I can't get an entity ID in spring boot - spring

Question

I am learning Spring-Boot and I'm doing a little project to practice, but I have a problem.
This is a simple authentication app, you can register and log in. My aim is: If you log in your username should be appeared, and for further functions I need the ID as well.
So I have this code:
#PostMapping("/main")
public String login(#ModelAttribute Users user, Model model) {
time = sdf.format(new Date());
Users correctUser = serv.selectUser(user.getName(), user.getPassword());
if (correctUser != null) {
//Users data
login_name = user.getName();
actual_user_id = user.getId();
model.addAttribute("given_name", login_name);
System.out.println("DEBUG: " + user);
System.out.println(time + " Successful");
return "main_screen";
} else {
System.out.println(time + " Log in failed");
return "error_page";
}
}
I can get and storage the name well in login_name, but with the ID I have some problems. As you can see I use user.getId() same as with name, but either way I get null and can't storage the ID in my actual_user_id variable.
Here is my repository:
#Repository
public interface UserRepository extends JpaRepository<Users, Integer> {
Optional<Users> findFirstByName(String name);
Optional<Users> findUserByNameAndPassword(String name, String password);
}
And my service method:
public Users authentication(String name, String password) {
return repo.findUserByNameAndPassword(name, password).orElse(null);
}
EDIT: And this is my Users class
#Entity
#Table(name = "users")
public class Users {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
private String password;
private String email;
public Integer getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
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;
}
#Override
public String toString() {
return "Users{" +
"id=" + id +
", name='" + name + '\'' +
", passowrd='" + password + '\'' +
", email='" + email + '\'' +
'}';
}
}
I think it should work, but I can't find the problem.
Can anyone help me?
As I can see, I get the name and the password with the findUserByNameAndPassword() and nothing else, however I should I suppose.

Answer 1

You look to be trying to get your id from the user passed to you in the post request:
actual_user_id = user.getId();
Try getting your information from the user you retrieved from the database:
actual_user_id = correctUser.getId();