We Keep Coding

Error in composite key in Hibernate org.hibernate.MappingException: Could not determine type for: java.util.Set,

Friends I have stuck in a Problem in Hibernate composite key.
Error : org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: IDP_UserManagerMapping, for columns: [org.hibernate.mapping.Column(idps)].I have Tried wit #transient and other things but not effective Please Help.
public class IDPUserManagerMapping implements Serializable {
private Long id;
private Users user;
private Users manager;
private Users assessor;
#OneToMany(fetch = FetchType.LAZY)
#JoinColumns({
#JoinColumn(name="user_id" ,referencedColumnName = "user_id"),
#JoinColumn(name="manager_id" ,referencedColumnName = "manager_id")
,#JoinColumn(name="assessor_id" ,referencedColumnName = "assessor_id")
})
#Cascade(CascadeType.ALL)
private Set<IDPMaster> idps = null;
#Id
#SequenceGenerator(sequenceName="idp_usermanagermapping_id_seq",name="idp_usermanagermapping_id_seq_gen")
#GeneratedValue(generator="idp_usermanagermapping_id_seq_gen")
#Column(name="id",nullable=false,unique=true,updatable=false)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Set<IDPMaster> getIdps() {
return idps;
}
public void setIdps(Set<IDPMaster> idps) {
this.idps = idps;
}
#ManyToOne(fetch=FetchType.LAZY)
#JoinColumn(name="user_id",nullable=false)
public Users getUser() {
return user;
}
public void setUser(Users user) {
this.user = user;
}
#ManyToOne(fetch=FetchType.LAZY)
#JoinColumn(name="manager_id",nullable=false)
public Users getManager() {
return manager;
}
public void setManager(Users manager) {
this.manager = manager;
}
#ManyToOne(fetch=FetchType.LAZY)
#JoinColumn(name="assessor_id")
public Users getAssessor() {
return assessor;
}
public void setAssessor(Users assessor) {
this.assessor = assessor;
}
}
Second Entity
public class IDPMaster implements Serializable {
private Long id;
private Users managerUser;
private Users assessorUser;
private Users idpUsers;
#Id
#SequenceGenerator(name="idp_master_id_seq_gen",sequenceName="idp_master_id_seq")
#GeneratedValue(generator="idp_master_id_seq_gen")
#Column(name="id",nullable=false,unique=true)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
#ManyToOne(fetch=FetchType.LAZY)
#JoinColumn(name="user_id",nullable=false)
public Users getIdpUsers() {
return idpUsers;
}
public void setIdpUsers(Users idpUsers) {
this.idpUsers = idpUsers;
}
#OneToOne(fetch=FetchType.LAZY)
#JoinColumn(name="manager_id")
public Users getManagerUser() {
return managerUser;
}
public void setManagerUser(Users managerUser) {
this.managerUser = managerUser;
}
#OneToOne(fetch=FetchType.LAZY)
#JoinColumn(name="assessor_id")
public Users getAssessorUser() {
return assessorUser;
}
public void setAssessorUser(Users assessorUser) {
this.assessorUser = assessorUser;
}
}

You should move the annotations
#OneToMany(fetch = FetchType.LAZY)
#JoinColumns({
#JoinColumn(name="user_id" ,referencedColumnName = "user_id"),
#JoinColumn(name="manager_id" ,referencedColumnName = "manager_id")
,#JoinColumn(name="assessor_id" ,referencedColumnName = "assessor_id")
})
#Cascade(CascadeType.ALL)
from private Set<IDPMaster> idps = null; to public Set<IDPMaster> getIdps() getter
Hibernate analyzes annotations by ID column and if you use annotations on getter there you should use getter annotations everywhere.

MySQLIntegrityConstraintViolationException: column "question_id" cannot be null error

i have two entity classes named Qa.java and Answeres.java
my Qa entity consists of lists of answers.
Qa.Java
#Entity
#Table(name = "qa")
public class Qa {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
private String question;
private String type;
private String description;
private String param;
private int maxlength;
#OneToMany(mappedBy = "qa", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<Answers> answersList = new ArrayList<>();
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getParam() {
return param;
}
public void setParam(String param) {
this.param = param;
}
public int getMaxlength() {
return maxlength;
}
public void setMaxlength(int maxlength) {
this.maxlength = maxlength;
}
public List<Answers> getAnswersList() {
return answersList;
}
public void setAnswersList(List<Answers> answersList) {
this.answersList = answersList;
}
}
Answers.java
#Entity
#Table(name = "answers")
public class Answers {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String ans_label;
private int ans_value;
private int ans_weightage;
private int is_default;
#ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name = "question_id", referencedColumnName = "id",nullable = false)
private Qa qa;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAns_label() {
return ans_label;
}
public void setAns_label(String ans_label) {
this.ans_label = ans_label;
}
public int getAns_value() {
return ans_value;
}
public void setAns_value(int ans_value) {
this.ans_value = ans_value;
}
public int getAns_weightage() {
return ans_weightage;
}
public void setAns_weightage(int ans_weightage) {
this.ans_weightage = ans_weightage;
}
public int getIs_default() {
return is_default;
}
public void setIs_default(int is_default) {
this.is_default = is_default;
}
public Qa getQa() {
return qa;
}
public void setQa(Qa qa) {
this.qa = qa;
}
}
My controller from where i am trying to insert data.
TableDataController.java
#Controller
public class TabletDataController {
#Autowired
QaRepository qaRepository;
#RequestMapping(value = "/saveApiData", method = RequestMethod.GET)
public void saveApiData(){
Qa qa = new Qa();
qa.setParam("");
qa.setType("input_spinner");
qa.setDescription("");
qa.setQuestion("व्यक्तिको पहिलो नाम ?");
ArrayList<Answers> answersArrayList = new ArrayList<>();
Answers answers = new Answers();
answers.setAns_label("नेपाली");
answers.setAns_value(1);
answers.setAns_weightage(0);
answers.setIs_default(0);
answersArrayList.add(answers);
qa.setAnswersList(answersArrayList);
qaRepository.save(qa);
}
}
my qaRepository extends JpaRepository. so whenever i call this api i get an error of com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'question_id' cannot be null
what am i doing wrong?

You have a bidirectional OneToMany relationship, so you need to manually maintain both sides of the relationship. Here you are only setting the Qa side with qa.setAnswersList(answersArrayList);
You need to set the other side of your relationship manually. add:
answers.setQa(qa);
before you save your list

code as follow
public void saveApiData(){
Qa qa = new Qa();
qa.setParam("");
qa.setType("input_spinner");
qa.setDescription("");
qa.setQuestion("व्यक्तिको पहिलो नाम ?");
ArrayList<Answers> answersArrayList = new ArrayList<>();
Answers answers = new Answers();
answers.setAns_label("नेपाली");
answers.setAns_value(1);
answers.setAns_weightage(0);
answers.setIs_default(0);
answers.setQa(qa);
answersArrayList.add(answers);
qa.setAnswersList(answersArrayList);
qaRepository.save(qa);
}
when you save.you should Cascade save.Your annotations configure the relationship of the associated tables but also to associate them when they are saved

Spring JPA, stackoverflow about ManyToMany

I have a ManyToMany relation between EXPERIENCE and COMPETENCE_LEVEL.
I tried:
PROFIL.java:
#Entity
#Table(name="profil")
public class Profil {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id_profil")
private Long idProfil;
public Profil() {
super();
}
public Long getIdProfil() {
return idProfil;
}
public void setIdProfil(Long idProfil) {
this.idProfil = idProfil;
}
#Override
public String toString() {
//[...]
}
}
EXPERIENCE.java:
#Entity
#Table(name="experience")
public class Experience {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id_experience")
private Long idExperience;
#ManyToOne
#JoinColumn(name="id_profil")
private Profil idProfil;
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(name = "experience_competence_level", joinColumns = #JoinColumn(name = "id_experience", referencedColumnName = "id_experience"), inverseJoinColumns = #JoinColumn(name = "id_competence_level", referencedColumnName = "id_competence_level"))
private List<CompetenceLevel> competenceLevels;
public Experience() {
super();
idProfil = new Profil();
}
public Long getIdExperience() {
return idExperience;
}
public void setIdExperience(Long idExperience) {
this.idExperience = idExperience;
}
public Profil getIdProfil() {
return idProfil;
}
public void setIdProfil(Profil idProfil) {
this.idProfil = idProfil;
}
public List<CompetenceLevel> getCompetenceLevels() {
return competenceLevels;
}
public void setCompetenceLevels(List<CompetenceLevel> competenceLevels) {
this.competenceLevels = competenceLevels;
}
#Override
public String toString() {
// [...]
}
}
COMPETENCE_LEVEL.java:
#Entity
#Table(name="competence_level")
public class CompetenceLevel {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id_competence_level")
private Long idCompetenceLevel;
#OneToOne
#JoinColumn(name="id_level")
private Level level;
#OneToOne
#JoinColumn(name="id_profil")
private Profil profil;
#ManyToMany(mappedBy = "competenceLevels")
private List<Experience> experiences;
public CompetenceLevel() {
super();
}
public Long getIdCompetenceLevel() {
return idCompetenceLevel;
}
public void setIdCompetenceLevel(Long idCompetenceLevel) {
this.idCompetenceLevel = idCompetenceLevel;
}
public Level getLevel() {
return level;
}
public void setLevel(Level level) {
this.level = level;
}
public Profil getProfil() {
return profil;
}
public void setProfil(Profil profil) {
this.profil = profil;
}
public List<Experience> getExperiences() {
return experiences;
}
public void setExperiences(List<Experience> experiences) {
this.experiences = experiences;
}
#Override
public String toString() {
// [...]
}
}
When I launch a web service which trying to get all my EXPERIENCE, my execution is freezing and it's feels like a stackoverflow issue (i'm not an expert) :/.
But, if I remove the List in CompetenceLevel class, it's working.
I don't understand why. I follow this tuto : https://hellokoding.com/jpa-many-to-many-relationship-mapping-example-with-spring-boot-maven-and-mysql/
Do you have an idea ? Thanks.

NullPointerException when adding Employee in Hibernate

I have a Hibernate Entity "Intranet" which has this code:
// Imports removed
#Entity
#Table(name = "intranets", uniqueConstraints = #UniqueConstraint(columnNames = "company_name"))
#Cacheable
#Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class Intranet {
#Id
#Column(name = "INTRANET_ID")
#GeneratedValue(strategy = GenerationType.AUTO)
private int intranetId;
#Column(name = "owner_id")
private int ownerId;
#Column(name = "setup_done")
private boolean isSetUp = false;
#Column(name = "company_name")
private String companyName;
#ElementCollection
#CollectionTable(name = "employees")
#Column(name = "employee")
private List<Integer> employeeIds;
public int getIntranetId() {
return intranetId;
}
public void setIntranetId(int intranetId) {
this.intranetId = intranetId;
}
public boolean isSetUp() {
return isSetUp;
}
public void setSetUp(boolean isSetUp) {
this.isSetUp = isSetUp;
}
public String getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public int getOwnerId() {
return ownerId;
}
public void setOwnerId(int ownerId) {
this.ownerId = ownerId;
}
public List<Integer> getEmployeeIds() {
return employeeIds;
}
public void setEmployeeIds(List<Integer> employeeIds) {
this.employeeIds = employeeIds;
}
public void addEmployee(int id) {
this.employeeIds.add(id);
}
public void removeEmployee(int id) {
this.employeeIds.remove(new Integer(id));
}
}
As you can see, I added two methods that don't directly are getters and setters but they're like convenience methods to have easy access to the collection and adding/removing employees.
When I call "addEmployee()" in my program, I am getting a simple NullPointerException. The question basically is how I can initialize the collection to not have null because I read that Hibernate uses internal implementations of collections and does not simply takes ArrayList.
Thanks for help in advance.

You have a NullPointerException because you have to initialize the list yourself. It does not matter which implementation you use. This will fix your problem:
#ElementCollection
#Column(name = "employee")
private List<Integer> employeeIds = new ArrayList<>();

Mapping ManyToMany with composite Primary key and Annotation:

I'm trying to create manytomany realation between Student and Teaching Course using Composite Primary key:
my classes:
#Entity
#Table(name="Student_mtm_cId")
public class Student {
private String id;
private Set<StudentTClass> teachingClasses = new HashSet<StudentTClass>();
#OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.student")
public Set<StudentTClass> getTeachingClasses() {
return teachingClasses;
}
public void setTeachingClasses(Set<StudentTClass> teachingClasses) {
this.teachingClasses = teachingClasses;
}
public void addStudentToClass(TeachingClass teachingClass){
StudentTClass studentTClass = new StudentTClass();
studentTClass.setStudent(this);
studentTClass.setTeachingClass(teachingClass);
teachingClasses.add(studentTClass);
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
#Id #GeneratedValue(generator="system-uuid")
#GenericGenerator(name="system-uuid", strategy = "uuid")
#Column(name = "student_id", nullable = false)
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
//all other setters and getters and isequal/hashCode omitted.
}
TeachingClass:
#Entity
#Table(name="TechingClass_MTM")
public class TeachingClass {
private String id;
private String name;
private String description;
private Set<StudentTClass> teachingClasses = new HashSet<StudentTClass>();
public TeachingClass(){}
public TeachingClass(String name, String description) {
super();
this.name = name;
this.description = description;
}
public void addStudentToClass(Student student){
StudentTClass studentTClass = new StudentTClass();
studentTClass.setStudent(student);
studentTClass.setTeachingClass(this);
teachingClasses.add(studentTClass);
}
#OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.teachingClass")
public Set<StudentTClass> getTeachingClasses() {
return teachingClasses;
}
public void setTeachingClasses(Set<StudentTClass> teachingClasses) {
this.teachingClasses = teachingClasses;
}
public void setDescription(String description) {
this.description = description;
}
#Id #GeneratedValue(generator="system-uuid")
#GenericGenerator(name="system-uuid", strategy = "uuid")
#Column(name = "teachingClass_id", nullable = false)
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
Collection Objects:
#Entity
#Table(name = "student_TClass_MTM")
#AssociationOverrides({
#AssociationOverride(name = "pk.student", joinColumns = #JoinColumn(name = "student_id")),
#AssociationOverride(name = "pk.teachingClass", joinColumns = #JoinColumn(name = "teachingClass_id"))
})
public class StudentTClass {
#EmbeddedId
private StudentTClassPK pk = new StudentTClassPK();
public StudentTClassPK getPk() {
return pk;
}
public void setPk(StudentTClassPK pk) {
this.pk = pk;
}
public StudentTClass() {}
#Transient
public Student getStudent(){
return this.pk.getStudent();
}
#Transient
public TeachingClass getTeachingClass(){
return this.pk.getTeachingClass();
}
public void setStudent(Student student){
this.pk.setStudent(student);
}
public void setTeachingClass(TeachingClass teachingClass){
this.pk.setTeachingClass(teachingClass);
}
}
Now The primary Key:
#Embeddable
public class StudentTClassPK implements Serializable{
private static final long serialVersionUID = -7261887879839337877L;
private Student student;
private TeachingClass teachingClass;
#ManyToOne
public Student getStudent() {
return student;
}
public void setStudent(Student student) {
this.student = student;
}
#ManyToOne
public TeachingClass getTeachingClass() {
return teachingClass;
}
public void setTeachingClass(TeachingClass teachingClass) {
this.teachingClass = teachingClass;
}
public StudentTClassPK(Student student, TeachingClass teachingClass) {
this.student = student;
this.teachingClass = teachingClass;
}
public StudentTClassPK() {}
}
When I'm trying to Persist Student I got the following error:
Caused by: org.hibernate.MappingException: Could not determine type for: com.vanilla.objects.Student, at table: student_TClass_MTM, for columns: [org.hibernate.mapping.Column(student)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:306)
at org.hibernate.tuple.PropertyFactory.buildStandardProperty(PropertyFactory.java:143)
at org.hibernate.tuple.component.ComponentMetamodel.<init>(ComponentMetamodel.java:68)
at org.hibernate.mapping.Component.buildType(Component.java:184)
at org.hibernate.mapping.Component.getType(Component.java:177)
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:290)
at org.hibernate.mapping.RootClass.validate(RootClass.java:236)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1362)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1865)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:855)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:774)
at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
... 51 more
What am I doing wrong?

I solved this issue. I mapped Getter instead of field.
public class StudentTClass {
//#EmbeddedId
private StudentTClassPK pk = new StudentTClassPK();
#EmbeddedId
public StudentTClassPK getPk() {
return pk;
}

If you can, I'd seriously suggest removing the composite keys. Worth with simple primary keys can both make a lot of problems go away and simplify your code. I have used composite keys in a database in the past because I had no ability to modify the db. Unfortunately I don't have the code. But I do remember it took some work to get it all working correctly. Sorry, can't help more.