the box class ...
public class Box extends AbstractBox implements java.io.Serializable{
private User TUserInfo;
private Integer boxid;
private String boxname;
public Box(Integer boxid, User TUserInfo, String boxname) {
super(boxid, TUserInfo, boxname);
}
.....get set mehod .....
}

the user class
pubilc class User extends AbstractUser implements java.io.Serializable {
private Integer userid;
private Integer username;
private Set TUserBoxes = new HashSet(0);
.....get set mehod .....
}

user(one) ------ box(many)


is hql ....
select new Box(a.boxid,a.TUserInfo,a.boxname) from Box a
---------------------------------------------------------------------
console sql .....
select
box0_.boxid as col_0_0_,
box0_.userid as col_1_0_,
box0_.boxname as col_2_0_
from test.t_user_box box0_, test.t_user_info user1_
where box0_.userid=user1_.userid
---------------------------------------------------------------------
what is only userid? username?

is hql ...
select a.boxid,a.boxname,a.TUserInfo from Box a
---------------------------------------------------------------------
select
box0_.boxid as col_0_0_,
box0_.boxname as col_1_0_,
box0_.userid as col_2_0_,
user1_.userid as userid, user1_.
username as username2_
from test.t_user_box box0_, test.t_user_info user1_
where box0_.userid=user1_.userid
---------------------------------------------------------------------
now userid and username being

hql
select new Box(intger,new User(intger,string),string) from box
in this way may?

I couldnt understand clearly from your post, Try the following code if your intent is to get Box and User object using HQL option.