👀 Views: 417 💬 Answers: 1 📅 Created: 2025-06-09

java hibernate jpa Java

I'm working with an scenario with JPA Entity Graphs while using Hibernate with Java 17. I have an entity `User` that has a one-to-many relationship with `Post`. I want to fetch a `User` along with its associated `Post` entities. However, even after defining an `EntityGraph`, the associated `Post` entities are not being fetched as expected. Here's how I've set it up: ```java @Entity @NamedEntityGraph(name = "User.posts", attributePaths = {"posts"}) public class User { @Id private Long id; private String name; @OneToMany(mappedBy = "user", fetch = FetchType.LAZY) private List<Post> posts; } @Entity public class Post { @Id private Long id; private String content; @ManyToOne @JoinColumn(name = "user_id") private User user; } ``` And when I try to fetch the user with its posts, I use this code: ```java EntityGraph entityGraph = entityManager.getEntityGraph("User.posts"); Map<String, Object> properties = new HashMap<>(); properties.put("javax.persistence.fetchgraph", entityGraph); User user = entityManager.find(User.class, userId, properties); ``` However, the `posts` collection remains empty. I also verified that the user has posts in the database, but they are just not being loaded. I get no errors or exceptions, but the output shows `posts.size() = 0`. I've also tried changing the fetch type to `EAGER`, but that resulted in a `N+1` question which severely impacted performance. Any insights or suggestions on what might be going wrong? I’m using Hibernate 5.6.9.Final and JPA 2.2. Thanks!