与存储库相关的方法只返回null值

Question

@Entity
@Table(name = "matches", schema = "tennis", catalog = "")
public class MatchesEntity {
    private int id;
    private String namePlayer1;
    private String namePlayer2;
    private int setsPlayer1;
    private int setsPlayer2;
    private String odd1;
    private String odd2;
    private String competition;
    private String surface;
    private String status;

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "Name_player1")
    public String getNamePlayer1() {
        return namePlayer1;
    }

    public void setNamePlayer1(String namePlayer1) {
        this.namePlayer1 = namePlayer1;
    }

    @Basic
    @Column(name = "Name_player2")
    public String getNamePlayer2() {
        return namePlayer2;
    }

    // other getter & setters
}

@Repository
public interface MatchesRepository extends CrudRepository<MatchesEntity, 
Integer> {

     List<MatchesEntity> getAllBySurface(String surface);

}

@Service
public class MatchesService {

@Autowired
MatchesRepository matchesRepository;

public int countMatchesOnHard() {
    return matchesRepository.getAllBySurface("hard").size();
}

public MatchesEntity findMatchById() {
    return matchesRepository.findById(2378).get();
}

}

主类：

 @SpringBootApplication
 @EnableJpaRepositories(basePackageClasses={MatchesRepository.class})
 @EntityScan(basePackageClasses=MatchesEntity.class)
 public class PicksApplication {

     @Autowired
     static MatchesService matchesService;

     public static void main(String[] args) {
         MatchesEntity matchesEntity = matchesService.findMatchById();
         int numberOfMatchesOnHard = matchesService.countMatchesOnHard();
         System.out.println(numberOfMatchesOnHard);
   }
}

我尝试的任何与存储库相关的方法都返回null。有人能帮我提个建议吗？

Answer 1

您的主类PicksApplication很麻烦。main方法必须触发SpringApplication.run，以便Spring Boot初始化它自己&autowires工作的上下文。您在代码中破坏了所有这些。您可以利用CommandLineRunner并在run()方法中添加代码。

像这样；

@SpringBootApplication
public class PicksApplication implements CommandLineRunner {

    @Autowired
    private MatchesService matchesService;

    public static void main(String[] args) {
        SpringApplication.run(PicksApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
         MatchesEntity matchesEntity = matchesService.findMatchById();
         int numberOfMatchesOnHard = matchesService.countMatchesOnHard();
         System.out.println(numberOfMatchesOnHard);
    }
}

那么它应该可以工作了，其余的代码看起来还可以