Hibernate version: 2.1.4

I want to verify the changes made to the properties of a bean.
Consider this Class:

public class Test {

private String tes1;
private String tes2;

public String getTest1() {
return test1;
}
public void setTest1(String tes1) {
this.test1 = test1
}
public String getTest2() {
return test2;
}
public void setTest2(String tes2) {
this.test2 = test2
}
}

---
The valid states for a bean of this class are:
State1: tes1 = "1";test2 = "1"
and
State2: tes1 = "1";test2 = "2"
and
State3: tes1 = "2";test2 = "1"
and
State4: tes1 = "2";test2 = "2"
---
Possible state changes:
State1 to State2;
State2 to State3;
State3 to State4;
State4 to State5;

---
I want to verify the consistency and state changes of a bean.
---
To verify if the bean has a valid state i

How is Hibernate involved in this issue? Can you elaborate a bit more?

let me explain ... My doubt is how I can acess a bean database state before saving it?
---
Ex:
....
Session session1 = ...
...
Car car = (Car) session1.get(Car.class,"1");
...
session1.close();
....
car.setColor("blue");
...
Session session2 = ...

/*In this moment i want to retrieve the car "1" from the database to compare the values from the database register and the object "car".
Then i do ...
*/

Car car2 = (Car) session2.get(Car.class,"1");
car1.verifyChanges(car2);

session2.update(car1);
/*When i call this method i receive a NonUniqueObjectIdetifier.*/

How can i compare the values from the persistent bean and the deatached bean and after that update or save the deatached object?

Ps.
If you know a better solution for verifying the bean state changes please tell me.
It's like a database constraint verification that depends on the old register value and the new register value.
----

I don't think this problem is related to Hibernate at all - except you want the verification to be made before commit to the DB.

You have exactly the same problem when validating the fields of a screen form. The validation can only be done when the user explicitly says it has entered all the values (press submit). At this time, you have the state2 and you can compare it with state1 - provided you took a copy of the previous state (or recorded the property changes).

You should do the same with your application - and unfortunaly Hibernate won't help you that much on this issue...