Use @PrimaryKeyJoinColumn

http://www.java2s.com/Tutorials/Java/JPA/0730__JPA_OneToOne_Primary_Key_Join.htm



@Entity

public class Person {

  @Id

  @GeneratedValue(strategy=GenerationType.IDENTITY)

  private long id;

   
  private String name;
  @OneToOne

  @PrimaryKeyJoinColumn
  private Department department;
  

when you want to use Person's id to join with Department's id

If in Person entity have a FK with name "departmentID" then you should use @JoinColumn


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