what is AttributeOverride annotation used for in Hibernate

Question

@Entity
class User {
@EmbeddedId
@AttributeOverride(name="firstName", column=@Column(name="fld_firstname")
UserId id;
Integer age;
}
@Embeddable
class UserId implements Serializable {
String firstName;
String lastName;
}

I want to know what is the use of AttributeOverride. This is the code from hibernate online docs

Solution

It is for specifying another name for the column in the table other than the one specified in your embedded class.

E.g.