Spring Task Scheduler - 没有定义[org.springframework.scheduling.TaskScheduler]类型的限定bean

Question

错误： 未定义类型为[org.springframework.scheduling.TaskScheduler]的限定bean

这是我的控制台日志：

10:32:35.742 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'cronTrigger' to allow for resolving potential circular references
10:32:35.746 [localhost-startStop-1] DEBUG o.s.s.a.ScheduledAnnotationBeanPostProcessor - No @Scheduled annotations found on bean class: class org.springframework.scheduling.support.CronTrigger
10:32:35.747 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'cronTrigger'
10:32:35.747 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating shared instance of singleton bean 'taskExecutor'
10:32:35.747 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'taskExecutor'
10:32:35.747 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'webConfig'
10:32:35.749 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'taskExecutor' to allow for resolving potential circular references
10:32:35.757 [localhost-startStop-1] DEBUG o.s.s.a.ScheduledAnnotationBeanPostProcessor - No @Scheduled annotations found on bean class: class java.util.concurrent.ScheduledThreadPoolExecutor
10:32:35.757 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'taskExecutor'
10:32:35.757 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating shared instance of singleton bean 'getInternalResourceViewResolver'
10:32:35.757 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'getInternalResourceViewResolver'
10:32:35.757 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'webConfig'
10:32:35.770 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'getInternalResourceViewResolver' to allow for resolving potential circular references
10:32:35.781 [localhost-startStop-1] DEBUG o.s.s.a.ScheduledAnnotationBeanPostProcessor - No @Scheduled annotations found on bean class: class org.springframework.web.servlet.view.InternalResourceViewResolver
10:32:35.781 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'getInternalResourceViewResolver'
10:32:35.785 [localhost-startStop-1] DEBUG o.s.w.c.s.AnnotationConfigWebApplicationContext - Unable to locate LifecycleProcessor with name 'lifecycleProcessor': using default [org.springframework.context.support.DefaultLifecycleProcessor@31b09c11]
10:32:35.785 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'lifecycleProcessor'
10:32:35.788 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'delegatingApplicationListener'
10:32:35.788 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.annotation.internalScheduledAnnotationProcessor'
10:32:35.788 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'mvcResourceUrlProvider'
10:32:35.788 [localhost-startStop-1] DEBUG o.s.w.s.resource.ResourceUrlProvider - Looking for resource handler mappings
10:32:35.789 [localhost-startStop-1] DEBUG o.s.w.s.resource.ResourceUrlProvider - No resource handling mappings found
10:32:35.789 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'webConfig'
10:32:35.794 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'cronTrigger'
10:32:35.808 [localhost-startStop-1] DEBUG o.s.s.a.ScheduledAnnotationBeanPostProcessor - Could not find default TaskScheduler bean

//Exception Starts from here.
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.scheduling.TaskScheduler] is defined
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:371) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:331) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.finishRegistration(ScheduledAnnotationBeanPostProcessor.java:183) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:162) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:85) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:151) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:128) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:331) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:773) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:483) [spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) [spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) [spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) [spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4726) [catalina.jar:8.0.20.B]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5162) [catalina.jar:8.0.20.B]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [catalina.jar:8.0.20.B]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) [catalina.jar:8.0.20.B]
     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) [catalina.jar:8.0.20.B]
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) [catalina.jar:8.0.20.B]
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:581) [catalina.jar:8.0.20.B]
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1683) [catalina.jar:8.0.20.B]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_45]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_45]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]
10:32:35.809 [localhost-startStop-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Returning cached instance of singleton bean 'taskExecutor'
10:32:35.827 [localhost-startStop-1] DEBUG o.s.c.e.PropertySourcesPropertyResolver - Searching for key 'spring.liveBeansView.mbeanDomain' in [servletConfigInitParams]
10:32:35.827 [localhost-startStop-1] DEBUG o.s.c.e.PropertySourcesPropertyResolver - Searching for key 'spring.liveBeansView.mbeanDomain' in [servletContextInitParams]
10:32:35.827 [localhost-startStop-1] DEBUG o.s.c.e.PropertySourcesPropertyResolver - Searching for key 'spring.liveBeansView.mbeanDomain' in [jndiProperties]
10:32:35.827 [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [java:comp/env/spring.liveBeansView.mbeanDomain]
10:32:35.830 [localhost-startStop-1] DEBUG o.s.jndi.JndiLocatorDelegate - Converted JNDI name [java:comp/env/spring.liveBeansView.mbeanDomain] not found - trying original name [spring.liveBeansView.mbeanDomain]. javax.naming.NameNotFoundException: Name [spring.liveBeansView.mbeanDomain] is not bound in this Context. Unable to find [spring.liveBeansView.mbeanDomain].
10:32:35.830 [localhost-startStop-1] DEBUG o.springframework.jndi.JndiTemplate - Looking up JNDI object with name [spring.liveBeansView.mbeanDomain]

这是WebConfig.java：

@Configuration
@EnableScheduling
@EnableWebMvc
@ComponentScan(basePackages="com.project")
public class WebConfig implements SchedulingConfigurer 
{    
protected static final Logger slf4jLogger  = Logger.getLogger(WebConfig.class.getName());
private static final String cronExpression = "0 0 * * * ?";



/*@Bean
public MobileNotifSchedulerBean schedulerbean()
{
    return new MobileNotifSchedulerBean();
}*/

@Bean
public InternalResourceViewResolver getInternalResourceViewResolver()
{
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/jsp/");
    resolver.setSuffix(".jsp");
    resolver.setSuffix(".html");
    resolver.setSuffix(".htm");
    return resolver;
}

@Bean
CronTrigger cronTrigger() 
{
    //String timeZone = "Asia/Calcutta";

    String timeZone = null;
    HashSet<String> userTimeZonesfromDB = FetchUserTimeZones.fetchUserTimeZone();
    for (String s : userTimeZonesfromDB) 
    {
        timeZone = s;
        slf4jLogger.info(s);
    }
    return new CronTrigger(cronExpression, TimeZone.getTimeZone(timeZone));
}


@Override
public void configureTasks(ScheduledTaskRegistrar taskRegistrar) 
{

    taskRegistrar.addCronTask(new CronTask(new MobileNotifSchedulerBean(), cronTrigger()));
}

@Bean(destroyMethod="shutdown")
public Executor taskExecutor() 
{
    return Executors.newScheduledThreadPool(1);
}   
}

这是我的MobileNotifSchedulerBean：

@EnableScheduling
public class MobileNotifSchedulerBean implements Runnable 
{
protected static final Logger slf4jLogger  = Logger.getLogger(MobileNotifSchedulerBean.class.getName());


public void sendQuestionNotif() 
{
    try 
    {
        HashSet<String> reg_ids = FetchRegistrationIDs.fetchItems();
        for (String s : reg_ids) 
        {
            String REGISTRATION_IDs = s;
            slf4jLogger.info(s);                
            MobileSNSPushNotification.sendNotification(REGISTRATION_IDs);
        }
    } 
    catch (IOException e) 
    {
        //e.printStackTrace();
        slf4jLogger.error(e);
        slf4jLogger.error(e.getMessage());
        slf4jLogger.error(e.getStackTrace());
    }
}


@Override
public void run() 
{
    sendQuestionNotif();
}
}

我正在使用Java 8和Spring MVC 4.我想解决这个错误“没有定义[org.springframework.scheduling.TaskScheduler]类型的限定bean”请帮助我。 TIA。

Answer 1

从org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.inishRegistration（）记录此异常：

if (this.registrar.hasTasks() && this.registrar.getScheduler() == null) {
    Assert.state(this.beanFactory != null, "BeanFactory must be set to find scheduler by type");
    try {
        // Search for TaskScheduler bean...
        this.registrar.setTaskScheduler(this.beanFactory.getBean(TaskScheduler.class));
    }
    catch (NoSuchBeanDefinitionException ex) {
        logger.debug("Could not find default TaskScheduler bean", ex);
        // Search for ScheduledExecutorService bean next...
        try {
            this.registrar.setScheduler(this.beanFactory.getBean(ScheduledExecutorService.class));
        }
        catch (NoSuchBeanDefinitionException ex2) {
            logger.debug("Could not find default ScheduledExecutorService bean", ex);
            // Giving up -> falling back to default scheduler within the registrar...
        }
    }
}

此过程尝试为注册器设置任务计划程序。 为此，它尝试通过BeanFactory.getBean方法查找已注册的调度程序bean：

1. 尝试找到已配置的TaskScheduler bean ，如果找不到，则回退到 - >
2. 找到ScheduledExecutorService bean ，如果没有找到，则回退到 - >
3. 使用注册器中的默认调度程序 （上面的代码注释中显示了相同的内容： //放弃 - >回退到注册器中的默认调度程序... ）

如果在容器中找不到任何TaskScheduler或ScheduledExecutorService bean，BeanFactory.getBean将抛出异常。

ScheduledAnnotationBeanPostProcessor反过来使用DEBUG级别记录这些异常：

logger.debug("Could not find default TaskScheduler bean", ex);
logger.debug("Could not find default ScheduledExecutorService bean", ex);

因此，总之，这些异常只是在为任务调度程序bean找到回退选项的过程中记录，并且它们不会影响应用程序的执行。

可以提升此类的日志级别，以便不会记录这些DEBUG级别消息，如下所示：

<!-- Elevate the log level for 'org.springframework.scheduling' since in
     process of registering the scheduled task, Spring's
     ScheduledAnnotationBeanPostProcessor tries to find TaskScheduler and
     ScheduledExecutorService beans and then fallbacks to its internal
     scheduler but in the process logs exceptions when it cannot find those
     beans registered.
-->
<logger name="org.springframework.scheduling">
    <level value="info" />
</logger>

Answer 2

使用@Configurable保护您的MobileNotifSchedulerBean 。 我认为它会起作用。