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Issues in one-to-many and many-to-one mapping for three entity classes

I have three entity classes Country, State, and City. Now I am trying to display the cities that come under a particular state and states that come under a particular country. but I am facing an error like
org.springframework.dao.DataAccessResourceFailureException:
Could not create JPA EntityManager;
nested exception is org.hibernate.AnnotationException:
#OneToOne or #ManyToOne on com.region.model.State.cities reference
an unknown entity: java.util.List.
Please help me out in one-to-many and many-to-one mapping for the three tables.
package com.region.model;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.SecondaryTable;
import javax.persistence.Table;
import javax.persistence.Transient;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonManagedReference;
#Entity
#Table(name = "country")
public class Country {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column
private Integer country_id;
#Column
private String country_name;
// #Column
// private String status="active";
#Transient
private String statusCode;
#Transient
private String statusmessage;
#OneToMany(targetEntity=State.class, mappedBy="country",cascade=CascadeType.ALL, fetch = FetchType.LAZY)
#JsonBackReference
private List<State> states;
public Country() {
}
public Integer getCountry_id() {
return country_id;
}
public void setCountry_id(Integer country_id) {
this.country_id = country_id;
}
public String getCountry_name() {
return country_name;
}
public void setCountry_name(String country_name) {
this.country_name = country_name;
}
// public String getStatus() {
// return status;
// }
// public void setStatus(String status) {
// this.status = status;
// }
public String getStatusCode() {
return statusCode;
}
public void setStatusCode(String statusCode) {
this.statusCode = statusCode;
}
public String getStatusmessage() {
return statusmessage;
}
public void setStatusmessage(String statusmessage) {
this.statusmessage = statusmessage;
}
public List<State> getStates() {
return states;
}
public void setStates(List<State> states) {
this.states = states;
}
}
package com.region.model;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Transient;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonManagedReference;
#Entity
#Table(name = "state")
public class State {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column
private Integer sk_state_id;
#Column
private String state_name;
#Column
private String country_id;
// #Column
// private String status="active";
#Transient
private String statusCode;
#Transient String statusMessage;
#ManyToOne()
#JoinColumn(name="country_id", referencedColumnName = "country_id", insertable = false, updatable = false)
#JsonManagedReference
#OneToMany(targetEntity=City.class, mappedBy="state",cascade=CascadeType.ALL, fetch = FetchType.LAZY)
private List<City>cities;
private Country country;
public State() {
}
public Integer getSk_state_id() {
return sk_state_id;
}
public void setSk_state_id(Integer sk_state_id) {
this.sk_state_id = sk_state_id;
}
public String getState_name() {
return state_name;
}
public void setState_name(String state_name) {
this.state_name = state_name;
}
public String getCountry_id() {
return country_id;
}
public void setCountry_id(String country_id) {
this.country_id = country_id;
}
// public String getStatus() {
// return status;
// }
// public void setStatus(String status) {
// this.status = status;
// }
public String getStatusCode() {
return statusCode;
}
public void setStatusCode(String statusCode) {
this.statusCode = statusCode;
}
public String getStatusMessage() {
return statusMessage;
}
public void setStatusMessage(String statusMessage) {
this.statusMessage = statusMessage;
}
public Country getCountry() {
return country;
}
public void setCountry(Country country) {
this.country = country;
}
public List<City> getCities() {
return cities;
}
public void setCities(List<City> cities) {
this.cities = cities;
}
}
package com.region.model;
import java.lang.annotation.Repeatable;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Transient;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonManagedReference;
#Entity
#Table(name = "city")
public class City {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column
private Integer sk_city_id;
#Column
private String city_name;
#Column
private String state_id;
#Column
private String country_id;
#Transient
private String statusCode;
#Transient
String statusMessage;
#ManyToOne(targetEntity = State.class)
#JoinColumn(name="state_id", referencedColumnName ="sk_state_id", insertable = false, updatable = false)
private State state;
private Country country;
//private List<State>states;
public City() {
}
public Integer getSk_city_id() {
return sk_city_id;
}
public void setSk_city_id(Integer sk_city_id) {
this.sk_city_id = sk_city_id;
}
public String getCity_name() {
return city_name;
}
public void setCity_name(String city_name) {
this.city_name = city_name;
}
public String getState_id() {
return state_id;
}
public void setState_id(String state_id) {
this.state_id = state_id;
}
public String getCountry_id() {
return country_id;
}
public void setCountry_id(String country_id) {
this.country_id = country_id;
}
public String getStatusCode() {
return statusCode;
}
public void setStatusCode(String statusCode) {
this.statusCode = statusCode;
}
public String getStatusMessage() {
return statusMessage;
}
public void setStatusMessage(String statusMessage) {
this.statusMessage = statusMessage;
}
public Country getCountry() {
return country;
}
public void setCountry(Country country) {
this.country = country;
}
public State getState() {
return state;
}
public void setState(State state) {
this.state = state;
}
#Override
public String toString() {
return "City [sk_city_id=" + sk_city_id + ", city_name=" + city_name + ", state_id=" + state_id
+ ", country_id=" + country_id + ", statusCode=" + statusCode + ", statusMessage=" + statusMessage
+ "]";
}
// public List<State> getStates() {
// return states;
// }
// public void setStates(List<State> states) {
// this.states = states;
// }
}

mappedBy is only used once in a relationship between 2 classes, for the class that you want to define the relationship for both. So in the class Countries you probably don't need mappedBy at all, in the class Cities, you should put mappedBy="state", and in the class State it would make sense to put mappedBy="country"

Sorting with model reference on PageRequest not working

I am using Spring data PageRequest to search data based on user filter. I need my sort column to be dynamic along with search filters.
However stateMaster.countryMaster.description, stateMaster.description, description code is not working and throws following error.
org.springframework.data.mapping.PropertyReferenceException: No property description, stateMaster found for type CountryMaster! Traversed path: DistrictMaster.stateMaster.countryMaster.
Here's my service code.
String sortColumn = filterJson.getString("sortColumn");
if ("default".equalsIgnoreCase(filterJson.getString("sortColumn"))) {
sortColumn = "stateMaster.countryMaster.description, stateMaster.description, description";
} else {
sortColumn = "description";
}
String sortOrder = filterJson.getString("sortOrder");
Integer maxResult = Integer.parseInt(hbsService.getGeneralConfigValue("adminmaxallowedlisting"));
PageRequest pageRequest = new PageRequest(pageNo, maxResult, Sort.Direction.valueOf(sortOrder), sortColumn);
Page<DistrictMaster> page = districtRepository.findAll(new Specification<DistrictMaster>() {
#Override
public Predicate toPredicate(Root<DistrictMaster> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
List<Predicate> predicates = new ArrayList<>();
if (filterJson.optLong("stateId") != 0) {
predicates.add(criteriaBuilder.and(criteriaBuilder.equal(root.get("stateMaster"), filterJson.optLong("stateId"))));
}
if (!filterJson.optString("status").trim().isEmpty() && !filterJson.optString("status").equals("All")) {
predicates.add(criteriaBuilder.and(criteriaBuilder.equal(root.get("active"), filterJson.optBoolean("status"))));
}
if (!filterJson.optString("value").trim().isEmpty()) {
predicates.add(criteriaBuilder.and(criteriaBuilder.like(criteriaBuilder.lower(root.get("description")), "%" + filterJson.optString("value").toLowerCase() + "%")));
}
return criteriaBuilder.and(predicates.toArray(new Predicate[predicates.size()]));
}
}, pageRequest);
Here's my model:
package com.agrisk.data.model;
import java.io.Serializable;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
#Entity
#Table(name = "tbldistrictmst")
#SequenceGenerator(name = "districtmstseq", allocationSize = 1, sequenceName = "districtmstseq")
public class DistrictMaster extends MakerCheckerBO implements Serializable {
/**
*
*/
private static final long serialVersionUID = 5461420398663313529L;
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "districtmstseq")
#Column(name = "id")
public Long id;
#Column(name = "description")
public String description;
#Column(name = "code")
public String code;
#ManyToOne
#JoinColumn(name = "stateid")
private StateMaster stateMaster;
#Column(name = "active")
public Boolean active;
#OneToMany(fetch = FetchType.LAZY)
#JoinColumn(name = "districtid")
public Set<TehsilMaster> tehsilMaster;
#Column(name = "villagereferenceid")
private Long villageReferenceId;
public Set<TehsilMaster> getTehsilMaster() {
return tehsilMaster;
}
public void setTehsilMaster(Set<TehsilMaster> tehsilMaster) {
this.tehsilMaster = tehsilMaster;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public StateMaster getStateMaster() {
return stateMaster;
}
public void setStateMaster(StateMaster stateMaster) {
this.stateMaster = stateMaster;
}
public Boolean getActive() {
return active;
}
public void setActive(Boolean active) {
this.active = active;
}
public Long getVillageReferenceId() {
return villageReferenceId;
}
public void setVillageReferenceId(Long villageReferenceId) {
this.villageReferenceId = villageReferenceId;
}
}

hql join could not resolve property; use two tables mapping

I have 2 tables prod (goods) with
> id, catid(category), name, price
And cat
> with id, catname.
I wanna select like this in SQL
> select * from cat join prod on cat.id=prod.catid where
> cat.name='catname';
My query is;
Query query = session.createQuery("from prod pr join pr.cat ct with pr.catid=ct.id where ct.name=?");
I have
could not resolve property: cat of: goods.prod [from goods.prod pr
join pr.cat ct with pr.catid=ct.id where ct.name=?]
error
and in indexservice.java i have import goods.cat unused. But why? If i wrote function to use goods.prod that imports goods.cat.
Ok. that was with no mapping. I add this in cat.java
**cat.java**
package goods;
import java.io.Serializable;
import java.util.List;
import java.util.ArrayList;
import goods.prod;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.OneToMany;
import javax.persistence.Table;
#Entity
#Table(name="cat")
public class cat implements Serializable {
private Integer id;
#Id #GeneratedValue
#Column(name="id")
#OneToMany
#JoinColumn(name="catid", referencedColumnName="id")
private List<prod> prods;
private static final long serialVersionUID = -4147058093508047162L;
private String Name;
public cat() {
}
public cat(int id, String Name) {
this.id = id;
this.Name = Name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return Name;
}
public void setName(String Name) {
this.Name = Name;
}
}
prod.java
package goods;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import goods.cat;
import java.io.Serializable;
#Entity
#Table(name = "prod")
public class prod implements Serializable {
#Id #GeneratedValue
#Column(name = "catid")
private Long id;
private Integer catid;
private String name;
private Integer price;
public prod() {
}
public prod(Long id, Integer catid, String name, Integer price) {
this.id = id;
this.catid = catid;
this.name = name ;
this.price = price;
}
public Long getid() {
return id;
}
public void setid(Long id) {
this.id = id;
}
public Integer getcatid() {
return catid;
}
public void setcatid(Integer catid) {
this.catid = catid;
}
public String getname() {
return name;
}
public void setname(String name) {
this.name = name;
}
public Integer getprice() {
return price;
}
public void setprice(Integer price) {
this.price = price;
}
}
IndexService.java
import goods.prod;
import goods.cat;
#SuppressWarnings("unchecked")
public static ArrayList<prod> getListOfProds(String catname,String name,Integer pricel, Integer priceh){
ArrayList<prod> list = new ArrayList<prod>();
Session session = HibernateUtil.openSession();
Transaction tx = null;
try {
tx = session.getTransaction();
tx.begin();
Query query = session.createQuery("from prod pr join pr.cat ct with pr.catid=ct.id where ct.name=?");
//Query query = session.createQuery("from prod pr join pr.cat ct with pr.catid=ct.id where ct.name=?");
query.setString(0, catname);
//query.setInteger(1, pricel);
//query.setInteger(2, priceh);
list = (ArrayList<prod>) query.list();
tx.commit();
} catch (Exception e) {
if (tx != null) {
tx.rollback();
}
e.printStackTrace();
} finally {
session.close();
}
return list;
}

In your prod class (defined in prod.java) you have not mapped a field cat (as object type cat), you have mapped only catId as integer.
So you can't use a join like yours.
You can re-write your query like this:
FROM prod pr, cat ct
WHERE pr.catid = ct.id
AND ct.name = ?

manytoone
another variant
public class prod implements Serializable {
#Id #GeneratedValue
#Column(name = "catid")
#ManyToOne
#JoinColumn(name="cat", referencedColumnName="id")
// private Integer catid;
private Long id;
private cat cat;
private String name;
private Integer price;
#Column(s) not allowed on a #ManyToOne property: goods.prod.id

Join in hibernate with annotaion

I am trying to perform join in hibernate and i am using struts2.
I am working with hibernate using annotaions. Now i am unable to perform join between two tables.My first table is "studentprojects" which contain pid and email.Second table is "initialprojectdetials" which contains pid,name,description... similarly some other fields.I have to get the data of second table by performing join around pid of first table.
For this am using this query:
String hql="from InitialProjectDTO I join I.projectId S where I.projectId=:id";
Query query=session.createQuery(hql);
query.setParameter("id", id);
mail =query.list();
where mail is the arraylist of InitialProjectDTO.
And my InitialProjectDTO is:
package edu.pma.dto;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.OneToMany;
import javax.persistence.Table;
#Entity
#Table(name="initialprojectdetail")
public class InitialProjectDTO {
#Id
#Column(name="projectId")
#OneToMany(cascade=CascadeType.ALL)
#JoinTable(name="studentprojects",joinColumns=#JoinColumn(name="projectId"))
int projectId;
#Column(name="name")
String name;
#Column(name="description")
String description;
#Column(name="technology")
String technology;
#Column(name="guide")
String guide;
#Column(name="duration")
int duration;
#Column(name="status")
String status;
#Column(name="report")
String report;
public String getReport() {
return report;
}
public void setReport(String report) {
this.report = report;
}
public int getProjectId() {
return projectId;
}
public void setProjectId(int projectId) {
this.projectId = projectId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getTechnology() {
return technology;
}
public void setTechnology(String technology) {
this.technology = technology;
}
public String getGuide() {
return guide;
}
public void setGuide(String guide) {
this.guide = guide;
}
public int getDuration() {
return duration;
}
public void setDuration(int duration) {
this.duration = duration;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}
my SudentProjectDTO is:
package edu.pma.dto;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="studentprojects")
public class StudentProjectDTO {
public int getProjectId() {
return projectId;
}
public void setProjectId(int projectId) {
this.projectId = projectId;
}
#Id
#Column(name="email")
String email;
#Column(name="projectId")
int projectId;
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
This is the error which i am getting:
Illegal attempt to map a non collection as a #OneToMany, #ManyToMany or #CollectionOfElements: edu.pma.dto.InitialProjectDTO.projectId
Method "execute" failed for object edu.pma.actions.LoginAction#1096a56
File: org/hibernate/cfg/annotations/CollectionBinder.java

You should try to use different models
#Entity
public class InitialProjectDTO {
#OneToMany(mappedBy = "project")
private Collection<StudentProjectDTO> students;
}
#Entity
public class StudentProjectDTO {
#ManyToOne
private InitialProjectDTO project;
}
And with the proper model it shuld be easy to write hql, you might want to look here for examples https://docs.jboss.org/hibernate/orm/3.3/reference/en/html/queryhql.html.
Also I would suggest to look here for example of models. http://viralpatel.net/blogs/hibernate-one-to-many-annotation-tutorial/

See following example might its help to you
#Entity
#Table(name="initialprojectdetail")
public class InitialProjectDTO {
private Integer initialProjectDTOId;
private Set<StudentProjectDTO > studentProjectDTO = new HashSet<StudentProjectDTO >(0);
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name = "initial_projectDTO_id", unique = true, nullable = false)
public Integer getInitialProjectDTOId() {
return this.initialProjectDTOId;
}
public void setInitialProjectDTOId(Integer initialProjectDTOId) {
this.initialProjectDTOId = initialProjectDTOId;
}
#OneToMany(mappedBy = "studentprojects", cascade = CascadeType.ALL, fetch=FetchType.LAZY)
public Set<StudentProjectDTO> getUserRole() {
return this.studentProjectDTO;
}
public void setUserRole(Set<StudentProjectDTO> studentProjectDTO) {
this.studentProjectDTO = studentProjectDTO;
}
}
#Entity
#Table(name="studentprojects")
public class StudentProjectDTO {
private InitialProjectDTO project;
#ManyToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "initial_projectDTO_id", nullable = false)
public User getProject() {
return this.project;
}
public void setProject(InitialProjectDTO project) {
this.project = project;
}
}
your Query shoud be something like this
String hql="SELECT ip from InitialProjectDTO ip JOIN ip.studentProjectDTO sp WHERE sp.projectId = :id";
Query query=session.createQuery(hql);
query.setParameter("id", id);
mail =query.list();

Mapped Entity null on #OneToOne with #JoinColumn

I get the mapped entity always null but, FetchType.EAGER is set already. I have a Booking entity class that maps to two other entities - Slot and Subscriber. Both the entities are null when I fetch the booking entity
Booking class
import java.util.Date;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Version;
#Entity
#Table(name = "BOOKING")
public class Booking {
public Booking(){
}
#Id #GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name = "id")
private Integer id;
#Column(name = "title")
private String title;
#Column(name = "descr")
private String desc;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name = "slotid",insertable = false, updatable = false)
private Slot slot;
private Integer slotid;
private Integer subscriberid;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name = "subscriberid",insertable = false, updatable = false)
private User subscriber;
#Column(name = "created")
#Temporal(TemporalType.TIMESTAMP)
private Date created;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name = "slotid",referencedColumnName="slotid")
public Slot getSlot() {
return slot;
}
public void setSlot(Slot slot) {
this.slot = slot;
}
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name = "subscriberid",referencedColumnName="userid")
public User getSubscriber() {
return subscriber;
}
public void setSubscriber(User subscriber) {
this.subscriber = subscriber;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public Integer getSlotid() {
return slotid;
}
public void setSlotid(Integer slotid) {
this.slotid = slotid;
}
public Integer getSubscriberid() {
return subscriberid;
}
public void setSubscriberid(Integer subscriberid) {
this.subscriberid = subscriberid;
}
}
Slot class
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Version;
#Entity
#Table(name="SLOT")
public class Slot {
public Slot(){
}
#Id #GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name="slotid")
private Integer id;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name="ownerid",insertable = false, updatable = false)
private User user;
#Column(name="startdate")
private Date startdate;
#Column(name="enddate")
private Date enddate;
#Column(name="status")
private String status;
private Integer ownerid;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created", nullable = false, updatable=false)
#Version
private Date created;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public User getUser() {
return this.user;
}
public void setUser(User owner) {
this.user = owner;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public Integer getOwnerid() {
return ownerid;
}
public void setOwnerid(Integer ownerid) {
this.ownerid = ownerid;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public Date getStartdate() {
return startdate;
}
public void setStartdate(Date startdate) {
this.startdate = startdate;
}
public Date getEnddate() {
return enddate;
}
public void setEnddate(Date enddate) {
this.enddate = enddate;
}
}
Subscriber - User class
import java.util.Date;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
#Entity
#Table(name="users")
public class User {
public User(){
}
#Id#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="userid")
private Integer userid = 0;
#Column(name = "name")
private String name;
#Column(name = "mobile")
private String mobile;
#Column(name = "password")
private String password;
#Column(name = "email")
private String email;
#Column(name = "type")
private String userType;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name="cityid",insertable = false, updatable = false)
private City city;
private String cityid;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name="specialityid",insertable = false, updatable = false)
private Speciality speciality;
private Integer specialityid;
#Column(name="medregno")
private String regno;
#Column(name="refcode")
private String referalcode;
public String getRegno() {
return regno;
}
public void setRegno(String regno) {
this.regno = regno;
}
public String getReferalcode() {
return referalcode;
}
public void setReferalcode(String referalcode) {
this.referalcode = referalcode;
}
#Column(name = "gender")
private String gender;
#Column(name = "active")
private boolean active;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "updated")
private Date updated;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created")
private Date created;
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
User other = (User) obj;
if (userid != other.userid)
return false;
return true;
}
public Integer getUserid() {
return userid;
}
public void setUserid(Integer userid) {
this.userid = userid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMobile() {
return mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getUserType() {
return userType;
}
public void setUserType(String userType) {
this.userType = userType;
}
public City getCity() {
return city;
}
public void setCity(City city) {
this.city = city;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public Date getUpdated() {
return updated;
}
public void setUpdated(Date updated) {
this.updated = updated;
}
public String getCityid() {
return cityid;
}
public void setCityid(String cityid) {
this.cityid = cityid;
}
public Speciality getSpeciality() {
return speciality;
}
public void setSpeciality(Speciality speciality) {
this.speciality = speciality;
}
public Integer getSpecialityid() {
return specialityid;
}
public void setSpecialityid(Integer specialityid) {
this.specialityid = specialityid;
}
}
booking.getSlot() and booking.getSubscriber() returns null
Please let me know if i miss some configuration while mapping
EDIT1
Added code how the entity is getting loaded
public Booking addBooking(String title,String desc,int slotid,int subscriberid,Session session){
Booking booking = new Booking();
booking.setTitle(title);
booking.setDesc(desc);
booking.setSlotid(slotid);
booking.setSubscriberid(subscriberid);
booking.setCreated(new Date());
Integer bookingid = (Integer) session.save(booking);
session.flush();
Booking bookingEntity = (Booking) session.createQuery("From Booking where id = ?").
setParameter(0, bookingid).list().get(0);
return bookingEntity;
}
I am saving the entity and reloading it.

It's not working because Hibernate is retuning the same instance it has already in its 1st level cache, which doesn't have a reference to any of the 2 other entities.
To fix this, you have to do a session.refresh(booking) rather than executing a query.

In your code :
booking.setSlotid(slotid);
booking.setSubscriberid(subscriberid);
You're just setting Integer values and not objects. Instead of this, try to set objects :
booking.setSlot(new Slot(slotid));
booking.setSubscriber(new Subscriber(subscriberid));
But as #Augusto said, the associations you're having in the session (Slot and Subscriber) are not full objects they contain only their ids. That's why you can't get other fields of these objects.