java - Spring boot JPA空指针异常

Question

我正在使用 Spring Boot、JPA 和 H2 开发 JavaFx 应用程序。当我尝试将新用户添加到数据库中时，我有一个用户实体，它会在按钮的单击操作上在 Controller 中抛出 NPE。正如所见，我只使用 Autowiring 符号。我研究过 但调查结果并没有帮助。请问有什么帮助吗？

package com.core;

@SpringBootApplication
@Import(SharedSpringConfiguration.class)
public class Runner extends Application {

   private ConfigurableApplicationContext context;

   public static void main(String[] args) {
     launch(args);        
   }

   @Override
   public void init() {
    context = SpringApplication.run(Runner.class);
   }
}

package com.dao;

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

    @Id
    @Column(name = "id", updatable = false, nullable = false)
    private long ID;
    @Column(nullable = false)
    private String userName;
    @Column(nullable = false)
    private String userPass;

    public User() {
    }

    public User(long ID, String userName, String userPass) {
        this.ID = ID;
        this.userName = userName;
        this.userPass = userPass;
    }
}

package com.service;

@Service
public class UserService {

   @Autowired
   private UserRepository userRepository;

   public UserService() {
   }

   public void saveUser(User user) {
     userRepository.save(user);
   }
}

package com.repository;
public interface UserRepository extends CrudRepository<User, Long> {}

package com.controller

@Controller
public class MethodController implements Initializable {

  @Autowired
  private UserService userService;

  @FXML
  void methodSave(MouseEvent event) {
    userService.saveUser(new User(11, "TestUser", "noPass")); //Throws NPE. Indicates that userService is null. But I autowire the userService.
  }
}

Answer 1

我不知道 SharedSpringConfiguration 中有什么，但您的配置类之一可能需要 @EnableJpaRepositories。 CrudRepo 上的 @Repository 应该是不必要的。