用Spring创建调度程序Bean时发生NullPointerException

我正在尝试使用Spring创建调度程序。用Spring创建调度程序Bean时发生NullPointerException

@Configuration 
@EnableScheduling 
public class MyScheduler { 


    @Autowired 
    MyBusinessService businessService; 


    @Scheduled(cron = "* * * * * *") 
    public void myCronMethod() { 

    } 
}

在应用程序启动时，我得到以下错误：

java.lang.NullPointerException 
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.resolveSchedulerBean(ScheduledAnnotationBeanPostProcessor.java:281) 
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.finishRegistration(ScheduledAnnotationBeanPostProcessor.java:221) 
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:200) 
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:94) 
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167) 
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) 
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:383) 
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:337) 
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:882) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) 
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) 
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) 
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) 
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5068) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5584) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1572) 
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1562) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745)

在ScheduledAnnotationBeanPostProcessor持有人是空：

NamedBeanHolder<T> holder = ((AutowireCapableBeanFactory) this.beanFactory).resolveNamedBean(schedulerType);

的schedulerType是：

interface org.springframework.scheduling.TaskScheduler

该应用程序是一个JSF应用程序。即时通讯使用Java 8和春天版本4.3.6，但与Ant和没有依赖管理，因此缺少库或库不匹配是一种可能性。

来源

2017-07-28 schrobe

它是一个Java程序和一个来自标准库的异常，我认为这个标记足够了！？ – schrobe

我无法在没有Java的情况下重现它 – schrobe

继续吧，标记它java，键盘，鼠标，显示器，电，眼睛，大脑......服务器正在启动，spring正在初始化，jsf还没有做任何事情。 – Kukeltje

刚走了同样的错误在科特林应用，我的解决方法是手动将TaskScheduler添加到我的应用程序配置：

Java的例子是采取from here。

@Bean 
public ThreadPoolTaskScheduler threadPoolTaskScheduler(){ 
    ThreadPoolTaskScheduler threadPoolTaskScheduler 
     = new ThreadPoolTaskScheduler(); 
    threadPoolTaskScheduler.setPoolSize(5); 
    threadPoolTaskScheduler.setThreadNamePrefix(
     "ThreadPoolTaskScheduler"); 
    return threadPoolTaskScheduler; 
}

我科特林版本

@Bean 
fun threadPoolTaskScheduler() 
    = ThreadPoolTaskScheduler().apply { 
     setPoolSize(5) 
     setThreadNamePrefix("ThreadPoolTaskScheduler") 
}

（我还没有尝试过，但我相信升级到弹簧5也将解决这个问题 - this commit抛出一个异常的空指针会一直生成。）

来源

2017-08-17 13:54:50

用Spring创建调度程序Bean时发生NullPointerException

回答

相关问题