Hi!

I've got a problem.

Everytime I want to change the Identifier of an object connected to a session
and want to save these changes I get the following Exception:


org.hibernate.HibernateException: identifier of an instance of 'MyObject.Class' altered from 1 to 800

But altering the Identifier from 1 to 800 is exactly what I want to do. Can anybody help me?

Code:

The very definition of a primary key is that it does not change.

I do not agree with you. Why shouldn't a PK change.

But maybe Hibernate doesn't support this change.

Hi. If you want to change the PK value in an object, you need to create a new object, copy all values from the first to the second, do the begin transaction, delete the first object, insert the second and commit the transaction.

I think is the unique solution, because Hibernate doesn't allow to change the PK of an object, because this value is used to differentiate it from others objects in the session!

I like to think of primary keys only relating to the database. In your code, who cares about a primary key (except for the occasional lookup)? I suggest you have another colum that is "unique". A unique column that identifies your object that you can understand just by reading it. It will essetially act the same way and you can change it all you want (and do lookups on them). Almost all of my pojos have a name value. That is mapped to a name column in the table that has a unique constraint on it. Hope this helps.