Quarz日程安排作業拋出一些錯誤

Question

我在使用Quarz在基於Spring的Java應用程序中安排作業的問題。這裏是我的自定義工作：

import org.quartz.Job; 
import org.quartz.JobExecutionContext; 
import org.quartz.JobExecutionException; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Component; 

import com.package.UserService; 

@Component 
public class ConnectionIntervalJob implements Job { 

@Autowired 
private UserService userService; 

    public void execute(JobExecutionContext jExeCtx) throws  JobExecutionException { 
     userService.calculateDelta(); 
    } 
} 

我ConnectionScheduler類：

import org.quartz.JobBuilder; 
import org.quartz.JobDetail; 
import org.quartz.Scheduler; 
import org.quartz.SchedulerException; 
import org.quartz.SimpleScheduleBuilder; 
import org.quartz.Trigger; 
import org.quartz.TriggerBuilder; 
import org.quartz.impl.StdSchedulerFactory; 

public class ConnectionScheduler { 
public ConnectionScheduler() throws Exception { 
    Scheduler scheduler = new StdSchedulerFactory().getScheduler(); 
    JobDetail job = JobBuilder 
      .newJob(com.package.ConnectionIntervalJob.class) 
      .withIdentity("job1" + (int)Math.floor(Math.random()*10) + 3 , "group1" +(int)Math.floor(Math.random()*10) + 3).build(); 

    Trigger trigger = TriggerBuilder 
      .newTrigger() 
      .withIdentity("trigger" +(int)Math.floor(Math.random()*10) + 3, "group1" +(int)Math.floor(Math.random()*10) + 3) 
      .withSchedule(
        SimpleScheduleBuilder.simpleSchedule() 
          .withIntervalInSeconds(20).withRepeatCount(5)) 
      .build(); 
    try { 
     scheduler.start(); 
     scheduler.scheduleJob(job, trigger); 
    } catch (SchedulerException e) { 
     e.printStackTrace(); 
    } 
} 
} 

當我建立使用Apache Tomcat 7的控制檯我的項目記錄一些錯誤：

ERROR org.quartz.core.JobRunShell - Job group163.job163 threw an unhandled Exception: 
java.lang.NullPointerException 
at com.package.jobs.ConnectionIntervalJob.execute(ConnectionIntervalJob.java:18) 
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) 
at  org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) 
[DefaultQuartzScheduler_Worker-1] ERROR org.quartz.core.ErrorLogger - Job (group163.job163 threw an exception. 
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: java.lang.NullPointerException] 
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) 
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) 
Caused by: java.lang.NullPointerException 
at com.pakage.jobs.ConnectionIntervalJob.execute(ConnectionIntervalJob.java:18) 
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) 
... 1 more 

我想我我正在弄亂一些與工作名稱和觸發器名稱有關的東西。因此，我決定生成一個隨機int值並將其添加到組名稱和觸發器名稱，但它不起作用。我用下面的鏈接作爲參考： quarz doc

UPDATE：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-2.5.xsd"> 

<!-- Database Configuration --> 
<import resource="DataSource.xml" /> 
<import resource="hibernate.xml" /> 
<bean class="com.package7.config.WebSocketConfig" /> 

<!-- Auto scan the components --> 
<context:annotation-config /> 
<context:component-scan base-package="com.package1.entities" /> 
<context:component-scan base-package="com.package2.ving.controllers" /> 
<context:component-scan base-package="com.package3.dao" /> 
<context:component-scan base-package="com.package4.daoimpl" /> 
<context:component-scan base-package="com.package5.serviceimpl" /> 
<context:component-scan base-package="com.package6.jobs" /> 

任何幫助表示讚賞！謝謝！

Answer 1

因爲石英工作不是由春天創建的，所以你最可能得到NPE，所以注射不會工作。

請嘗試將以下內容作爲​​方法的第一行。

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this); 

這將確保依賴項被注入到作業中。

編輯 你的另一種選擇是使用Spring-quartz集成，而不是使用純石英。