Hibernate updates a different object with the same Identifier value was already associated with the session

I have never found a good solution. I believe everyone knows the cause of this error because two identical identifiers but different entities exist in the same session in hibernate.
Start with the online session. merge (object) reported an error, which may be useless. Use session instead. clear (); Session. update (resume); then OK,
Method:

// Update public void Update (resume) {try {session = gethibernatetemplate (). getsessionfactory (). getcurrentsession (); Session. clear (); Session. update (resume);} catch (exception e) {logger. error (E); throw new baseappruntimeexception (e );}}

...
The project uses spring + hibernate, so gethibernatetemplate (). getsessionfactory (). getcurrentsession (); gets the current session