I have created the following entities.
@Entity
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
@OneToMany(mappedBy = "student")
private List<Book> books;
}
@Entity
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
@ManyToOne
@JoinColumn(name = "STUDENT_ID")
private Student student;
}
My controller looks like this
@RestController
public class Controller {
MyService myService;
public Controller(MyService myService) {
this.myService = myService;
}
@GetMapping("student")
public List<Book> getBooksForStudent(Long id) {
return myService.getBooks(id);
}
}
The service is as follows.
public class MyService {
@Autowired
private StudentRepo studentRepo;
public List<Book> getStudent(Long id) {
Optional<Student> studentOptional = studentRepo.findById(id);
return studentOptional.map(Student::getBooks).orElseThrow(IllegalArgumentException::new);
}
}
I am getting the list of books as expected. But as I'm having lazy loaded list for books I should be getting a LazyInitializationException. I have not added transnational to the method and I'm returning the list of books from the entity itself without mapping it to a DTO. Why is the hibernate session not getting closed after the end of the method?
