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How to create a JPA entity which has a field(s) from another entity?

I have the following entity in SpringBoot and I would like to create a new entity which has the userID of the registered user and the name of the registered/logged in user as instance fields/table columns.
#Data
#AllArgsConstructor
#NoArgsConstructor
#Entity
#Table(name="User")
public class WebUser {
#Id
#GeneratedValue
private Long userID;
#NonNull
private String name;
#NonNull
private String email;
#NonNull
private String password;
}
How would I go about doing this using a form in SpringBoot and JPA entity? I am struggling, I tried to create a form with hidden input fields using #OneToMany annotation but the userID and name were null.
Thanks for any help

Frist of all you Should define table column names using #Column(name = "COLUMN_NAME") and assume your new entity name LogUser.
LogUser
#Data
#AllArgsConstructor
#NoArgsConstructor
#Entity
#Table(name="LogUser")
public class LogUser{
#Id
#GeneratedValue
#Column(name = "ID")
private Long id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "USER_ID", nullable = false)
private WebUser webUser;
#Column(name = "NAME", nullable = false)
private String name;
}
WebUser
#Data
#AllArgsConstructor
#NoArgsConstructor
#Entity
#Table(name="User")
public class WebUser {
#Id
#GeneratedValue
#Column(name = "USER_ID")
private Long userID;
#Column(name = "NAME", nullable = false)
private String name;
#Column(name = "EMAIL", nullable = false)
private String email;
#Column(name = "PASSWORD", nullable = false)
private String password;
#OneToMany(mappedBy = "webUser")
private Set<LogUser> logUsers;
}

Null point exception on set spring JPA relationship

I have already seen topics with this question, but they did not help me. Maybe I didn't see something.
Below I attach the code and the error.
#Entity
#Table(name = "department")
#Data
#NoArgsConstructor
#AllArgsConstructor
#Builder
#EqualsAndHashCode
public class Department {
#Id
#GenericGenerator(name = "uuid2", strategy = "uuid2")
#GeneratedValue(strategy = GenerationType.IDENTITY, generator = "uuid2")
#Column(length = 36, nullable = false, updatable = false)
private UUID id;
#Column(name = "name", nullable = false)
private String name;
#Column(name = "description", nullable = false)
private String description;
#OneToMany(mappedBy = "department", cascade = CascadeType.ALL, fetch = FetchType.LAZY,
orphanRemoval = true)
private Set<User> userSet = new HashSet<>();
}
AND user
#Entity
#Table(name = "user")
#Data
#NoArgsConstructor
#AllArgsConstructor
#Builder
#EqualsAndHashCode
public class User {
#Id
#GenericGenerator(name = "uuid2", strategy = "uuid2")
#GeneratedValue(strategy = GenerationType.IDENTITY, generator = "uuid2")
#Column(length = 36, nullable = false, updatable = false)
private UUID id;
private String firstName;
private String lastName;
private Integer age;
#ManyToOne
#JoinColumn(name = "dep_id", nullable = true)
private Department department;
#ManyToMany
#JoinTable(
name = "device_devices",
joinColumns = #JoinColumn(name = "user_id"),
inverseJoinColumns = #JoinColumn(name = "device_id"))
Set<Device> devices = new HashSet<>();
}
and service
#Override
public List<DepartmentDto> getAllDepartment() {
List<Department> all = departmentRepository.findAll();
return all.stream().map(mapper::toDepartmentDto).collect(Collectors.toList());
}
#Override
public UUID createDepartment(DepartmentDto departmentDto) {
Department entity = mapper.DtoToDepartment(departmentDto);
return departmentRepository.save(entity).getId();
}
#Override
public void deleteDepartment(UUID id) {
departmentRepository.deleteById(id);
}
#Override
#Transactional
public void addUserToDepartment(UUID departmentId,UUID userId){
Department department = departmentRepository.findById(departmentId).orElseThrow(DepartmentNotFoundException::new);
User user = userRepository.findById(userId).orElseThrow(UserNotFoundException::new);
department.getUserSet().add(user); // ERROR java.lang.NullPointerException: null
user.setDepartment(department);
}
I think I did something wrong. I tried writing Cascade.ALL but it didn't help me. I don't think I fully understand the concept of a link collection yet. I don't like that in my code, I add the user to the department, and then I add the department to the user. Probably it can be done in one action.
Task.
I want to make a department and 2 functions. Add a user to the department and remove users from the department. in such a way that the contempt of the users from the department the user himself was not removed.
I will be glad to hear your comments

if you use #Builder annotation on top of the class
and you want to set default value for a field,
you must put annotation #Builder.Default on top of field
#Builder.Default
Set<Device> devices = new HashSet<>();
otherwise devices will always be NULL when the builder builds the object

role based creation of users in Spring boot

i have Three entities User, Institution and Role.
1)one to many between user and institution
2)and many to many between User and Role
-------user-------
#Entity
#Table(name = "user")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="user_Id")
private int userId;
#Column(name="name")
private String name;
#Column(name="lastname")
private String lastname;
#Column(name="email")
private String email;
#Column(name="password")
private String password;
#Column(name="isActive")
private boolean isActive;
#Column(name="lastActive")
private String lastActive;
#Column(name="createdDate")
private String createdDate;
#Column(name="isBlocked")
private boolean isBlocked;
#ManyToOne(fetch = FetchType.LAZY, optional = false)
#JoinColumn(name = "institution_id", nullable = false)
#JsonIgnoreProperties(value = {"user"})
private Institution institution;
#ManyToMany(fetch = FetchType.LAZY)
#JoinTable(name = "user_has_role",
joinColumns = {
#JoinColumn(name = "user_id", referencedColumnName = "user_id",
nullable = false, updatable = true)},
inverseJoinColumns = {
#JoinColumn(name = "role_id", referencedColumnName = "role_id",
nullable = false, updatable = true)})
#JsonIgnoreProperties(value = {"users"})
private Set<Role> roles = new HashSet<>();
}
-------institution-------
#Getter
#Setter
#NoArgsConstructor
#AllArgsConstructor
#ToString
#Entity
#Table(name = "institution")
public class Institution {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="institution_Id")
private int institutionId;
#Column(name="name")
private String name;
#Column(name="type")
private String type;
#Column(name="location")
private String location;
#OneToMany(mappedBy = "institution", fetch = FetchType.LAZY)
#JsonIgnoreProperties(value = {"institution" , "user"})
private Set<User> user;
}
-------role-------
#Getter
#Setter
#NoArgsConstructor
#AllArgsConstructor
#ToString
#Entity
#Table(name = "role")
public class Role {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="role_Id")
private int roleId;
#Column(name="name")
private String name;
#Column(name="description")
private String description;
#ManyToMany(mappedBy = "roles", fetch = FetchType.LAZY)
#JsonIgnoreProperties(value = {"roles"})
private Set<User> users = new HashSet<>();
}
Those are my 3 entities and tables in MySql
i have 7 roles
• Super-User
• Bank-Admin
• Bank-Support
• Bank-Service
• Merchant-Admin
• Merchant-Support
• Merchant-service
The super-User can create a user of any role
#PostMapping("/addUser")
public String addUser(#RequestBody User user) {
String rawpassword = user.getPassword();
String encodedpasswrod = passwordencoder.encode(rawpassword);
user.setPassword(encodedpasswrod);
userrepository.save(user);
return "user saved with name: " + user.getName();
}
this api works and i can set the role to anything in my api json body
But want that if the User is Bank-Admin he can only create Bank-Support and Bank-Service
im trying to create a new API which can only create a user with those 2 specific roles.
and then restrict the bank admin to access the other API that can create users of any kind.
is there any other way to do it and if no how can i do that...

You have to implement your custom implementation of User Entitlement.
Like according to login person, you will get that login person role, and according to your criteria just put validation like check that entity he is trying to add is he eligible to create it.
Map<String, List<String>> roleUserAccessMap = new HashMap<>();
roleUserAccessMap.put("Bank-Admin", Arrays.asList("Bank-Support", "Bank-Service"));
Just check like below
String loginPersonRole="Bank-Admin"; //This value should get from logged-in person context
if(roleUserAccessMap.containsKey(loginPersonRole) && roleUserAccessMap.get(loginPersonRole).contains(newuserrole) ){
//proceed ahead with Add api
}else{
System.out.println("You do not have enough privileage to create Use");
}
This will help you.

foreign key not getting inserted when hibernate one to one mapping is used

I have two entites as follows
user entity
#Entity
#Table(name = "user")
#Getter
#Setter
public class UserEntity{
#Id
#GeneratedValue(strategy = GeneratedType.IDENTITY)
#Column(name = "user_id")
private Long userId;
#Column(name = "user_name")
private String name;
#OneToOne(Cascade=CascadeType.ALL, mappedBy="user")
private UserAddressEntity addressEntity;
}
user address entity
#Entity
#Table(name = "user_address")
#Getter
#Setter
public class UserAddressEntity{
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "user_id")
private Long userId;
#Column(name = "address")
private String address;
#OneToOne
#JoinColumn(name = "user_id", nullable = false, referencedColumnName = "user_id")
private UserEntity user;
}
I am saving user entity as follows in service class
#Service
public class UserService{
#Autowired
private UserRepository userRepository;
public void saveUser(){
UserEntity userEntity=new UserEntity();
UserAddressEntity userAddressEntity=new UserAddressEntity();
//logic here
userEntity.setAddressEntity(userAddressEntity);
userRepository.save(userEntity);
}
}
After saving entity user_id column is not being saved in user_address table. It's value is saved as null.I can't seem to find where the issue is.
EDIT:
I have added following to entities after answer referred in comments but I am getting this error
Infinite recursion (StackOverflowError)
#Entity
#Table(name = "user")
#Getter
#Setter
public class UserEntity{
#Id
#GeneratedValue(strategy = GeneratedType.IDENTITY)
#Column(name = "user_id")
private Long userId;
#Column(name = "user_name")
private String name;
#OneToOne(Cascade=CascadeType.ALL, mappedBy="user")
private UserAddressEntity addressEntity;
//added this
public void setAddressEntity(UserAddressEntity addressEntity){
if (!addressEntity.equals(this.addressEntity)){
this.addressEntity=addressEntity;
addressEntity.setUser(this);
}
}
#Entity
#Table(name = "user_address")
#Getter
#Setter
public class UserAddressEntity{
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "user_id")
private Long userId;
#Column(name = "address")
private String address;
#OneToOne
#JoinColumn(name = "user_id", nullable = false, referencedColumnName = "user_id")
private UserEntity user;
//added this
public void setUser(UserEntity user){
if (!user.equals(this.user){
this.user=user;
}
}
}

You need to set the relationship correctly in UserService.saveUser():
userEntity.setAddressEntity(userAddressEntity);
userAddressEntity.setUser(userEntity);
Also, use regular getters/setters, no need to add logic there.

The recommended/best way to map a #OneToOne is to use #MapsId. With that approach, you don’t need at all a bidirectional association.
I would advise you to take look at link below, there you have answer to your question with example how to save and map between objects.
https://vladmihalcea.com/the-best-way-to-map-a-onetoone-relationship-with-jpa-and-hibernate/

Can't save entity in hibernate

I have created simple CRUD service. With 4 entities: Customer, Provider, Product, Deal.
Customer and Provider entities has composed id AppId with the following structure:
#Getter
#Setter
#Embeddable
#NoArgsConstructor
public class AppId implements Serializable {
private String app;
private String id;
//...
}
Here is business logic I want:
Providers entity cascades and creates Product entities.
When the customer makes deal with provider I need to create entity Deal, which doesn't cascade any other entities.
It just has fields which refer to provider, customer and product of the deal.
I created some providers and customers.
Then I tried to create deal, but I got fields customer and provider null.
Here are my entities definitions:
Provider:
#Entity
#Getter
#Setter
#ToString
#NoArgsConstructor
#Table(name = "provider")
public class Provider implements Serializable {
#EmbeddedId
#Column(name = "appid")
private AppId appId;
#Column(name = "name")
private String name;
#Column(name = "firstname")
private String firstName;
#Column(name = "lastname")
private String lastName;
#Column(name = "latitude")
private float latitude;
#Column(name = "longitude")
private float longitude;
#Column(name = "work_date")
private Date workDate;
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(name = "provider_product"
, joinColumns = {
#JoinColumn(name = "provider_app"),
#JoinColumn(name = "provider_id")
}
, inverseJoinColumns = #JoinColumn(name="product_id"))
private Set<Product> products;
#OneToMany(cascade = CascadeType.ALL)
#JoinColumns({
#JoinColumn(name = "app", referencedColumnName = "app", updatable = false, insertable = false),
#JoinColumn(name = "id", referencedColumnName = "id", updatable = false, insertable = false)
})
private List<Deal> dealList = new ArrayList<>();
}
Customer:
#Entity
#Getter
#Setter
#ToString
#NoArgsConstructor
#Table(name = "customer")
public class Customer implements Serializable {
#EmbeddedId
#Column(name = "appid")
private AppId appId;
#Column(name = "firstname")
private String firstName;
#Column(name = "lastname")
private String lastName;
public Customer(AppId appId, String firstName, String lastName) {
this.appId = appId;
this.firstName = firstName;
this.lastName = lastName;
}
}
Product:
#Entity
#Getter
#Setter
#ToString
#NoArgsConstructor
#Table(name = "product")
public class Product implements Serializable {
#Id
#GeneratedValue
private long id;
#Column(name = "name")
private String name;
#Column(name = "cost")
private long cost;
}
Deal:
#Entity
#Getter
#Setter
#ToString
#NoArgsConstructor
#Table(name = "deal")
public class Deal implements Serializable {
#Id
#GeneratedValue
private long id;
#ManyToOne
#JoinColumns({
#JoinColumn(name = "provider_app", referencedColumnName = "app", insertable = false, updatable = false),
#JoinColumn(name = "provider_id", referencedColumnName = "id", insertable = false, updatable = false)
})
private Provider provider;
#ManyToOne
#JoinColumns({
#JoinColumn(name = "customer_app", insertable = false, updatable = false),
#JoinColumn(name = "customer_id", insertable = false, updatable = false)
})
private Customer customer;
#ManyToMany
#JoinTable(name = "deal_product"
, joinColumns = #JoinColumn(name="deal_id", insertable = false, updatable = false)
, inverseJoinColumns = #JoinColumn(name="product_id", insertable = false, updatable = false))
private Set<Product> product;
// deal is complete when provider entered deal id
#Column(name = "closed")
private boolean closed = false;
}

By removing insertable = false for customer and provider fields in the Deal entity, everything works fine.
{
"id": 5,
"provider": {
"appId": {
"app": "vk",
"id": "123"
},
"name": null,
"firstName": null,
"lastName": null,
"latitude": 0,
"longitude": 0,
"workDate": null,
"products": null,
"dealList": []
},
"customer": {
"appId": {
"app": "vk",
"id": "123"
},
"firstName": null,
"lastName": null
},
"product": [
{
"id": 2,
"name": "Temp",
"cost": 100
}
],
"closed": false
}
I could get the following response.
insertable = false on a field means when you are saving the entity you won't be saving the value for that field and will set the field explicitly somewhere.
insertable = true doesn't mean you will create a new Customer or Provider, that is handled by CascadeType