@Test
public void simpleReproducer() {
	Post post = new Post();
	post.setName( "This is a post" );

	EntityTransaction trx = entityManager.getTransaction();
	trx.begin();

	post = entityManager.merge( post );
	Long postId = post.getId();
	assertNotNull( postId );

	entityManager.flush();
	entityManager.clear();
	entityManagerFactory.getCache().evictAll();

	trx.commit();

	trx.begin();

	Post reloaded = entityManager.find( Post.class, postId );
	Comment comment = new Comment();
	comment.setName( "This is a comment" );
	comment.setPost( reloaded );
	reloaded.getComments().add( comment );

	entityManager.flush();
	entityManager.clear();
	entityManagerFactory.getCache().evictAll();

	trx.commit();
}