JPA thinks I'm deleting a detached object

Question

I\'ve got a DAO that I used to load and save my domain objects using JPA. I finally managed to get the transaction stuff working, now I\'ve got another issue.

In my

Answer 1

Transaction ensures the ACID properties but not whether the entity is attached or detached. Even if you are running entityManager.find and entityManager.remove() in the same transaction , there is not guarantee that the entity will be attached. So before issuing entityManager.remove() check if the entity is attached, if not attach it using enitityManger.merge(entity) and then issue entityManager.remove on it as follows:

@Transactional
 public void delete (long id)
    {
ModelObj modelObj=entityManager.find(ModelObj.class,id);
modelObj=entityManager.contains(modelObj)?modelObj:entityManager.merge(modelObj);
        em.remove (modelObj);
    }