Quartz生成未处理的空指针异常

时间:2018-05-14 09:00:35

标签: java spring spring-boot quartz-scheduler

因此,我在不同的Spring配置文件上设置了2个调度程序。当我运行Spring调度程序时,一切正常,但他们希望我实现Quartz。

这是一个Job类:

@Profile("quartz")
@Component
public class SampleJob implements Job {

@Autowired
private GetDataServiceQuartz getDataServiceQuartz;

public SampleJob() {
}

public SampleJob(GetDataServiceQuartz getDataServiceQuartz) {
    this.getDataServiceQuartz = getDataServiceQuartz;
}

@Override
public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {

    this.getDataServiceQuartz.storeData();
}
}

抛出错误:

org.quartz.SchedulerException: Job threw an unhandled exception.
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) ~[quartz-2.2.1.jar:na]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.2.1.jar:na]
Caused by: java.lang.NullPointerException: null
at com.example.blockchaininfo.services.Quartz.SampleJob.execute(SampleJob.java:27) ~[classes/:na]
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) ~[quartz-2.2.1.jar:na]
... 1 common frames omitted

此特定行上会引发nullPointerException

this.getDataServiceQuartz.storeData();

我尝试打印this.getDataServiceQuartz时会打印null

完成所有工作的课程:

@Slf4j
@Service
@Profile("quartz")
public class GetDataServiceQuartz{

constructorHere();

public void storeData(){

        try {
            String hashrateFromApi = this.getNetworkHashrateFromApi("http://public.turtlenode.io:11898/getinfo");
            OffsetDateTime date = OffsetDateTime.now();

            this.saveNetworkHashrateNewEntity(hashrateFromApi, date);
            this.storePoolDataToDB(this.getPoolsListFromJson(), retrieveNetworkIdForPoolDefinition(date));

        } catch (HttpServerErrorException e){
            log.info("Network Server error e1: " + e);
        } catch (ResourceAccessException e2){
            log.info("Network resource access exception: " + e2);
        } catch (IOException e3) {
            log.info("" + e3);
        } catch (InterruptedException e4){
            log.info("" + e4);
        }
}

...all other methods to acquire stuff.

和Quartz配置。

@Override
public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent){

    this.startQuartzScheduling();
}

public void startQuartzScheduling () {

    JobDetail job = JobBuilder.newJob(SampleJob.class)
            .withIdentity("dummyJobName", "group1").build();

    Trigger trigger = TriggerBuilder
            .newTrigger()
            .withIdentity("dummyTriggerName", "group1")
            .withSchedule(
                    SimpleScheduleBuilder.simpleSchedule()
                            .withIntervalInSeconds(5).repeatForever())
            .build();

    try {
        Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
        scheduler.start();
        scheduler.scheduleJob(job, trigger);
    } catch (SchedulerException e){
        log.info("" + e);
    }
}

我错过了什么?如何正确地注入一个应该安排其方法的类?

1 个答案:

答案 0 :(得分:2)

我认为这是一个很好的因为石英JobBuilder创建了SampleJob的新实例,而不是使用自动装配字段创建的实例。因为它使用默认构造函数作为结果,所以你有nullpointer。

解决此问题的一个选项是将GetDataServiceQuartz放入调度程序上下文。

描述here

因此,要输入您需要调用的数据:

scheduler.getContext().put("getDataServiceQuartz", getDataServiceQuartz);

执行任务时:

SchedulerContext schedulerContext = jobExecutionContext.getScheduler().getContext();
schedulerContext.get("getDataServiceQuartz");

其他,在我看来更方便的方法是将它放到JobDataMapSampleJob

job.getJobDataMap().put("getDataServiceQuartz", getDataServiceQuartz);

执行任务时:

context.getJobDetail().getJobDataMap().get("getDataServiceQuartz")

可以找到完整示例here

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