[英]There is null in @Autowired field when try to inject in spring-quartz job?
[英]Spring Boot : Use @Autowired within a Quartz Job
我设法在 Spring Boot(版本 4.2.5)中使用 JobStoreTX 持久存储来配置和安排 Quartz 作业。 这是我安排工作的方式。 第一:
public class MyJob implements Job{
@Autowired
IService service;
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
service.doSomething();
}
}
@Autowired
似乎在 Quartz 作业实现中不起作用,因为它不会被 Spring 实例化。 因此,我面临着著名的 JavaNullPointerException。
其次,为了在 Quartz 作业中获得 Spring 管理的 bean,我使用org.springframework.scheduling.quartz.SchedulerFactoryBean
来管理 Quartz 生命周期:
public class MyJob implements Job{
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
try {
ApplicationContext applicationContext = (ApplicationContext) context.getScheduler().getContext().get("applicationContext");
IService service= applicationContext.getBean(IService.class);
service.getManualMaxConfig();
} catch (SchedulerException e) {
e.printStackTrace();
}
}
}
然后:
<bean id="scheduler"
class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="applicationContextSchedulerContextKey" value="applicationContext" />
</bean>
可悲的消息是我也面临 JavaNPE。 我也尝试了这些建议,但徒劳..
我在做什么有什么问题?
更新 1:在尝试注入服务之前,我尝试按照 @ritesh.garg 的建议传递一些参数。
public class MyJob implements Job{
private String someParam;
private int someParam2;
public void setSomeParam(String someParam) {
this.someParam = someParam;
}
public void setSomeParam2(int someParam2) {
this.someParam2 = someParam2;
}
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
System.out.println("My job is running with "+someParam+' '+someParam2);
}
}
我的 jobBean.xml 看起来像:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="scheduler"
class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="applicationContextSchedulerContextKey" value="applicationContext" />
</bean>
<bean id="myJob" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
<property name="jobClass" value="com.quartz.service.MyJob"/>
<property name="jobDataAsMap">
<map>
<entry key="someParam" value="some value"/>
<entry key="someParam2" value="1"/>
</map>
</property>
</bean>
</beans>
我不知道为什么,但没有传递参数并打印:
My job is running with null 0
Ps:我将 jobBean.xml 导入到 Application.java 中。 所以我不知道我错过了什么?
更新 2:这是我的详细代码:
@Component
public class JobScheduler{
Timer timer = new Timer();
@PostConstruct
public void distributeAutomaticConf(){
try {
timer.schedule(new ServiceImpl(), 10000);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
服务实现:
@Transactional
@Component
public class ServiceImpl extends TimerTask implements IService{
@Override
public void run() {
final SchedulerFactory factory = new StdSchedulerFactory();
Scheduler scheduler = null;
try {
scheduler = factory.getScheduler();
final JobDetailImpl jobDetail = new JobDetailImpl();
jobDetail.setName("My job executed only once.. ");
jobDetail.setJobClass(MyJob.class);
SimpleTrigger trigger = (SimpleTrigger) newTrigger()
.withIdentity("trigger_", "group_")
.build();
scheduler.start();
scheduler.scheduleJob(jobDetail, trigger);
System.in.read();
if (scheduler != null) {
scheduler.shutdown();
}
} catch (final SchedulerException e) {
e.printStackTrace();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
我的工作:
public class MyJob extends QuartzJobBean{
@Autowired
IService service;
@Override
protected void executeInternal(JobExecutionContext arg0) throws JobExecutionException { SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);
service.doSomething();
}
}
jobBean.xml :
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="scheduler"
class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="applicationContextSchedulerContextKey" value="applicationContext" />
</bean>
<bean id="myJob" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
<property name="jobClass" value="com.quartz.service.MyJob"/>
<property name="jobDataAsMap">
<map>
<entry key="someParam" value="some value"/>
<entry key="someParam2" value="1"/>
</map>
</property>
</bean>
</beans>
石英属性:
org.quartz.scheduler.instanceName = DefaultQuartzScheduler
org.quartz.scheduler.rmi.export = false
org.quartz.scheduler.rmi.proxy = false
org.quartz.scheduler.wrapJobExecutionInUserTransaction = false
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount = 10
org.quartz.threadPool.threadPriority = 5
org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread = true
org.quartz.jobStore.misfireThreshold = 60000
org.quartz.jobStore.class = org.quartz.impl.jdbcjobstore.JobStoreTX
org.quartz.jobStore.driverDelegateClass=org.quartz.impl.jdbcjobstore.PostgreSQLDelegate
#org.quartz.jobStore.driverDelegateClass = org.quartz.impl.jdbcjobstore.StdJDBCDelegate
org.quartz.jobStore.dataSource = myDS
org.quartz.jobStore.tablePrefix = QRTZ_
org.quartz.dataSource.myDS.driver = org.postgresql.Driver
org.quartz.dataSource.myDS.URL = jdbc:postgresql://localhost:5432/myDB
org.quartz.dataSource.myDS.user = admin
org.quartz.dataSource.myDS.password = admin
org.quartz.dataSource.myDS.maxConnections = 10
org.quartz.scheduler.skipUpdateCheck=true
控制台:
java.lang.NullPointerException: null
at com.quartz.service.MyJob.executeInternal(MyJob.java:27) ~[classes/:na]
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:113) ~[spring-context-support-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) ~[quartz-2.2.1.jar:na]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.2.1.jar:na]
2016-06-05 11:35:16.839 ERROR 25452 --- [eduler_Worker-1] org.quartz.core.ErrorLogger : Job (DEFAULT.My job executed only once.. threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception.
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) ~[quartz-2.2.1.jar:na]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [quartz-2.2.1.jar:na]
Caused by: java.lang.NullPointerException: null
at com.quartz.service.MyJob.executeInternal(MyJob.java:27) ~[classes/:na]
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:113) ~[spring-context-support-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) ~[quartz-2.2.1.jar:na]
... 1 common frames omitted
我过去遇到过同样的问题。 我对这个问题的理解是,在 spring 上下文中实例化的 bean 不能简单地通过使用@Autowired
注释注入到石英上下文中。
我设法通过使用基于 setter 的依赖注入来解决它。 但是您在原始帖子中添加的“链接”中也提到了同样的内容。
从链接粘贴相关信息:
更新:用extends QuartzJobBean
替换implements Job
public class MyJob extends QuartzJobBean {
private String someParam;
private int someParam2;
public void setSomeParam(String someParam) {
this.someParam = someParam;
}
public void setSomeParam2(String someParam2) {
this.someParam2 = someParam2;
}
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
System.out.println("My job is running with "+someParam+' '+someParam2);
}
}
在这里, someParam 和 someParam2 是通过 setter 依赖注入注入的。 现在使这个完整的另一部分是在jobDataAsMap
传递 someParam 和jobDataAsMap
<bean id="myJob" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
<property name="jobClass" value="com.my.MyJob"/>
<property name="jobDataAsMap">
<map>
<entry key="someParam" value="some value"/>
<entry key="someParam2" value="1"/>
</map>
</property>
</bean>
在您的情况下,它将是 value-ref="IserviceBeanId",而不是条目中的 'value'。 如果这对您不起作用/不起作用,我会感到惊讶和好奇。
我解决了在工作中实施“InitializingBean”的问题;
public class MyJob extends QuartzJobBean implements InitializingBean {
private String someParam;
private int someParam2;
public void setSomeParam(String someParam) {
this.someParam = someParam;
}
public void setSomeParam2(String someParam2) {
this.someParam2 = someParam2;
}
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
System.out.println("My job is running with "+someParam+' '+someParam2);
}
@Override
public void afterPropertiesSet() throws Exception {
}
}
从我见过的大多数例子中,正确的方法是让你的 Job 接口实现成为 @Component
@Component
public class MyJob implements Job{
@Autowired IService service;
@Override
public void execute(JobExecutionContext context) throws JobExecutionException{
service.doSomething();
}
}
我们可以使用 JobDataMap 来传递对象。
例如:这里 restTemplate 是自动装配的。
JobDataMap newJobDataMap = new JobDataMap();
newJobDataMap.put("restTemplate", restTemplate);
JobDetail someJobDetail = JobBuilder
.newJob(QuartzJob.class)
.withIdentity(jobName, GROUP)
.usingJobData(newJobDataMap)
.build();
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