How to handle inheritance in Java Spring boot (Gradle)

Question

Well I'm quite new to this area and trying to understand the concepts of inheritance relationship mapping in hibernate .

The scenario I'm facing is to build a recruitment web app which have different users , such as:

1. ForeignCompany
2. LocalCompany
3. JobSeeker

Thereby user class will be the super-class and I will be using @MappedSuperclass for mapping the relationships of inheritance.

I have done the mapping and now where I'm stuck with is how to make repositories and make calls such as :

i. RegisterUser() : because the User class is super class it cant be instantiated , the biggest issue I'm facing is that I'm doing it right or what would be the best practice to follow ? maybe the issue is I'm new and doesn't get it . Your help would mean a lot thanks .

The code :

@Data
@NoArgsConstructor
@AllArgsConstructor
@MappedSuperclass
public class User {

    // Defining member fields
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long userId;

    @Enumerated(EnumType.STRING)
    private Role role;
    private Date userDob;
    private String userAddress;
    private String username;
    private String userMail;
    private String userPassword;


}

@Data
@Entity
@EqualsAndHashCode(callSuper=false)
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class ForeignCompany extends User{

    //Defining member fields
    private String companyName;


}

Service class :

Is this the right way to save the password ?

@Service public class UserServiceImpl implements UserService{

//Create member functions

@Override
public User saveUser(User user){
   user.setUserPassword(passwordEncoder.encode(user.getUserPassword()));
    return userRepository.save(user);
}

service interface:

public interface UserService {
    User saveUser(User user);
}