In Hibernate session, there are two similar objects with the same ID, and the modification fails

If there are two identical IDs of the same type object in Hibernate session, the modification will fail with error: A different object with the same identifier value were already

Solution:

Use merge ()

The following scenario:

User u = dao.getuser (...);

User U2 = ...;

U2.setid (U.getid ()); In this session, there are two objects of the same ID.

Dao.update (U2); There's going to be an error here.

Dao.merge (U2); That's it, okay?

In Hibernate session, there are two similar objects with the same ID, and the modification fails