org.springframework.core.task.TaskRejectedException

一、问题

"Unexpected error occurred in scheduled task.↵org.springframework.core.task.TaskRejectedException: Executor [java.util.concurrent.ThreadPoolExecutor@41fbf07a[Running, pool size = 40, active threads = 40, queued tasks = 12, completed tasks = 632957]] did not accept task: org.springframework.aop.interceptor.AsyncExecutionInterceptor$$Lambda$729/1676075365@169b451c↵	at org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor.submit(ThreadPoolTaskExecutor.java:344)↵	at org.springframework.aop.interceptor.AsyncExecutionAspectSupport.doSubmit(AsyncExecutionAspectSupport.java:284)↵	at org.springframework.aop.interceptor.AsyncExecutionInterceptor.invoke(AsyncExecutionInterceptor.java:129)↵	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)↵	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)↵	at com.sun.proxy.$Proxy127.saveInAndOutMessage(Unknown Source)↵	at com.ovopark.service.impl.TaskServiceImpl.licencePlateDeviceOffLine(TaskServiceImpl.java:69)↵	at com.ovopark.job.ScheduleJob.plateDeviceOfflineJob(ScheduleJob.java:32)↵	at sun.reflect.GeneratedMethodAccessor807.invoke(Unknown Source)↵	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)↵	at java.lang.reflect.Method.invoke(Method.java:498)↵	at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84)↵	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)↵	at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)↵	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)↵	at java.util.concurrent.FutureTask.run(FutureTask.java:266)↵	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)↵	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)↵	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)↵	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)↵	at java.lang.Thread.run(Thread.java:748)↵Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@58f98d07 rejected from java.util.concurrent.ThreadPoolExecutor@41fbf07a[Running, pool size = 40, active threads = 40, queued tasks = 12, completed tasks = 632957]↵	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063)↵	at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)↵	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379)↵	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)↵	at org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor.submit(ThreadPoolTaskExecutor.java:341)↵	... 20 more"

二、现象

package com.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;

/**
 * 线程池配置类
 *
 * @author
 */
@Configuration
@EnableAsync
public class ThreadPoolConfig {

    @Bean("getExecutor")
    public Executor getExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //设置核心线程数
        executor.setCorePoolSize(5);
        //设置最大线程数
        executor.setMaxPoolSize(40);
        //队列容量
        executor.setQueueCapacity(12);
        //设置线程名
        executor.setThreadNamePrefix("池内异步工作线程---");
        //设置多余线程等待的时间，单位：秒，Default is 60
        executor.setKeepAliveSeconds(10);
        // 初始化线程
        executor.initialize();
        // 设置拒绝策略
        //executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        //executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }
}

三、原因

因为设置了默认拒绝策略AbortPolicy，直接抛出了异常

四、解决办法

package com.config;

import java.util.concurrent.ThreadPoolExecutor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;

/**
 * 线程池配置类
 *
 * @author
 */
@Configuration
@EnableAsync
public class ThreadPoolConfig {

    @Bean("getExecutor")
    public Executor getExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //设置核心线程数
        executor.setCorePoolSize(5);
        //设置最大线程数
        executor.setMaxPoolSize(40);
        //队列容量
        executor.setQueueCapacity(12);
        //设置线程名
        executor.setThreadNamePrefix("async-service-");
        //设置多余线程等待的时间，单位：秒，Default is 60
        executor.setKeepAliveSeconds(10);
        // 初始化线程
        executor.initialize();
        // 设置拒绝策略
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        //executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }
}

四、参考链接

1、面试必备：Java线程池解析