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org.springframework.orm.jpa.JpaSystemException: Error accessing field by reflection for persistent property

I am using Spring Boot (v 2.4.0) with Hibernate 5.4.24 and, when trying to get some information from my database, I keep getting this error message:
org.springframework.orm.jpa.JpaSystemException: Error accessing field [private int es.uc3m.orders.model.Shoppingcart.usID] by reflection for persistent property [es.uc3m.orders.model.Shoppingcart#usID] : 1; nested exception is org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private int es.uc3m.orders.model.Shoppingcart.usID] by reflection for persistent property [es.uc3m.orders.model.Shoppingcart#usID] : 1
It is kind of weird for me, because it only happens when I try to access the table Shoppingcart, since I can get informatin from the rest of the tables.
I also used the exact same entities with another project but, insetad of using Spring Boot, persistence was made with EntityManagers and it worked perfectly fine.
These are my entities:
Shoppingcart
#Entity
#NamedQuery(name="Shoppingcart.findAll", query="SELECT s FROM Shoppingcart s")
public class Shoppingcart implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int scID;
private int usID;
//bi-directional many-to-many association to Product
#ManyToMany
#JoinTable(
name="sc_has_product"
, joinColumns={
#JoinColumn(name="scID")
}
, inverseJoinColumns={
#JoinColumn(name="productID")
}
)
private List<Product> products;
//bi-directional one-to-one association to User
#OneToOne(mappedBy="shoppingcart")
private User user;
public Shoppingcart() {
}
public int getScID() {
return this.scID;
}
public void setScID(int scID) {
this.scID = scID;
}
public int getusID() {
return this.usID;
}
public void setusID(int usID) {
this.usID = usID;
}
public List<Product> getProducts() {
return this.products;
}
public void setProducts(List<Product> products) {
this.products = products;
}
public User getUser() {
return this.user;
}
public void setUser(User user) {
this.user = user;
}
public boolean isNull() {
return getProducts().isEmpty();
}
User
#Entity
#Table(name="users")
#NamedQuery(name="User.findAll", query="SELECT u FROM User u")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String address;
#Column(name="card_n")
private Long cardN;
private String city;
private String country;
private int cvv;
private String email;
private String exp;
private String name;
private String pass;
private String surname1;
private String surname2;
private String typeOfUser;
#Column(name="zip_code")
private int zipCode;
//bi-directional many-to-one association to Order
#OneToMany(mappedBy="user")
private List<Orders> orders;
//bi-directional many-to-one association to Product
#OneToMany(mappedBy="user")
private List<Product> products;
//bi-directional one-to-one association to Shoppingcart
#OneToOne(cascade=CascadeType.REMOVE)
#JoinColumn(name="ID", referencedColumnName="usID", insertable=false, updatable=false)
private Shoppingcart shoppingcart;
public User() {
}
public int getId() {
return this.id;
}
public void setId(int id) {
this.id = id;
}
public String getAddress() {
return this.address;
}
public void setAddress(String address) {
this.address = address;
}
public Long getCardN() {
return this.cardN;
}
public void setCardN(Long cardN) {
this.cardN = cardN;
}
public String getCity() {
return this.city;
}
public void setCity(String city) {
this.city = city;
}
public String getCountry() {
return this.country;
}
public void setCountry(String country) {
this.country = country;
}
public int getCvv() {
return this.cvv;
}
public void setCvv(int cvv) {
this.cvv = cvv;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getExp() {
return this.exp;
}
public void setExp(String exp) {
this.exp = exp;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getPass() {
return this.pass;
}
public void setPass(String pass) {
this.pass = pass;
}
public String getSurname1() {
return this.surname1;
}
public void setSurname1(String surname1) {
this.surname1 = surname1;
}
public String getSurname2() {
return this.surname2;
}
public void setSurname2(String surname2) {
this.surname2 = surname2;
}
public int getZipCode() {
return this.zipCode;
}
public void setZipCode(int zipCode) {
this.zipCode = zipCode;
}
public List<Orders> getOrders() {
return this.orders;
}
public void setOrders(List<Orders> orders) {
this.orders = orders;
}
public Orders addOrder(Orders order) {
getOrders().add(order);
order.setUser(this);
return order;
}
public Orders removeOrder(Orders order) {
getOrders().remove(order);
order.setUser(null);
return order;
}
public List<Product> getProducts() {
return this.products;
}
public void setProducts(List<Product> products) {
this.products = products;
}
public Product addProduct(Product product) {
getProducts().add(product);
product.setUser(this);
return product;
}
public Product removeProduct(Product product) {
getProducts().remove(product);
product.setUser(null);
return product;
}
public Shoppingcart getShoppingcart() {
return this.shoppingcart;
}
public void setShoppingcart(Shoppingcart shoppingcart) {
this.shoppingcart = shoppingcart;
}
public String getTypeOfUser() {
return typeOfUser;
}
public void setTypeOfUser(String typeOfUser) {
this.typeOfUser = typeOfUser;
}
}
This is the ShoppingcartDAO class:
public interface ShoppingCartDAO extends CrudRepository<Shoppingcart, Integer> {
#Query("SELECT s FROM Shoppingcart s JOIN User u ON u.id = s.usID AND u.id LIKE :id")
Shoppingcart findByUser(#Param("id") int id);
#Query("SELECT s FROM Shoppingcart s")
List<Shoppingcart> findAllShoppingCart();
}
And, finally, this is my ShoppingcartController class:
#RestController
#CrossOrigin
#EnableAutoConfiguration
public class ShoppingCartController {
#Autowired
ShoppingCartDAO scDAO;
#RequestMapping(value = "sc", method = RequestMethod.POST, produces = "application/json")
public ResponseEntity<?> assignShoppingCart(#RequestBody(required = true) Shoppingcart sc) {
try {
scDAO.save(sc);
return new ResponseEntity<Void>(HttpStatus.CREATED);
} catch(Exception e) {
return new ResponseEntity<Void>(HttpStatus.BAD_REQUEST);
}
}
#RequestMapping(value = "sc", method = RequestMethod.GET, produces = "application/json")
public ResponseEntity<?> getEveryShoppingCart() {
try {
List<Shoppingcart> sc = scDAO.findAllShoppingCart();
return new ResponseEntity<List<Shoppingcart>>(sc, (sc != null) ? HttpStatus.OK : HttpStatus.NOT_FOUND);
} catch(Exception e) {
System.out.println(e);
return new ResponseEntity<Void>(HttpStatus.BAD_REQUEST);
}
}
}
I am really going nuts as I can´t figure out what is going on with my code, so thank you in advance if you help me.

I finally fixed it. For those of you who are wondering how, I deleted the relationships between tables that I had, ending with:
Shoppingcart:
#Entity
public class Shoppingcart implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int scID;
#Column(name = "usID")
private Integer userID;
public Shoppingcart() {
}
public int getScID() {
return this.scID;
}
public void setScID(int scID) {
this.scID = scID;
}
public Integer getUserID() {
return userID;
}
public void setUserID(Integer userID) {
this.userID = userID;
}
Product:
#Entity
public class Product implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int productID;
private String category;
private String color;
private String description;
private String estadoProducto;
private String fecha;
private int orderID;
private String photo;
private double price;
private int seller;
private String sexo;
private String state = "Disponible";
private String talla;
private String title;
public Product() {
}
public int getProductID() {
return this.productID;
}
public void setProductID(int productID) {
this.productID = productID;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getColor() {
return this.color;
}
public void setColor(String color) {
this.color = color;
}
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
public String getEstadoProducto() {
return this.estadoProducto;
}
public void setEstadoProducto(String estadoProducto) {
this.estadoProducto = estadoProducto;
}
public String getFecha() {
return this.fecha;
}
public void setFecha(String fecha) {
this.fecha = fecha;
}
public String getPhoto() {
return this.photo;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public double getPrice() {
return this.price;
}
public void setPrice(double price) {
this.price = price;
}
public String getSexo() {
return this.sexo;
}
public void setSexo(String sexo) {
this.sexo = sexo;
}
public String getState() {
return this.state;
}
public void setState(String state) {
this.state = state;
}
public String getTalla() {
return this.talla;
}
public void setTalla(String talla) {
this.talla = talla;
}
public String getTitle() {
return this.title;
}
public void setTitle(String title) {
this.title = title;
}
public int getOrderID() {
return orderID;
}
public void setOrderID(int orderID) {
this.orderID = orderID;
}
public int getSeller() {
return seller;
}
public void setSeller(int seller) {
this.seller = seller;
}
With this, everything worked fine, but don't ask me why, because I don't know it.

Your Getters/Setters are wrongly implemented.
Like :
Actual :
public int getusID() {
return this.usID;
}
Expected :
public int getUsID() {
return this.usID;
}
Same with setter

Get data from Junction Table with Android Room

I am currently building an android app, which displays a Route, which is constructed out of multiple waypoints. I already planned the database schema (chen-notation [possibly invalid "syntax"]):
I tried to recreate the n-m relation with android room, but I can't figure out how I can retrieve the index_of_route attribute of the junction table (route_waypoint).
I want the junction table attribute index_of_route, when I get the Data like so:
#Transaction
#Query("SELECT * FROM POIRoute")
List<RouteWithWaypoints> getRoutes();
inside the POIWaypoint class (maybe as extra attribute), or at least accessible from another class which maybe is implemented like so:
#Embedded
POIWaypoint waypoint;
int indexOfRoute;
Currently I don't get the indexOfRoute attribute from the junction table.
My already created classes:
RouteWithWaypoints:
public class RouteWithWaypoints {
#Embedded
private POIRoute poiRoute;
#Relation(parentColumn = "id",entityColumn = "id",associateBy = #Junction(value = RouteWaypoint.class, parentColumn = "routeId", entityColumn = "waypointId"))
private List<POIWaypoint> waypoints;
public POIRoute getPoiRoute() {
return poiRoute;
}
public void setPoiRoute(POIRoute poiRoute) {
this.poiRoute = poiRoute;
}
public List<POIWaypoint> getWaypoints() {
return waypoints;
}
public void setWaypoints(List<POIWaypoint> waypoints) {
this.waypoints = waypoints;
}
RouteWaypoint:
#Entity(primaryKeys = {"waypointId", "routeId"}, foreignKeys = {
#ForeignKey(entity = POIWaypoint.class, parentColumns = {"id"}, childColumns = {"waypointId"}),
#ForeignKey(entity = POIRoute.class, parentColumns = {"id"}, childColumns = {"routeId"})
})
public class RouteWaypoint {
private int waypointId;
private int routeId;
// I want this attribute inside the POIWaypoint class
#ColumnInfo(name = "index_of_route")
private int indexOfRoute;
public int getWaypointId() {
return waypointId;
}
public void setWaypointId(int waypointId) {
this.waypointId = waypointId;
}
public int getRouteId() {
return routeId;
}
public void setRouteId(int routeId) {
this.routeId = routeId;
}
}
POIRoute:
#Entity
public class POIRoute{
private String name;
private String description;
#PrimaryKey(autoGenerate = true)
private int id;
private boolean user_generated;
private int parentId;
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 int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public boolean isUser_generated() {
return user_generated;
}
public void setUser_generated(boolean user_generated) {
this.user_generated = user_generated;
}
public int getParentId() {
return parentId;
}
public void setParentId(int parentId) {
this.parentId = parentId;
}
}
POIWaypoint (please ignore the position attribute it isn't finished):
#Entity
public class POIWaypoint {
#PrimaryKey(autoGenerate = true)
private long id;
#ColumnInfo(name = "long_description")
private String longDescription;
private String title;
#ColumnInfo(name = "short_description")
private String shortDescription;
// use converter: https://developer.android.com/training/data-storage/room/referencing-data
#Ignore
private GeoPoint position;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public GeoPoint getPosition() {
return position;
}
public void setPosition(GeoPoint position) {
this.position = position;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getShortDescription() {
return shortDescription;
}
public void setShortDescription(String shortDescription) {
this.shortDescription = shortDescription;
}
public String getLongDescription() {
return longDescription;
}
public void setLongDescription(String longDescription) {
this.longDescription = longDescription;
}

I solved my problem by manage the relation by myself. I changed my RouteDao to an abstract class to insert my own method, which manages part of the junction table by itself:
RouteDao:
private RouteDatabase database;
public RouteDao(RouteDatabase database) {
this.database = database;
}
#Query("Select * from POIRoute")
public abstract List<POIRoute> getRoutes();
#Query("SELECT * FROM POIRoute WHERE id = :id")
public abstract POIRoute getRoute(int id);
#Insert
abstract void insertRouteWithWaypoints(RouteWithWaypoints routeWithWaypoints);
public List<RouteWithWaypoints> getRoutesWithWaypoints() {
List<POIRoute> routes = this.getRoutes();
List<RouteWithWaypoints> routesWithWaypoints = new LinkedList<>();
for (POIRoute r : routes) {
routesWithWaypoints.add(new RouteWithWaypoints(r, database.wayPointDao().getWaypointsFromRoute(r.getId())));
}
return routesWithWaypoints;
}
public RouteWithWaypoints getRouteWithWaypoints(int id) {
POIRoute route = this.getRoute(id);
RouteWithWaypoints routeWithWaypoints = null;
if (route != null) {
routeWithWaypoints = new RouteWithWaypoints(route, database.wayPointDao().getWaypointsFromRoute(route.getId()));
}
return routeWithWaypoints;
}
WayPointDao:
#Query("SELECT * FROM POIWaypoint")
POIWaypoint getWaypoints();
#Query("SELECT * FROM POIWaypoint WHERE id = :id")
POIWaypoint getWaypoint(long id);
#Query("SELECT pw.*, rw.index_of_route as 'index' FROM POIWaypoint as pw Join RouteWaypoint as rw on (rw.waypointId = pw.id) where rw.routeId = :id order by 'index' ASC")
List<POIRouteStep> getWaypointsFromRoute(int id);

getter setter in inner private class in java [closed]

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Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 4 years ago.
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I want to create bean in java corresponding to below json
{
"name": "",
"id": "",
"dept": {
"deptId": "",
"deptName": "",
"course": {
"courseId": "",
}
}
}
My idea is to create parent class and keep dept and course as inner private classes and then have getters setters to get or set data and form parent bean. But I am getting error "Change visibility to the public"
How can I access private fields of inner private class to get and set data?

try this way its will work
public class firstClass{
private String name;
private String id;
Department dept;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Department getDept() {
return dept;
}
public void setDept(Department dept) {
this.dept = dept;
}
}
class Department{
private int departId;
private String deptName;
Course course;
public int getDepartId() {
return departId;
}
public void setDepartId(int departId) {
this.departId = departId;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
public Course getCourse() {
return course;
}
public void setCourse(Course course) {
this.course = course;
}
}
class Course{
private int courseId;
public int getCourseId() {
return courseId;
}
public void setCourseId(int courseId) {
this.courseId = courseId;
}
}

You can't access private fields. Why don't you create a getter and setter for the inner class private fields?
And, maybe you should consider using gson library.

You at least have to make say nested public interfaces, say Dept and Course, with your private (static) nested private classes DeptImpl and SourceImpl.
public class X {
public interface Dept { ... }
private static class DeptImpl extends Dept { ... }
public Dept getDept() { ... }
public Dept createDept(...) {
DeptImpl dept = new DeptImpl(...); ...
return dept;
}
Maybe you need to provide a factory method createDept.
In some cases the implementing class can be anonymous new Dept() { ... }.

You can use Builder Design pattern with immutable Objects:
public class Class {
private final String name;
private final int id;
private final Department dept;
private Class(ClassBuilder classBuilder){
this.name = classBuilder.getName();
this.id = classBuilder.getId();
this.dept = classBuilder.getDept();
}
public String getName() {
return name;
}
public int getId() {
return id;
}
public Department getDept() {
return dept;
}
private static class Department{
private final int deptId;
private final String deptName;
private final Course course;
private Department(DepartmentBuilder departmentBuilder){
this.deptId = departmentBuilder.getDeptId();
this.deptName = departmentBuilder.getDeptName();
this.course = departmentBuilder.getCourse();
}
public int getDeptId() {
return deptId;
}
public String getDeptName() {
return deptName;
}
public Course getCourse() {
return course;
}
private static class Course{
private final int courseId;
private Course(CourseBuilder courseBuilder){
this.courseId = courseBuilder.getCourseId();
}
public int getCourseId() {
return courseId;
}
}
}
public static class ClassBuilder{
private final String name;
private final int id;
private final Department dept;
public ClassBuilder(String name, int id, Department dept){
this.name = name;
this.id = id;
this.dept = dept;
}
public Department getDept() {
return dept;
}
public String getName() {
return name;
}
public int getId() {
return id;
}
public Class build(){
return new Class(this);
}
}
public static class DepartmentBuilder {
private final int deptId;
private final String deptName;
private final Department.Course course;
public DepartmentBuilder(int deptId, String deptName, Department.Course course ){
this.deptId = deptId;
this.deptName = deptName;
this.course = course;
}
public int getDeptId() {
return deptId;
}
public String getDeptName() {
return deptName;
}
public Department.Course getCourse() {
return course;
}
public Department build(){
return new Department(this);
}
}
public static class CourseBuilder{
private final int courseId ;
public CourseBuilder(int courseId){
this.courseId = courseId;
}
public int getCourseId() {
return courseId;
}
public Department.Course build(){
return new Department.Course(this);
}
}
}
public class Sample {
public static void main(String ... strings){
Class clazz = new Class.ClassBuilder("ClassName", 1, new Class.DepartmentBuilder(1, "departmentName", new Class.CourseBuilder(2).build()).build()).build();
System.out.println(clazz.getDept());
}
}

Spring boot+jersey api+ JPA : failed to lazily initialize a collection of role

I am new with using spring boot + jersey api + JPA.
I hava three entity that uses one to many bidirectional mapping. When i used spring boot + jersey api+ JPA I get error :
failed to lazily initialize a collection of role: com.kavinaam.GSTbilling.entity.Country.states, could not initialize proxy - no Session (through reference chain: java.util.ArrayList[0]->com.kavinaam.GSTbilling.entity.City["states"]->com.kavinaam.GSTbilling.entity.States["countyId"]->com.kavinaam.GSTbilling.entity.Country["states"])
I have added my entity, dao , services and end point.
#Entity
#Table(name="country")
public class Country implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id")
private int id;
#Column(name="countryName")
private String countryName;
#OneToMany(mappedBy = "countyId",cascade = CascadeType.ALL)
private Set<States> states;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCountryName() {
return countryName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
public Set<States> getStates() {
return states;
}
public void setStates(Set<States> states) {
this.states = states;
}
}
My state class:
#Entity
#Table(name="states")
public class States implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id")
private int id;
#ManyToOne
#JoinColumn(name="countyId")
private Country countyId;
#Column(name="stateName")
private String stateName;
#OneToMany(mappedBy = "states", cascade = CascadeType.ALL)
private Set<City> city;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Country getCountyId() {
return countyId;
}
public void setCountyId(Country countyId) {
this.countyId = countyId;
}
public String getStateName() {
return stateName;
}
public void setStateName(String stateName) {
this.stateName = stateName;
}
public Set<City> getCity() {
return city;
}
public void setCity(Set<City> city) {
this.city = city;
}
}
My city class:
#Entity
#Table(name="cities")
public class City implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id")
private int id;
#ManyToOne
#JoinColumn(name="stateId")
private States states;
#Column(name="cityName")
private String cityName;
#Column(name="zip")
private String zip;
public void setId(int id) {
this.id = id;
}
public void setZip(String zip) {
this.zip = zip;
}
public States getStates() {
return states;
}
public void setStates(States states) {
this.states = states;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
public String getZip() {
return zip;
}
public int getId() {
return id;
}
}
My DAO:
#Transactional
#Repository
public class GSTCityDAO implements IGSTCityDAO {
#PersistenceContext
private EntityManager entityManager;
//#SuppressWarnings("unchecked")
#Override
public List<City> getAllCities() {
//Session session = sessionFactory.getCurrentSession();
String hql = "FROM City as ct ORDER BY ct.id";
List<City> l = entityManager.createQuery(hql,City.class).getResultList();
return l;
}
#Override
public City getCityById(int cityId) {
return entityManager.find(City.class, cityId);
}
#SuppressWarnings("unchecked")
#Override
public List<City> getCityByStateId(States stateId) {
String getcitybystate = " FROM City as c WHERE c.states = ?";
return (List<City>) entityManager.createQuery(getcitybystate).setParameter(1, stateId).getResultList();
}
#Override
public void addCity(City city) {
entityManager.persist(city);
}
#Override
public void updateCity(City city) {
City cityctl = getCityById(city.getId());
cityctl.setCityName(city.getCityName());
cityctl.setZip(city.getZip());
cityctl.setStates(city.getStates());
entityManager.flush();
}
#Override
public void deleteCity(int cityId) {
entityManager.remove(getCityById(cityId));
}
#Override
public boolean cityExists(String name, String zip) {
String hql = "FROM City WHERE cityName = ? and zip = ?";
int count = entityManager.createQuery(hql).setParameter(1,name).setParameter(2, zip).getResultList().size();
return count > 0 ? true : false;
}
}
Services:
#Service
public class GSTCityService implements IGSTCityService {
#Autowired
private IGSTCityDAO cityDAO;
#Override
public List<City> getAllCities() {
List<City> l = cityDAO.getAllCities();
Hibernate.initialize(l);
return l;
}
public List<City> getCityByStateId(States stateId) {
return cityDAO.getCityByStateId(stateId);
}
#Override
public City getCityById(int cityId) {
City city = cityDAO.getCityById(cityId);
return city;
}
#Override
public synchronized boolean addCity(City city) {
if(cityDAO.cityExists(city.getCityName(), city.getZip())){
return false;
}else{
cityDAO.addCity(city);
return true;
}
}
#Override
public void updateCity(City city) {
cityDAO.updateCity(city);
}
#Override
public void deleteCity(int cityId) {
cityDAO.deleteCity(cityId);
}
}
End Point:
#Component
#Path("/")
public class Test {
private static final Logger logger = LoggerFactory.getLogger(Test.class);
#Autowired
private IGSTCityService cityService;
#GET
#Path("/hi")
#Produces(MediaType.APPLICATION_JSON)
public Response hello(){
return Response.ok("Hello GST").build();
}
#GET
#Path("/test")
#Produces(MediaType.APPLICATION_JSON)
public Response getAllDate(){
List<City> list = cityService.getAllCities();
for(City city: list){
System.out.println(city);
}
return Response.ok(list).build();
}
#GET
#Path("/test/{id}")
#Produces(MediaType.APPLICATION_JSON)
public Response getAllDateBySome(#PathParam("id") Integer id){
States state = new States();
state.setId(id);
List<City> list = cityService.getCityByStateId(state);
return Response.ok(list).build();
}
#GET
#Path("/{id}")
#Produces(MediaType.APPLICATION_JSON)
public Response getDataById(#PathParam("id")Integer id){
City citl = cityService.getCityById(id);
return Response.ok(citl).build();
}
#POST
#Path("/add")
#Consumes(MediaType.APPLICATION_JSON)
public Response addData(City city){
boolean isAdded = cityService.addCity(city);
if(!isAdded){
return Response.status(Status.CONFLICT).build();
}
return Response.created(URI.create("/gst/"+ city.getId())).build();
}
#PUT
#Path("/update")
#Produces(MediaType.APPLICATION_JSON)
#Consumes(MediaType.APPLICATION_JSON)
public Response updateCountry(City city){
cityService.updateCity(city);
return Response.ok(city).build();
}
#DELETE
#Path("/{id}")
#Consumes(MediaType.APPLICATION_JSON)
public Response deleteCountry(#PathParam("id")Integer id){
cityService.deleteCity(id);
return Response.noContent().build();
}
}
I am using import org.springframework.transaction.annotation.Transactional; for transnational in DAO. Also I can not use #PersistenceContext(type=PersistenceContextType.EXTENDED) and fetch type Eager because I get error of Maximum stack size exceeded

I solved it by using the #JsonBackReference on OneToMany relationship. The problem is with the Serialization and Deserialization.
" the property annotated with #JsonManagedReference annotation is handled normally (serialized normally, no special handling for deserialization) and the property annotated with #JsonBackReference annotation is not serialized; and during deserialization, its value is set to instance that has the "managed" (forward) link."

You should do one or both of the following:
1) Move the #Transactional from DAO to Service. Thats a good idea in general as usually are still processing the result entities in some way on that layer.
2) Fetch the dependencies in the queries explicitly:
select ct FROM City as ct inner join fetch ct.states s ORDER BY ct.id

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