Hello,

I am quite new to hibernate and i would be glad if you could help. A part of the domain are entities action and action_parameter (1:m). The problem arise when i try to save an action that has many parameters with actionDao.save(Entity). Parameters are set with actionDao.setParrameters(ParameterSet set).

Result is an exception:
"a different object with the same identifier value was already associated with the session:com....*** nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session"

What can be an option? should i first try to save the action and after that parameters or can I save them together? I can see that if the ParameterSet has just one object the problem disappears so probably there is a problem with the increment of ids in the parameters entity. How does hibernate know which id is appropriate for a new insert?

Can you suggest me some tutorial how does hibernate execute inserts of objects when the result is written in multiple entities?

Problem was resolved with GenericGenerator on the entity parameters.

@GenericGenerator(name = "id", strategy = "increment")
@GeneratedValue(generator = "id")

thank you,

tamau