Spring Data: Override save method

Question

I\'m considering spring data for a project. Is it possible to override the per default generated save method? And if yes, how?

Answer 1

The solution from @ytterrr works but for older Spring Data versions, for Spring Data 2.1 at least, this is the way to not just override any repository method but also access to the underlying features (access to the entity manager to persist, delete, find...):

public interface MyEntityRepositoryCustom {
   S save(S entity);
}

public class MyEntityRepositoryImpl implements MyEntityRepositoryCustom {

    final JpaEntityInformation entityInformation;
    EntityManager em;

    public MyEntityRepositoryImpl(EntityManager entityManager) {
        this.entityInformation = JpaEntityInformationSupport.getEntityInformation(MyEntity.class, entityManager);
        this.em = entityManager;
    }

    /**
     * @see org.springframework.data.jpa.repository.support.SimpleJpaRepository
     */
    @Transactional
    public  S save(S entity) {

        // do your logic here

        if (entityInformation.isNew(entity)) {
            em.persist(entity);
            return entity;
        } else {
            return em.merge(entity);
        }
    }
}