Java Spring Boot REST API scenarios with 500 Internal Server scenarios due to Hibernate lazy loading guide
I'm trying to implement I tried several approaches but none seem to work. I'm currently developing a REST API using Spring Boot (version 2.5.4) and Hibernate (version 5.5.3). I've encountered a frustrating scenario where I receive a 500 Internal Server behavior when trying to access an endpoint that fetches a list of users along with their associated roles. The behavior seems to be related to Hibernate's lazy loading feature. The stack trace indicates a `LazyInitializationException` when it tries to access the roles outside of the session context. Here's the relevant part of my code: ```java @Entity public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String username; @OneToMany(mappedBy = "user", fetch = FetchType.LAZY) private List<Role> roles; } @Entity public class Role { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String roleName; @ManyToOne @JoinColumn(name = "user_id") private User user; } @RestController @RequestMapping("/api/users") public class UserController { @Autowired private UserRepository userRepository; @GetMapping public List<User> getAllUsers() { return userRepository.findAll(); // This line triggers LazyInitializationException } } ``` I’ve tried changing the fetch type to `FetchType.EAGER` for the roles in the `User` entity, but I don't want to load all roles every time I fetch users, as that could severely impact performance. I’ve also attempted using `@Transactional` on the `getAllUsers` method, but the scenario continues. What is the best way to handle this situation without compromising performance? Can anyone suggest an alternative pattern or solution that would allow me to fetch users with their roles while avoiding `LazyInitializationException`? Thanks in advance! Thanks in advance! This is part of a larger REST API I'm building. What are your experiences with this? I recently upgraded to Java latest. I'd love to hear your thoughts on this.