Question

我使用Quartz调度程序运行作业，在这里，我正在获取Null指针异常自动连线对象的QuartzJobBean扩展类，即DailyEmailsJob {testService.ts（）;}

请在下面找到代码

这是调度程序类，在这里我称为DailyEmailsJob类

 @Component
    public interface EmailSchedulers {

        void dailyEmailTrigger();

        @Service
        @Transactional
        @Slf4j
        public class Impl implements EmailSchedulers{

            @Override
            public void dailyEmailTrigger() {

            JobDetail job = JobBuilder.newJob(DailyEmailsJob.class)
                                        .withIdentity("DailyEmail", "group1")
                                        .build();

            Trigger trigger = TriggerBuilder.newTrigger()
                                            .withIdentity("DailyEmailTrigger", "group1")
                                            .withSchedule(CronScheduleBuilder.cronSchedule("0 0 3 * * ?"))   //At 03:00:00am every day
                                            .build();

            //schedule it
            Scheduler scheduler;
            try {
                scheduler = new StdSchedulerFactory().getScheduler();
                scheduler.start();
                scheduler.scheduleJob(job, trigger);
            } catch (SchedulerException e) {
                e.printStackTrace();
                log.info("erorrrrrrrrrrrrrrrrrr");
            }

            }
    }

QuartzJobBean扩展类，在这里testService.ts（）;我得到了Null指针，如错误所示。

 @Slf4j
 @Component
 public class DailyEmailsJob extends QuartzJobBean {

        @Autowired
        private TestService testService;    

            @Override
        protected void executeInternal(JobExecutionContext arg0) throws JobExecutionException {
            log.info("**************** DAILY SCHEDULER STARTED*****************");
            testService.ts(); // Getting null pointer
            log.info("**************** DAILY SCHEDULER ENDEND*****************");
        }   
    }

这是我在DailyEmailsJob类中注入的服务类

@Component
    public interface TestService {

        void ts();

        @Slf4j
        @Service
        public class Impl implements TestService{

            @Override
            public void ts() {
                 log.info("SERVICE WORKED");
            }
            }
    }

这是错误：

2018-09-23 03:00:00.040  INFO 6020 --- [eduler_Worker-1] DailyEmailsJob         : **************** DAILY SCHEDULER STARTED*****************
2018-09-23 03:00:00.041 ERROR 6020 --- [eduler_Worker-1] org.quartz.core.JobRunShell              : Job group1.DailyEmail threw an unhandled Exception:

java.lang.NullPointerException: null
        at DailyEmailsJob.executeInternal(DailyEmailsJob.java:42) ~[classes/:na]
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:75) ~[spring-context-support-5.0.4.RELEASE.jar:5.0.4.RELEASE]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202) ~[quartz-2.3.0.jar:na]
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.3.0.jar:na]

2018-09-23 03:00:00.042 ERROR 6020 --- [eduler_Worker-1] org.quartz.core.ErrorLogger              : Job (group1.DailyEmail threw an exception.

org.quartz.SchedulerException: Job threw an unhandled exception.
        at org.quartz.core.JobRunShell.run(JobRunShell.java:213) ~[quartz-2.3.0.jar:na]
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.3.0.jar:na]
Caused by: java.lang.NullPointerException: null
        at DailyEmailsJob.executeInternal(DailyEmailsJob.java:42) ~[classes/:na]
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:75) ~[spring-context-support-5.0.4.RELEASE.jar:5.0.4.RELEASE]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202) ~[quartz-2.3.0.jar:na]
        ... 1 common frames omitted

Answer 1

将以下行添加到executeInternal类的DailyEmailsJob方法的开头：

@Override
public void executeInternal(final JobExecutionContext context) throws JobExecutionException {
    // Adding this autowires everything as needed
    SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);    
    ...
}

在QuartzJobBean扩展类中使用依赖注入获取NULL POINTER

这是错误：

1 个答案: