java - JPA modelling, one-to-one relation? -

i new jpa , stuggles defining relations between classes. have class called player , class called game. game holds references 2 player instances. question is, how should modelled?

this current code:

@entity @table(name = "t_player") @jsonserialize(include=jsonserialize.inclusion.non_null) public class player {      @id     @generatedvalue(strategy = generationtype.identity)     private long id;      @basic     @column(name = "name")     private string name;      @basic     @column(name = "uuid")     private final string uuid = uuid.randomuuid().tostring(); 

i think ok, problem in game class:

@entity @table(name = "t_game") @jsonserialize(include=jsonserialize.inclusion.non_null) public class game {      public game() {      }      @id     @generatedvalue(strategy = generationtype.identity)     private long id;      @basic     @column(name = "uuid")     private final string uuid = uuid.randomuuid().tostring();      @onetoone     @primarykeyjoincolumn     @joincolumn(name = "id")     private player player_1;      @onetoone     @primarykeyjoincolumn     @joincolumn(name = "player_2")     private player player_2;      public game(player player_1, player player_2) {         this.player_1 = player_1;         this.player_2 = player_2;     }  } 

this not working, table t_game has 2 field; id , uuid. problem?

remove primarykeyjoincolumn annotation, don't think meant use, conflicts joincolumn definition. use joincolumn annotation instead define foreign key field name , field references if necessary.