一、问题描述

最近在使用线程池做spring的任务Test时，启动服务抛出异常：Singleton bean creation not allowed while the singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!)

具体的错误信息如下：

java
Exception in thread "pool-3-thread-1" Exception in thread "pool-3-thread-2" org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'jade.datasourceFactory': Singleton bean creation not allowed while the singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:216)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:534)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:523)
    at net.paoding.rose.jade.context.spring.SpringDataSourceFactoryDelegate.getDataSource(SpringDataSourceFactoryDelegate.java:38)
    at net.paoding.rose.jade.dataaccess.DefaultDataAccessFactory.getDataAccess(DefaultDataAccessFactory.java:46)
    at net.paoding.rose.jade.statement.SelectQuerier.execute(SelectQuerier.java:60)
    at net.paoding.rose.jade.statement.SelectQuerier.execute(SelectQuerier.java:56)
    at net.paoding.rose.jade.statement.JdbcStatement.execute(JdbcStatement.java:112)
    at net.paoding.rose.jade.context.JadeInvocationHandler.invoke(JadeInvocationHandler.java:143)
    at com.sun.proxy.$Proxy53.getSapPayDetailList(Unknown Source)
    at com.xiaomi.mifi.scf.accountcenter.service.gateway.SapPayDetailService.getSapPayDetailList(SapPayDetailService.java:45)
    at com.xiaomi.mifi.scf.accountcenter.task.reconcile.SapReconcile.sapPaydetailClean(SapReconcile.java:70)
    at com.xiaomi.mifi.scf.accountcenter.task.reconcile.SapReconcile.lambda$reconcile$0(SapReconcile.java:58)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

二、原因分析

经过原因分析，是单例的bean在创建的时候，容器已经处于销毁阶段，生命周期不同，不允许再次创建生产Bean。为什么会发生这个问题呢？

具体看了代码，是因为我的任务提交给了线程池，test主线程运行时，启动了线程池，线程池中的任务会加载bean，但因为异步原因，任务提交给线程池后，主线程结束了，开始销毁bean容器，而线程池任务有需要创建出bean，所以出现上述的异常情况。

三、解决方案

3.1 测试用例中增加线程池的任务判断，如果有线程池任务未完成，当前主线程阻塞。

java
@Test
public void test2(){
    sapReconcile.reconcile("123",2);
    while (sapReconcile.executor.getActiveCount() > 0){
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

3.2 利用屏障等同步工具，等待线程执行完成后再退出主线程。