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  1. Comment class

    @ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "user_id")
private User user;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "image_id")
private Image image;

  2. User class

    @OneToMany(mappedBy = "user", cascade = CascadeType.MERGE, fetch = 
FetchType.EAGER)
private List<Comment> comments = new ArrayList<>();

  3. Image class

    @OneToMany(mappedBy = "image",cascade = CascadeType.MERGE,fetch = 
FetchType.EAGER)
private List<Comment> comments = new ArrayList<Comment>();

  4. These are the ManyToOne and OneToMany relations I have. I am unable to persist the Comment object due to "detached entity passed to persist: ImageHoster.model.Comment" error.

Siva
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    Possible duplicate of [JPA/Hibernate: detached entity passed to persist](https://stackoverflow.com/questions/13370221/jpa-hibernate-detached-entity-passed-to-persist) – crizzis Jul 12 '19 at 19:11
  • I have tried the changes suggested in the previous post but no luck! – Siva Jul 12 '19 at 19:14

1 Answers1

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  1. I kind of figured out the issue. In the CommentRepository class where I am persisting the Comment object, I used .merge instead of .persist

    EntityManager em = emf.createEntityManager(); EntityTransaction transaction = em.getTransaction(); try{ transaction.begin(); em.merge(newComment);

  2. instead of em.persist(newComment);

Siva
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