Как сделать mapping для классов в Spring?

@Entity
@Table(name = "users")
public class User {

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Integer userId;

  @OneToMany(mappedBy = "creator")
  Set<Proposal> creatorsProposal;

  @OneToMany(mappedBy = "performer")
  Set<Proposal> performersProposal;
}

@Entity
@Table(name = "proposals")
public class Proposal {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Integer id;
  @ManyToOne
  @JoinColumn(name = "userId")
  @NotNull
  private User creator;
 
  @ManyToOne
  @JoinColumn(name = "userId")
  private User performer;

Repeated column in mapping for entity: Proposal column: user_id (should be mapped with insert="false" update="false")