一、問題描述

最近在使用線程池做spring的任務(wù)Test時，啟動服務(wù)拋出異常：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!)

具體的錯誤信息如下：

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

經(jīng)過原因分析，是單例的bean在創(chuàng)建的時候，容器已經(jīng)處于銷毀階段，生命周期不同，不允許再次創(chuàng)建生產(chǎn)Bean。為什么會發(fā)生這個問題呢？

具體看了代碼，是因為我的任務(wù)提交給了線程池，

  @Test
    public void testReconcile(){
        sapReconcile.reconcile("123",2);
    }
 public TRResponse reconcile(String taskId, int type) {
        log.info("當(dāng)日對賬處理|taskId:{}, type:{}, startTime:{}", taskId, type, DateUtil.getNowStr());
        List<Long> times = getReconcileTime(type);
        executor.execute(() -> sapPaydetailClean(times.get(0),times.get(1)));
        executor.execute(() -> paydetailClean(times.get(0),times.get(1)));
        log.info("當(dāng)日對賬處理|endTime:{}", DateUtil.getNowStr());
        return new TRResponse().setCode(ResponseCodeEnum.SUCCESS.getCode());
    }

test主線程運行時，啟動了線程池，線程池中的任務(wù)會加載bean，但因為異步原因，任務(wù)提交給線程池后，主線程結(jié)束了，開始銷毀bean容器，而線程池任務(wù)有需要創(chuàng)建出bean，所以出現(xiàn)上述的異常情況。

三、解決方案

3.1 測試用例中增加線程池的任務(wù)判斷，如果有線程池任務(wù)未完成，當(dāng)前主線程阻塞。

 @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，等待線程執(zhí)行完成后再退出主線程。

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