Step 1 In one thread, i fetched Employee for id 1 from DB in hibernate session and close the session
Step 2 I started session 2, Upadted the employee name for id 1.
Step 3 Now back in thread 1, i changed the employee name in detached instance.Then open the hibernate session and updated the emp in db
I was expectind concurrent update exception because in between version has been updated by thread 2. Why it is not thrown? I think i am missing some concept here but not sure what?
Here is the relevant code :-
Thread 1
Step 1
Employee Employee1=(Employee)session.get(Employee.class, 1);
session.close();
Step 2
// Start new Thread i.e Thread 2 and update Employee in between
Makes sure thread 2 is done before proceeding to step3
Step 3
Employee.setName("EmployeeUpdated");
session = factory.openSession();
tx = session.beginTransaction();
session.update(Employee);
tx.commit();// expect the concurrent update here
session.close();
Thread 2
Thread(SessionFactory factory){
this.factory = factory; // same factory as used in Thread1
}
public void run() {
Session session = factory.openSession();
Transaction tx = session.beginTransaction();
Employee Employee1=(Employee)session.get(Employee.class, 1);
tx.commit();
session.close();
session = factory.openSession();
tx = session.beginTransaction();
Employee1.setName("EmployeeUpdatedByThread2");
session.merge(Employee1);
tx.commit();
session.close();
}
Do hibernate need explict configuration to check version while update?
