我的Service类中的spring-boot @autowired接口（CrudRepository）=>空指针异常

Question

我有一些方法可以使用我的公共界面

@Repository
public interface JobHistoryRepository extends CrudRepository<JobHistory, Long> {

    List<JobHistory> findByJobGroup(String jobGroup);
    JobHistory findById (Integer id);
    List<JobHistory> findByStateAndJobGroup(String state, String jobGroup);
    JobHistory findByJobNameAndJobGroupAndIdTrigger (String jobName, String jobGroup, String idTrigger);

}

我想在myclass服务中使用它

@Service
public class JobHistoryService {

    @Autowired
    private JobHistoryRepository jobHistoryRepository;


    public void setReadyJob(String jobId, String tenant, String idTrigger) {
    JobHistory jobHistory = new JobHistory();
     jobHistory.setJobName(jobId);
     jobHistory.setJobGroup(tenant);
     jobHistory.setIdTrigger(idTrigger);
     jobHistory.setIdUser("12345");
     jobHistory.setState("Ready");
     jobHistory.setDateCreation(new Date());

     jobHistoryRepository.save(jobHistory);   <--- at this point jobHistoryrespository is null why?
    }

编辑：我已经添加了@service和@repository注释到我的类，但这仍然无法正常工作。 每次我使用JobHistoryService方法时，jobRepository依赖项仍为null。

让我知道是否需要添加更多信息。 谢谢。

Answer 1

JobHistoryService

应该也是春豆。 用@Service注释它。

@Service
public class JobHistoryService {
...
}

Answer 2

假设您有如下界面：

public interface JobHistoryRepository extends CrudRepository<JobHistory, Long> {

    List<JobHistory> findByJobGroup(String jobGroup);
    JobHistory findById (Integer id);
    List<JobHistory> findByStateAndJobGroup(String state, String jobGroup);
    JobHistory findByJobNameAndJobGroupAndIdTrigger (String jobName, String jobGroup, String idTrigger);
}

然后创建一个服务类，如：

@Service
public class JobHistoryService {

    private final JobHistoryRepository jobHistoryRepository;

    public JobHistoryService (final JobHistoryRepository jobHistoryRepository)
    {
        this.jobHistoryRepository = jobHistoryRepository;
    }

    public void setReadyJob(String jobId, String tenant, String idTrigger) {
    JobHistory jobHistory = new JobHistory();
     jobHistory.setJobName(jobId);
     jobHistory.setJobGroup(tenant);
     jobHistory.setIdTrigger(idTrigger);
     jobHistory.setIdUser("12345");
     jobHistory.setState("Ready");
     jobHistory.setDateCreation(new Date());

     jobHistoryRepository.save(jobHistory);
    }

希望这可以帮助。

Answer 3

尝试使用此注释

@ComponentScan(basePackages = {"com.blabla.example.*"})

在Spring Boot Application Class上，并检查该路径上是否包含您的存储库接口。

我的例子：

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan(basePackages = {"com.blabla.gg.*"})
public class MyApplication extends SpringBootServletInitializer implements WebApplicationInitializer{
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}