這個錯誤其實是 debug 級別的錯誤，是不影響運行的。
錯誤棧為：
020-10-26 15:27:57.726 DEBUG 12844 --- [nio-8080-exec-1] .s.a.AnnotationAsyncExecutionInterceptor : Could not find unique TaskExecutor bean org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.core.task.TaskExecutor' available: expected single matching bean but found 2: applicationTaskExecutor,taskScheduler at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1200) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveBean(DefaultListableBeanFactory.java:420) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:350) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:343) at org.springframework.aop.interceptor.AsyncExecutionAspectSupport.getDefaultExecutor(AsyncExecutionAspectSupport.java:233) at org.springframework.aop.interceptor.AsyncExecutionInterceptor.getDefaultExecutor(AsyncExecutionInterceptor.java:157) at org.springframework.aop.interceptor.AsyncExecutionAspectSupport.lambda$configure$2(AsyncExecutionAspectSupport.java:119) 原因和解決
簡單來說就是在你的 @Configuration 中必須要實現一個 AsyncConfigurer 來為 @Async 指定一個 TaskExecutor 執行的方法。
package com.insight.sco.service.config; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.AsyncConfigurer; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import org.springframework.stereotype.Component; import java.util.concurrent.Executor; /** * AsyncConfigurer for Spring * * @author YuCheng Hu */ @Configuration @Component @EnableAsync public class TaskExecutorConfig implements AsyncConfigurer{ /** * Override Config * * @return */ @Override public Executor getAsyncExecutor(){ ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor(); taskExecutor.setCorePoolSize(10); taskExecutor.setMaxPoolSize(80); taskExecutor.setQueueCapacity(100); taskExecutor.initialize(); return taskExecutor; } } 可以將上面的方法拷貝放到你 Spring 的項目中，這樣你的 Spring 項目就可以告訴應用的上下文使用哪一個異步方法。
