hibernate multiplebagfetchexception code example

Example: multibag fetch exception

List<Post> posts = entityManager.createQuery("""
    select distinct p
    from Post p
    left join fetch p.comments
    where p.id between :minId and :maxId""", Post.class)
.setParameter("minId", 1L)
.setParameter("maxId", 50L)
.setHint(QueryHints.PASS_DISTINCT_THROUGH, false)
.getResultList();
 
posts = entityManager.createQuery("""
    select distinct p
    from Post p
    left join fetch p.tags t
    where p in :posts""", Post.class)
.setParameter("posts", posts)
.setHint(QueryHints.PASS_DISTINCT_THROUGH, false)
.getResultList();
 
assertEquals(POST_COUNT, posts.size());
 
for(Post post : posts) {
    assertEquals(POST_COMMENT_COUNT, post.getComments().size());
    assertEquals(TAG_COUNT, post.getTags().size());
}