Could not find default TaskScheduler bean

这个问题是 spring 使用 TaskScheduler 开启了 debug模式  造成的 

logging.level.root=debug 如果使用debug 在此处 就会报下面的错 

如果 想使用的话可以将此项排除掉  
logging.level.org.springframework.scheduling=info

logging.level.org.springframework.web=DEBUG

020-02-14 16:29:39.427 DEBUG 3300 --- [  restartedMain] s.a.ScheduledAnnotationBeanPostProcessor : Could not find default TaskScheduler bean

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.scheduling.TaskScheduler' available
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:992) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.resolveSchedulerBean(ScheduledAnnotationBeanPostProcessor.java:293) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.finishRegistration(ScheduledAnnotationBeanPostProcessor.java:234) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:211) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:102) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:399) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:353) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:887) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:161) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at com.visystem.GabClientDownloadApplication.main(GabClientDownloadApplication.java:29) [classes/:?]
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45]
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_45]
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_45]
  at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_45]
  at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.0.RELEASE.jar:2.0.0.RELEASE]

2020-02-14 16:29:39.417 DEBUG 3300 --- [SchedulerThread] o.q.c.QuartzSchedulerThread              : batch acquisition of 0 triggers
2020-02-14 16:29:39.437 DEBUG 3300 --- [  restartedMain] s.a.ScheduledAnnotationBeanPostProcessor : Could not find default ScheduledExecutorService bean

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.util.concurrent.ScheduledExecutorService' available
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:992) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.resolveSchedulerBean(ScheduledAnnotationBeanPostProcessor.java:293) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.finishRegistration(ScheduledAnnotationBeanPostProcessor.java:255) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:211) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:102) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:399) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:353) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:887) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:161) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) [spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
  at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234) [spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
  at com.visystem.GabClientDownloadApplication.main(GabClientDownloadApplication.java:29) [classes/:?]
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45]
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_45]
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_45]
  at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_45]
  at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.0.RELEASE.jar:2.0.0.RELEASE]

源代码如下：这个错误可以忽略 如果看着难受 就按照上边的修改了即可

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(resolveSchedulerBean(beanFactory, TaskScheduler.class, false));
      }
      catch (NoUniqueBeanDefinitionException ex) {
        logger.debug("Could not find unique TaskScheduler bean", ex);
        try {
          this.registrar.setTaskScheduler(resolveSchedulerBean(beanFactory, TaskScheduler.class, true));
        }
        catch (NoSuchBeanDefinitionException ex2) {
          if (logger.isInfoEnabled()) {
            logger.info("More than one TaskScheduler bean exists within the context, and " +
                "none is named 'taskScheduler'. Mark one of them as primary or name it 'taskScheduler' " +
                "(possibly as an alias); or implement the SchedulingConfigurer interface and call " +
                "ScheduledTaskRegistrar#setScheduler explicitly within the configureTasks() callback: " +
                ex.getBeanNamesFound());
          }
        }
      }
      catch (NoSuchBeanDefinitionException ex) {
        logger.debug("Could not find default TaskScheduler bean", ex);
        // Search for ScheduledExecutorService bean next...
        try {
          this.registrar.setScheduler(resolveSchedulerBean(beanFactory, ScheduledExecutorService.class, false));
        }
        catch (NoUniqueBeanDefinitionException ex2) {
          logger.debug("Could not find unique ScheduledExecutorService bean", ex2);
          try {
            this.registrar.setScheduler(resolveSchedulerBean(beanFactory, ScheduledExecutorService.class, true));
          }
          catch (NoSuchBeanDefinitionException ex3) {
            if (logger.isInfoEnabled()) {
              logger.info("More than one ScheduledExecutorService bean exists within the context, and " +
                  "none is named 'taskScheduler'. Mark one of them as primary or name it 'taskScheduler' " +
                  "(possibly as an alias); or implement the SchedulingConfigurer interface and call " +
                  "ScheduledTaskRegistrar#setScheduler explicitly within the configureTasks() callback: " +
                  ex2.getBeanNamesFound());
            }
          }
        }
        catch (NoSuchBeanDefinitionException ex2) {
          logger.debug("Could not find default ScheduledExecutorService bean", ex2);
          // Giving up -> falling back to default scheduler within the registrar...
          logger.info("No TaskScheduler/ScheduledExecutorService bean found for scheduled processing");
        }
      }
    }