How to get old entity value in @HandleBeforeSave event to determine if a property is changed or not?

Question

I\'m trying to get the old entity in a @HandleBeforeSave event.

@Component
@RepositoryEventHandler(Customer.class)
public class CustomerEventHan         


        

Answer 1

I had the same problem, but I wanted the old entity available in the save(S entity) method of a REST repository implementation (Spring Data REST). What I did was to load the old entity using a 'clean' entity manager from which I create my QueryDSL query:

    @Override
    @Transactional
    public  S save(S entity) {
        EntityManager cleanEM = entityManager.getEntityManagerFactory().createEntityManager();
        JPAQuery query = new JPAQuery(cleanEM);
//here do what I need with the query which can retrieve all old values
        cleanEM.close();
        return super.save(entity);
    }