Hello,

I don’t understand the behavior of Hibernate in Many-to-One relationships, when the foreign key is also part of primary key.

I have, for example, these classes:

@Entity
public class Country implements Serializable {
@Id
private String name;
…
}

and

@Entity
@IdClass(value=StateId.class)
public class State implements Serializable {
@Id
private String name;
@Id
@ManyToOne
private Country country;
…
}

Every time you try to make persistent a new object of State class, also hibernate tries to insert a new Country record in the system.
The problem is that relationship is Many-to-One. Often it's probably, the country exists in database and therefore a constrain violation primary key is thrown.
I think if you make persistent a new State object, the value of the Country that is part of the primary key should be previously persistent and therefore Hibernate shouldn’t attempt to insert a new country record.

Is there any way change the default behavior of Hibernate?

Thanks in advanced
Josep