java - JPA OneToOne join issue -

here simplecost entity

@entity @table(name="simplecost") public class simplecost { @id  @generatedvalue(strategy = generationtype.identity)    private long id;  private long userid;  private long cost;  @onetoone(cascade=cascadetype.all,fetch = fetchtype.eager)  @joincolumn(name = "userid")  private userbare user; } 

userbare:

@entity @table(name="user") public class userbare{  @id  @generatedvalue(strategy = generationtype.identity)    private long id;  private long userid;  private string fname;  private string lname; } 

so i'm having trouble populating simplecost.user attribute. need use simplecost.userid retreive user table data , fill simplecost.user object. here database structure.

database tables: user

create table `user` ( `id` bigint(20) not null auto_increment, `fname` varchar(100) default null, `lname` varchar(100) default null, `mname` varchar(100) default null, `title` varchar(100) default null, `email` varchar(100) default null,  primary key (`id`),  unique key `id_unique` (`id`)  ) engine=innodb auto_increment=9 default charset=latin1;  /*!40101 set character_set_client = @saved_cs_client */; 

simplecost

create table `simplecost` ( `id` bigint(20) not null auto_increment, `userid` bigint(20) default null, `liablecost` decimal(10,2) default null, `isactive` tinyint(1) default null, primary key (`id`), unique key `id_unique` (`id`), key `fk_simplecost_user1_idx` (`userid`), constraint `fk_simplecost_user` foreign key (`userid`) references `user`      (`id`) on delete no action on update no action ) engine=innodb auto_increment=13 default charset=latin1; /*!40101 set character_set_client = @saved_cs_client */; 

you don't need 'userid' columns defined in entity (java class). 1 in userbare useless , 1 in simplecost created/used because of @joincolumn(name = "userid") added 'user' field'

remove private long userid; both entity declaration.

other that, need define "having trouble populating simplecost.user attribute".