[appengine-java] Changing the Parent of a child entity

[Vikas Hazrati]

I have 2 entities UserDepartment and User, which are defined as
follows

@Entity
public class UserDepartment extends DomainObject<Long, UserDepartment>
{

        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long departmentId;

and

@Entity
public class User extends DomainObject<Long, User> {

        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Extension(vendorName = "datanucleus", key = "gae.encoded-pk", value
= "true")
        private String encodedKey;

        @Extension(vendorName = "datanucleus", key = "gae.pk-id", value =
"true")
        private Long userId;

        private String username;
@ManyToOne(fetch = FetchType.EAGER)
        private UserDepartment userDepartment;

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