我该如何解决？ Java 实体问题

Question

大家好。我在实体连接方面遇到了大问题。 当我想保存到数据库对象 TournamentCompetitorEntity 时 我明白了

ERROR o.a.c.c.C.\[.\[.\[.\[dispatcherServlet\] - 
  Servlet.service() for servlet \[dispatcherServlet\] 
    in context with path \[/ultima\] 
    threw exception 
      Request processing failed: 
        java.lang.IllegalArgumentException: 
          Unable to locate persister: 
            Ultima.infrastructure.database.entity.TournamentCompetitorEntity
    with root cause
      java.lang.IllegalArgumentException: 
        Unable to locate persister: 
          Ultima.infrastructure.database.entity.TournamentCompetitorEntity

可能出了什么问题？ :)

我确实尝试了一切，但只得到错误:(

Answer 1

我创建了自己的简化实现。正如您所看到的，某种程度上关系的管理方式不同，我认为您可以尝试使用它们，以确保这不仅仅是命名的问题

@Builder
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "tournament_competitor")
public class TournamentCompetitorEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String competitorEntity;

    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "tournament_entity_id", referencedColumnName = "id")
    private TournamentEntity tournamentEntity;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "competitor_id")
    private Set<CompetitorEntity> competitorEntities;
}

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "competitor")
public class CompetitorEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String competitor;

}

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Table(name = "tournament")
@Entity
public class TournamentEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String tournament;

    @OneToOne(mappedBy = "tournamentEntity")
    private TournamentCompetitorEntity tournamentCompetitorEntity;

}