[solved] org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session:

Meaning of this exception:

If we are trying to save the same identifier (primary key) with different session we will get this error.

How I solved ?

I have used Transaction and session previosly, then I replaced those things with getHibernateTemplate,
getHibernateTemplate().saveOrUpdate(myBean);

Then issue got resolved.

In another scenario,getHibernateTemplate().saveOrUpdate(myBean); for the same I got the same exception that is because I assigned null to myBean after save or update so if same identifier comes it producing the issue.

So I changed

getHibernateTemplate().saveOrUpdate(myBean);
myBean = null

to

getHibernateTemplate().saveOrUpdate(myBean);
//myBean = null

If the above ways did not work for you then try this too,

getHibernateTemplate().merge(myBean);

In case if you are facing the same error with spring data jpa:

Solution 1 with Spring Data JPA:

Make the exact save logic method in other words, where exactly your repository .save method is called that wrapper method you need to keep as public & with @Transactional annotation.

Solution 2 with Spring Data JPA:

@PersistenceContext
private EntityManager entityManager;

and clear the session with .flush method just after your save()

entityManager.flush();

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