Force Hibernate to read database and not return cached entity

Question

I am using Hibernate and Spring for my web application.

In database operation, Hibernate is caching entities and returning them in next request without reading the a

Answer 1

Please call EntityManger.clear() method, and then call repository.find() or repository.findOne() as per your requirement to select the updated data from database.

@PersistentContext EntityManager em;
@Autowired EntityReporisitory rep;
....
....
@Transactional
public void method(){
....
....
em.clear();// This line will clear the current value of entity
Entity e = rep.find(example);// In this line data will be loaded freshly from DB
....
....
}

Answer 2

• Call refresh entity session.refresh(entity)

  or

• Open new session then call session2.get(EntityClass.class,id) it will pull the entity from the database

      Session session2=sessionFactory.openSession();                  
      EntityClass entity=(EntityClass) session2.get(EntityClass.class, id);
  

Answer 3

session.refresh(entity) or entityManager.refresh(entity) (if you use JPA) will give you fresh data from DB.

Answer 4

Do the read within a new transaction.

For example:

...
MyDTO myDTO = fetchMyDTOById(daoId);
...
@Transactional(readOnly = true, propagation = Propagation.REQUIRES_NEW)
private MyDTO fetchMyDTOById(Long dtoId) {
    return repository.findById(dtoId);
}