Difficulty with Java 17 and Hibernate: LazyInitializationException during Pagination
I'm migrating some code and I've tried everything I can think of but I'm having trouble with I'm working with a `LazyInitializationException` when trying to paginate results in my Java 17 application using Hibernate..... The scenario arises when I attempt to fetch a list of entities associated with a parent entity that I'm loading in a paginated manner. Specifically, I have a `User` entity with a `List<Order>` that is lazily loaded. When I try to access the orders after fetching users in a paginated list, I get the exception. Here’s a snippet of how I’m currently querying the data: ```java // User entity @Entity public class User { @Id private Long id; private String name; @OneToMany(mappedBy = "user", fetch = FetchType.LAZY) private List<Order> orders; } // Order entity @Entity public class Order { @Id private Long id; private String description; @ManyToOne @JoinColumn(name = "user_id") private User user; } // Repository method for pagination public Page<User> findAllUsers(Pageable pageable) { return userRepository.findAll(pageable); } ``` In my service layer, I call `findAllUsers` and then attempt to access the orders for each user in the result set: ```java Page<User> users = userService.findAllUsers(pageRequest); for (User user : users) { System.out.println(user.getOrders().size()); // Throws LazyInitializationException } ``` I’ve tried to eagerly fetch the orders by modifying the `@OneToMany` annotation to use `FetchType.EAGER`, but it leads to performance optimization due to the N+1 selects question with large datasets. I also considered using `JOIN FETCH` in my query, but it complicates the pagination. I’ve checked my transaction boundaries and confirmed that the session is still open when I access the orders, yet the exception continues. How can I effectively handle this situation without incurring performance penalties or running into LazyInitializationExceptions? I'm working on a CLI tool that needs to handle this. I've been using Java for about a year now. Is there a simpler solution I'm overlooking? I appreciate any insights! I'm open to any suggestions.