EJB / EE :: Cannot Add Or Update A Child Row When Using EmbeddedID

I have the following objects:

User Object:

public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(unique = true, nullable = false)
private int id;

@OneToMany(fetch = FetchType.EAGER, mappedBy = "user", cascade = CascadeType.ALL)
private List<UserReason> userReasons;
....

Code :

public List<UserReason> getUserReasons() {
return userReasons;
}
public void setUserReasons(List<UserReason> userReasons) {
this.userReasons = userReasons;
}

public UserReason addUserReason(UserReason userReason) {
if (userReasons == null) {
userReasons = new ArrayList<UserReason>();

[Code] ....

I want to be able to add userReason to the list, and that Hibernate will automatically update the reference between the parent & child object.

When using the above code, when trying to start the server, i'm getting the error message:

Repeated column in mapping for entity: com.commit.safebeyond.model.UserReason column: userId (should be mapped with insert="false" update="false")

Please notice that i mapped the userId in UserReasonPK with insertable = false, updatable = false.

If i change it, and add this on the User property in UserReason object, server is up, but when trying to insert new User I'm getting the following error:

Hibernate: insert into UserReasons (reasonId, userId) values (?, ?)
WARN 2015-01-01 13:25:17,488 [http-nio-8080-exec-2] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 1452, SQLState: 23000
ERROR 2015-01-01 13:25:17,488 [http-nio-8080-exec-2] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - Cannot add or update a child row: a foreign key constraint fails (`SafeBeyond`.`UserReasons`, CONSTRAINT `FK_UserReasons_Users` FOREIGN KEY (`userId`) REFERENCES `Users` (`id`))

[Code] ....