Question

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Hibernate: different object with the same identifier value was already associated with the session

I tried to save two entity once:

session=....getCurrentSession();

Book bo1=new Book();
bo1.setName("name1");
session.save(bo1);

Book bo2=new Book();
bo2.setName("name2");
session.save(bo2);

Then I get a exception:

a different object with the same identifier value was already associated with the session.

Seems that the bo2′ identifier exist (the bo1’s identifier), I wonder why?

BTW, I really want to know more about the session in hibernate, any docs? I have read the tutorial of hibernate, but it is not detailed enough.

Answer 1

You need to provide Book mapping. I difficult to know what can happen behind the scenes if you just show some snippet of code. We help you if you help us. But a good intro to SessionFactory/Session is shown here. Good lucky!