssociationCandidatOffres() {
return associationCandidatOffres;
}
public void setAssociationCandidatOffres(Collection<AssociationCandidatOffre> associationCandidatOffres) {
this.associationCandidatOffres = associationCandidatOffres;
}
//... getters/setters
}
AssociationCandidatOffre entity :
#Entity
public class AssociationCandidatOffre implements Serializable {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private Long idAssociation;
private String lettreMotivation;
private String tarifJournalier;
private Date dateDisponibilite;
#ManyToOne
private Candidat candidat;
#ManyToOne
private Offre offre;
#JsonIgnore
#XmlTransient
public Candidat getCandidat() {
return candidat;
}
#JsonSetter
public void setCandidat(Candidat candidat) {
this.candidat = candidat;
}
#JsonIgnore
#XmlTransient
public Offre getOffre() {
return offre;
}
#JsonSetter
public void setOffre(Offre offre) {
this.offre = offre;
}
//... getters/setters
}
the problem is when I call the api /offres to return me a json object I get this error message instead :
Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: could not extract ResultSet (through reference chain: java.util.ArrayList[0]->com.***.Rekrute.entities.Offre["associationCandidatOffres"]);
nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not extract ResultSet (through reference chain: java.util.ArrayList[0]->com.***.Rekrute.entities.Offre["associationCandidatOffres"])
when I use #JsonIgnore in the getAssocationCandidatOffres I dont get any errors but I want that association in the json result as well.
Normally, this shouldn't generate any error since I have #JsonIgnore in the other side of the relation which is getOffre().
how can I solve this problem ?
You can't convert a bidirectional relation of an enitity to JSON.
You get an endless loop.
JSON-Parser starts with the entity Offer and reads the associated AssociationCandidatOffre via getAssociationCandidatOffres(). For every AssociationCandidatOffre the JSON-Parser read getOffre() and starts again. The parser don't know when he must end.