解决：java.lang.IllegalStateException: ThreadPoolTaskScheduler not initialized报错

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这个是Spring boot多线程实现定时任务时的报错，解决方案在最下面；

报错信息：

java.lang.IllegalStateException: ThreadPoolTaskScheduler not initialized
	at org.springframework.util.Assert.state(Assert.java:70) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler.getScheduledExecutor(ThreadPoolTaskScheduler.java:155) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler.schedule(ThreadPoolTaskScheduler.java:297) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.config.ScheduledTaskRegistrar.scheduleCronTask(ScheduledTaskRegistrar.java:409) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.config.ScheduledTaskRegistrar.scheduleTasks(ScheduledTaskRegistrar.java:349) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.config.ScheduledTaskRegistrar.afterPropertiesSet(ScheduledTaskRegistrar.java:330) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.finishRegistration(ScheduledAnnotationBeanPostProcessor.java:273) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:204) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.onApplicationEvent(ScheduledAnnotationBeanPostProcessor.java:98) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
	at com.ai.rai.group.system.SystemBootStartApplication.main(SystemBootStartApplication.java:41) [classes/:na]

代码：

package com.ai.rai.group.system;

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.stereotype.Component;

import java.util.concurrent.Executor;

/**
 * @version 1.0
 * @ClassName ScheduleConfig
 * @Description todo
 * @Author 74981
 * @Date 2018/8/31 16:24
 */
@Component
@EnableScheduling
public class ScheduleConfig implements SchedulingConfigurer, AsyncConfigurer {
    /*
     * 并行任务
     */
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar)
    {
        TaskScheduler taskScheduler = taskScheduler();
        taskRegistrar.setTaskScheduler(taskScheduler);
    }

    /**
     * 并行任务使用策略：多线程处理
     *
     * @return ThreadPoolTaskScheduler 线程池
     */
    @Bean(destroyMethod = "shutdown")
    public ThreadPoolTaskScheduler taskScheduler()
    {
        ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
        scheduler.setPoolSize(20);
        scheduler.setThreadNamePrefix("task-");
        scheduler.setAwaitTerminationSeconds(60);
        scheduler.setWaitForTasksToCompleteOnShutdown(true);
        return scheduler;
    }

    /*
     * 异步任务
     */
    public Executor getAsyncExecutor()
    {
        Executor executor = taskScheduler();
        return executor;
    }

    /*
     * 异步任务 异常处理
     */
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler()
    {
        return new SimpleAsyncUncaughtExceptionHandler();
    }
}

原因是ThreadPoolTaskScheduler没有初始化，

在第45行加上：

scheduler.initialize();

就可以了；

参考：https://stackoverflow.com/questions/41672364/spring-async-threadpooltaskscheduler-not-initialized