Hello folks, I have the follow objects:

class Contry {
...
}

class Address {
private Country country;

@OneToOne(cascade = CascadeType.ALL)
public Country getCountry() {
return country;
}

public void setCountry(Country country) {
this.country = country;
}
}

So, I run some processes that put some information in the data base, let's say
Country country = new Country("Japan");
session.save(country);
t.commit();

after that I want to put some addresses in the data base
Address address = new Address();
* Here is the thing, I don't wanna replicate the country object
Country country = getCountryFromDataBase("Japan");
address.setCountry(country)
session.save(address)
t.commit();

I received this error:

a different object with the same identifier value was already associated with the session: [Country#3]

Any clue?

try session.flush() or session.evict(object)

Thanks for reply me, I could solve the problem, I closed all my sessions after I use it. But even then, I still got some errors, something like "the session is closed or terminated", I got this error because I was manipulating objects in lazy mode (I din't even know that I was in lazy mode). I modified my @OneToMany(cascade = CascadeType.ALL) annotation to @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER). About those methods, sesseion.flush() and session.evict(object), they work just fine, but I could figure out that I had 2 sessions, I was trying to remove the objects in the second one, when the problem was the first 1(I could not rich the first session because my method creates another instance of session, so the object was lost). I have some other issues, but I'll create a new post. Thanks folk.

Just a suggestion, instead of opening a new session every time, you can use sessionFactory.getCurrentSession() and create a new transaction for each query.

Thanks for the suggestion, getting an existent object is a better way.