修改Spring自定义异步线程池的错误_failed to instantiate [java.util.concurrent.execut-优快云博客

本文详细介绍了在Spring框架中配置异步任务执行器的方法，包括核心线程池大小、最大线程数、队列容量等关键参数的设定。同时，文章还分享了解决因implements AsyncConfigurer导致的项目启动错误的经验。

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@EnableAsync
@Configuration
public class AsyncTaskExecutePoolConfig implements AsyncConfigurer {

public static final int CORE_POOL_SIZE = 20;
private static final int MAX_POOL_SIZE = 50;
private static final int QUEUE_CAPACITY = 100;
private static final int KEEP_ALIVE_SECONDS = 30;

@Override
@Bean(name = "asyncExecutor")
public Executor getAsyncExecutor() {
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    //核心线程池大小
    executor.setCorePoolSize(CORE_POOL_SIZE);
    //最大线程数
    executor.setMaxPoolSize(MAX_POOL_SIZE);
    //队列容量
    executor.setQueueCapacity(QUEUE_CAPACITY);
    //活跃时间
    executor.setKeepAliveSeconds(KEEP_ALIVE_SECONDS);
    //设置线程池关闭的时候等待所有任务都完成再继续销毁其他的Bean
    executor.setWaitForTasksToCompleteOnShutdown(true);
    //线程名字前缀
    executor.setThreadNamePrefix("workflow-async-");
    // setRejectedExecutionHandler：当pool已经达到max size的时候，如何处理新任务
    // CallerRunsPolicy：不在新线程中执行任务，而是由调用者所在的线程来执行
    executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
    executor.initialize();
    return executor;
}

2020/7/6下午更新maven包后项目启动报以下错误:
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.util.concurrent.Executor]: Illegal arguments to factory method ‘getAsyncExecutor’; args: ; nested exception is java.lang.IllegalArgumentException: object is not an instance of declaring class

解决:将implements AsyncConfigurer删除后ok